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Author Topic: B'ASS Current Amplifier  (Read 83116 times)
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acg
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« Reply #75 on: April 04, 2016, 12:44:13 pm »

It would be end to end 2x mono, although at this moment I doubt whether this is the best to do. So FYI, you might think this works nicely but it thus assumes no common ground anywhere between the two channels of which you are not going to tell me that this stays separate at the other (poweramp) end. Then what ? I feel this brings misery only and my feelings are often correct.


Peter, I am not exactly sure what you mean here.  In my situation, and I believe in yours as well with the Orelo's, the amplifiers for left channel are completely separate to the amplifiers for the right channel...true monoblocs...although they are in your case 4 amps per side and in my case six.  The only common ground between them is via the main socket into which they are plugged.

Or do you mean that this is setting things up for a nice big ground loop?

Anthony

PS:  Wow...you are already going on the Muses chip!  I feel quite guilty that I have caused all this extra work for you now...and I do apologise...but I also know that you would not be investigating this without consideration of its potential merit.  If you get a good result I think it will probably be a more saleable product especially to those not in the Phasure ecosystem.  Are you thinking of actually having two products if it works out?  For example B'Ass and B'Ass VC.
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« Reply #76 on: April 04, 2016, 01:52:13 pm »

Quote
If you get a good result I think it will probably be a more saleable product

Haha, and this is eactly why you should not mention your situation with the ground, let alone mine !
So yes, for us both it would work, but for others, with one amplifier and shared ground between channels (which 99,99% of cases will be so), the ground loops emerge. Thus the ground loops emerge when at the far distance such a connection point exists (and not when it is not there, although I really must think about the mains as common point as well).

But more easy : Think about your NOS1. That already uses shared signal ground between the channels.

N.b.: I had much more text here, but I scratched it, once realizing that there's a difference between a shared signal gnd and a more "active" process on a PCB ground place. To give an example of two possites about this, both as effective for their merit :

One amplifier, differentially setup, MUST be on the same PCB.
Two amplifiers, for two channels (L/R) should NOT be on the same PCB.

... And because it is so easy to make mistakes, I made the mistake of creating one of the test PCBs at first for differential (balanced) and measuring that situation (see what I described for the Muses "test"), while when I was done with that, I connected that same PCB for L/R (easy enough, just connect different inputs and utilize the outputs differently). So I am listening all this time to a PCB with Left and Right on it. That shouldn't be the best for channel separation ...
The stupid stuff is too flexible !
haha

Anyway, one part of the scratched text was that we have buffer capacitors to not let influence the one channel the other via the PSU. This, while my earlier post writes out the overkill of the PSU in the first place. So I am nicely ignorant here.

Peter
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« Reply #77 on: April 05, 2016, 12:28:38 am »

My NOS1a is driving 8 gain clones from its balanced outputs so the current capacity of the B'ASS would be very welcome [...]

Nick,

In my proto-box there's currently still the switch hanging around that can add ~240mA per channel (I think I mentioned it in between the lines in the first post). So what I planned at some stage, is adding more current by means of, say, two switches (engage them both and the current is double the native). But it did not sound well. Not for me ! But I never thought of a situation like yours, where indeed it would be so that "double the drive" implies double the required current, all else being equal (read : if in my case and one 50K input impedance amp, the ~500mA is the best, then with two amps 1A should be required - well, sort of because the length of the interlink stays the same). So while I ditched the switches, I shouldn't ...

The additionally attached current ("chips") are only switched in the output signal path and I think/claim this is allowed at this higher level (of current). Measurement really shows no difference at flipping the switch (while it thus surely is audible). Side note (or not) : In my situation this additional current sounds chaotic, but this is not because of the switch; it already does with the chip nicely on the PCB like the others. Still, I can't judge the switch for that merit (of "switch").

Anyway ... thinking more inputs and what not it is not so difficult to again think "switches" (in the case). And if I do what I planned, then 2 switches plus electronics supplying the current, will cost 150 more for SE (300 for Balanced). It goes like this :

One switch can serve two "channels" and a channel is regarded one SE channel. Thus, stereo RCA (= SE, Single Ended) requires one double pole switch (think power switch sized) to attach one step of more current; with Balanced, the one switch would attach one functional channel (like the left channel) for both plus and minus of the differential channel. So it requires two switches to attach current for the left and right channel for one step of more current.
Thus two steps require 4 switches.

The switches would be at the outside of the case, reachable at any time without lifting the lid.

Peter


Peter hi,

This is very interesting and sounds like a perfect arrangement for my amp. A line stage with 250 to 500ma + drive potential it must drive the power amps with real authority !

In my setup taking the posertive pole of say the left channel of my amp the posertive side of the nos1a output opamp drives 2 gain clones each with 22k ohm inputs so in parallel these present just 11k ohms to the nos1a op amp. The sound from bridging and bi amping is good but I feel the input arrangement has always been a compromise. I don't really have the confidence to build a buffer for the input as getting a line designs up to the level of the nos's performance would be way too difficult for me.

What you have developed sounds like a brilliant fit. Please put me down for a switchable and balanced version, I would not really need attenuation being discussed.

Regards,

Nick

Ps  I can always use the line stage to do some arc welding when I am not using it to drive the gainclone amps  wacko
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« Reply #78 on: April 05, 2016, 11:34:15 am »

#3 for me please + the hdd with operating systems + short usb cable

Ha !
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« Reply #79 on: April 05, 2016, 11:55:14 am »

Hey, it is not allowed to order more than one thing at the time, or otherwise we get confused over here !

haha

Thank you Leo.

But B'ASS is not ready of course. Must we wait with the RAM OS and short Clairixa ?
Shipping of those is 12 euros (a bit more because UPS, as it is forbidden to use TNT Post to your place Happy Happy).

Best regards,
Peter

PS: Annecdotical : OffTopic
Back at the time we had clock upgrades. Leo wanted that too.
We shipped set #1 by TNT Post.
It did not arrive.
We shipped set #2 with the thought that this wouldn't go wrong a second time and again it was not insured.
It did not arrive.
Then I thought to explicitly insure it for 500 (IIRC the upgrade was 120 or so ?);
Now we hoped that it would not arrive and claim 500 so we could have a nice dinner together (3x 120 is 360, so ...).
It did not arrive.
Ha !
Leo then collected the upgrade himself.
I claimed the 500 and receive that indeed (after a 100 emails, but alas).
The dinner, though, never happened.
evil
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Removed Switching Supplies from everywhere (also from the PC).

For a general PC :
W10-10586.0 - May 2016 (2.05+)
*XXHighEnd PC -> I7 3930k with Hyperthreading On (12 cores)* @~500MHz, 16GB, Windows 10 Pro 64 bit build 10586.0 from RAM, music on LAN / Engine#4 Adaptive Mode / Q1/-/3/4/5 = 14/-/1/1/1 / Q1Factor = 1 / Dev.Buffer = 4096 / ClockRes = 1ms / Memory = Straight Contiguous / Include Garbage Collect / SFS = 0.10  (max 60) / not Invert / Phase Alignment Off / Playerprio = Low / ThreadPrio = Realtime / Scheme = Core 3-5 / Not Switch Processors during Playback = Off/ Playback Drive none (see OS from RAM) / UnAttended (Just Start) / Always Copy to XX Drive (see OS from RAM) / All Services Off / Keep LAN - Not Persist / WallPaper On / OSD On / Running Time Off / Minimize OS / XTweaks : Balanced Load = *43* / Nervous Rate = 1 / Cool when Idle = 1 / Provide Stable Power = 1 / Utilize Cores always = 1 / Time Performance Index = *Optimal* / Time Stability = *Stable* / Custom Filter *Low* 705600 / -> USB3 *from MoBo* -> Clairixa USB 15cm -> Intona Isolator -> Clairixa USB 1m80 -> 24/768 Phasure NOS1a 75B (BNC Out) async USB DAC, Driver v1.0.4b (4ms) -> Blaxius BNC interlink *-> B'ASS Current Amplifier /w Level4 -> Blaxius Interlink* -> Orelo MKII Active Open Baffle Horn Speakers.
Removed Switching Supplies from everywhere.

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« Reply #80 on: April 05, 2016, 12:25:17 pm »

Please send the harddisk and usb cable first. But do insure them, I still see the same delivery persons around....

If we keep this up it could turn out to become a really great & expensive dinner after a while Happy
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« Reply #81 on: April 05, 2016, 12:55:09 pm »

So you're suggesting that I again use TNT Post, but insure it for 500 again.
I better make two separate packages of it !! clapping
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For the Stealth LPS PC :
W10-14393.0 - November 13, 2017 (2.09)
XXHighEnd Mach II Stealth LPS PC -> Xeon E5 2640v4 with Hyperthreading On (20 cores) @~720MHz, 32GB, Windows 10 Pro 64 bit build 14393.0 from RAM, music on LAN / Engine#4 Adaptive Mode / Q1/-/3/4/5 = *30*/-/*1*/*1*/*1*/ Q1Factor = *40* / Dev.Buffer = 4096 / ClockRes = *15ms* / Memory = Straight Contiguous / Include Garbage Collect / SFS = *0.90*  (max 120) / not Invert / Phase Alignment Off / Playerprio = Low / ThreadPrio = Realtime / Scheme = Core 3-5 / Not Switch Processors during Playback = Off/ Playback Drive none (see OS from RAM) / UnAttended (Just Start) / Always Copy to XX Drive (see OS from RAM) / Stop Desktop, Remaining, WASAPI and W10 services / Use Remote Desktop / Keep LAN - Not Persist / WallPaper On / *OSD Off* / Running Time Off / Minimize OS / XTweaks : Balanced Load = 43 / Nervous Rate = 100 / Cool when Idle = n.a / Provide Stable Power = 0 / Utilize Cores always = 1 / Time Performance Index = Optimal / Time Stability = Stable / *Custom Filtering Highest for 705600* / Always Clear Proxy before Playbck = On -> USB3 from MoBo -> Lush USB 1m00 -> Phisolator 24/768 Phasure NOS1a/G3 75B (BNC Out) async USB DAC, Driver v1.0.4b (*8ms*) -> B'ASS Current Amplifier -> Blaxius Interlink -> Orelo MKII Active Open Baffle Horn Speakers.
Removed Switching Supplies from everywhere (also from the PC).

For a general PC :
W10-10586.0 - May 2016 (2.05+)
*XXHighEnd PC -> I7 3930k with Hyperthreading On (12 cores)* @~500MHz, 16GB, Windows 10 Pro 64 bit build 10586.0 from RAM, music on LAN / Engine#4 Adaptive Mode / Q1/-/3/4/5 = 14/-/1/1/1 / Q1Factor = 1 / Dev.Buffer = 4096 / ClockRes = 1ms / Memory = Straight Contiguous / Include Garbage Collect / SFS = 0.10  (max 60) / not Invert / Phase Alignment Off / Playerprio = Low / ThreadPrio = Realtime / Scheme = Core 3-5 / Not Switch Processors during Playback = Off/ Playback Drive none (see OS from RAM) / UnAttended (Just Start) / Always Copy to XX Drive (see OS from RAM) / All Services Off / Keep LAN - Not Persist / WallPaper On / OSD On / Running Time Off / Minimize OS / XTweaks : Balanced Load = *43* / Nervous Rate = 1 / Cool when Idle = 1 / Provide Stable Power = 1 / Utilize Cores always = 1 / Time Performance Index = *Optimal* / Time Stability = *Stable* / Custom Filter *Low* 705600 / -> USB3 *from MoBo* -> Clairixa USB 15cm -> Intona Isolator -> Clairixa USB 1m80 -> 24/768 Phasure NOS1a 75B (BNC Out) async USB DAC, Driver v1.0.4b (4ms) -> Blaxius BNC interlink *-> B'ASS Current Amplifier /w Level4 -> Blaxius Interlink* -> Orelo MKII Active Open Baffle Horn Speakers.
Removed Switching Supplies from everywhere.

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« Reply #82 on: April 06, 2016, 05:02:15 am »

Peter,

Wow.  I've been off the forum for less than a week and come back to this. Please sign me up for 1 of #3 (BNC stereo) along with the short Blaxius cable needed.

Can I confirm this is what I need for current and future setup. 

Current: NOS 1a with psuedo Blaxius (RCA output using Blaxius cable with adapters on both ends) going to RCA inputs on Linkwitz ASP.  Input impedance of the ASP is 10K ohms, and output impedance 196 ohms (not sure if that matters).  The B'ASS would be between the DAC and ASP and I would use BNC to RCA adapters on all Blaxius cables.

Future: Upgrade to NOS 1a 75B (I have the kit) and go direct from DAC to Orelo BNC input, with B'ASS in between.

Ramesh
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« Reply #83 on: April 06, 2016, 08:58:37 am »

Hi Ramesh,

Yes, that is all fine.

Regards and thanks !
Peter
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For the Stealth LPS PC :
W10-14393.0 - November 13, 2017 (2.09)
XXHighEnd Mach II Stealth LPS PC -> Xeon E5 2640v4 with Hyperthreading On (20 cores) @~720MHz, 32GB, Windows 10 Pro 64 bit build 14393.0 from RAM, music on LAN / Engine#4 Adaptive Mode / Q1/-/3/4/5 = *30*/-/*1*/*1*/*1*/ Q1Factor = *40* / Dev.Buffer = 4096 / ClockRes = *15ms* / Memory = Straight Contiguous / Include Garbage Collect / SFS = *0.90*  (max 120) / not Invert / Phase Alignment Off / Playerprio = Low / ThreadPrio = Realtime / Scheme = Core 3-5 / Not Switch Processors during Playback = Off/ Playback Drive none (see OS from RAM) / UnAttended (Just Start) / Always Copy to XX Drive (see OS from RAM) / Stop Desktop, Remaining, WASAPI and W10 services / Use Remote Desktop / Keep LAN - Not Persist / WallPaper On / *OSD Off* / Running Time Off / Minimize OS / XTweaks : Balanced Load = 43 / Nervous Rate = 100 / Cool when Idle = n.a / Provide Stable Power = 0 / Utilize Cores always = 1 / Time Performance Index = Optimal / Time Stability = Stable / *Custom Filtering Highest for 705600* / Always Clear Proxy before Playbck = On -> USB3 from MoBo -> Lush USB 1m00 -> Phisolator 24/768 Phasure NOS1a/G3 75B (BNC Out) async USB DAC, Driver v1.0.4b (*8ms*) -> B'ASS Current Amplifier -> Blaxius Interlink -> Orelo MKII Active Open Baffle Horn Speakers.
Removed Switching Supplies from everywhere (also from the PC).

For a general PC :
W10-10586.0 - May 2016 (2.05+)
*XXHighEnd PC -> I7 3930k with Hyperthreading On (12 cores)* @~500MHz, 16GB, Windows 10 Pro 64 bit build 10586.0 from RAM, music on LAN / Engine#4 Adaptive Mode / Q1/-/3/4/5 = 14/-/1/1/1 / Q1Factor = 1 / Dev.Buffer = 4096 / ClockRes = 1ms / Memory = Straight Contiguous / Include Garbage Collect / SFS = 0.10  (max 60) / not Invert / Phase Alignment Off / Playerprio = Low / ThreadPrio = Realtime / Scheme = Core 3-5 / Not Switch Processors during Playback = Off/ Playback Drive none (see OS from RAM) / UnAttended (Just Start) / Always Copy to XX Drive (see OS from RAM) / All Services Off / Keep LAN - Not Persist / WallPaper On / OSD On / Running Time Off / Minimize OS / XTweaks : Balanced Load = *43* / Nervous Rate = 1 / Cool when Idle = 1 / Provide Stable Power = 1 / Utilize Cores always = 1 / Time Performance Index = *Optimal* / Time Stability = *Stable* / Custom Filter *Low* 705600 / -> USB3 *from MoBo* -> Clairixa USB 15cm -> Intona Isolator -> Clairixa USB 1m80 -> 24/768 Phasure NOS1a 75B (BNC Out) async USB DAC, Driver v1.0.4b (4ms) -> Blaxius BNC interlink *-> B'ASS Current Amplifier /w Level4 -> Blaxius Interlink* -> Orelo MKII Active Open Baffle Horn Speakers.
Removed Switching Supplies from everywhere.

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« Reply #84 on: April 07, 2016, 10:19:55 am »

In my setup the Nos1a has balanced BNC outputs to the balanced power amps, so 2 BNC's/Blaxius's per channel.

How will the B'ASS look like (and cost) in my situation?

Hey Stanley,

Yes, you are an exception I did not think about. And aplogies, because you actually have the best connection of all of us !

This is what I added to the original post about it :

4.
With 2x BNC-In and 2x BNC-Out. Balanced Stereo B'ASS. Output Impedance 2x 75 Ohms.
Including Headphone output stereo jack (Single Ended). Output Impedance 2.9 Ohms.
920 euros.

The price follows from the difference between RCA and normal BNC (130 euros) with the notice that I grant this situation actually 1 pair of Blaxius for free (not completely true, but anyway think of 2 pair of Blaxius for now 130 euros).
Happy to do this for you (but no obligations from your side of course).

Best regards,
Peter

Hi Peter,

Thanks for making option 4. available (Balanced Stereo B'ASS).

I reread the posts of this topic to try to explain the B’ASS principle to an audio friend. It may be my lack of understanding amplification, but I don't get a clear picture of what the B'ASS does.

Excuse me for asking, but could you, in short, explain what the B’ASS exactly does to the signal arriving from the NOS1 and why the amplifiers (and subsequently the sound from the speakers) benefit from the B’ASS?

This also helps finding budget  evil

Thanks.

Regards,
Stanley
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michaeljeger
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« Reply #85 on: April 07, 2016, 08:35:37 pm »

Same situation here.
There is so much text in Peters first post, I do not really understand what this is all about.
The only thing I understand this far that some kind of SQ improvement seems to be involved.
But why would you improve SQ if you put a device between the Phasure and the Amp, in my case the headphone amp.

By the way, I use a symmetric/balanced HF-Amp since the Abyss headphone should be driven symmetric.
The amp required to drive the Abyss to its best should deliver at least 2.5 Watts better 5W at 50 Ohms impedance.

Regards, Michael
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« Reply #86 on: April 08, 2016, 11:22:21 am »

I reread the posts of this topic to try to explain the B’ASS principle to an audio friend.
[...]
Excuse me for asking, but could you, in short, explain what the B’ASS exactly does to the signal arriving from the NOS1 and why the amplifiers [...] benefit from the B’ASS?

Never try to explain anything to a friend, as this is audio; audio (at least "ours") lives by means of empirical finding with a good electrical setup as a base. Next, in my view, empirical findings should be able to be justified.
This is explicitly NOT :
I can clearly see distortion on an analyser, but hey, it sounds better !
Not Not NOT. But ten to one that any regular audio friend will claim the above. Maybe there isn't even anyone on this globe who is 100% sure that the least distortion will bring the very best sound, despite it sounds as logical as it is ...
Except for me of course.

The above actually tells half of the story because when we measure all to be "100%", there's a whole galaxy beyond what measures "best" but may sound like sh*t and what measures as "best" but sounds very good. Besides that, what is good today is sh*t next year.

That told it all.

swoon

Try to explain to random friends or people or even electrical engineers why an interlink which is capable of 6GHz of frequency over a length of 160 meters, sounds better than an e.g. 1MHz capable cable which won't do that any more at a length of 20 meters. In case the audience does not know that we tend to hear not beyond 20KHz, be sure to obfuscate that into 60KHz because of the crazies who are sure to hear that 60KHz sounds better to them, because it is in the material.
Now wait for the response.

FYI : I would not be able to fight that response either, while they will imply that I am crazy. Okay, you are, because you came up with the story, but you can always blame me for it.
... Which doesn't mean you were able to explain it ...

Of course I am making fun a little about that friend, but the story won't change because you are now my friend and I am the story teller. And that in poor English.



No amplifier is going to benefit from any B'ASS "driver" (let alone the speakers). It is the signal (towards the amplifier) which is improving;

Sadly I have no pictures of the situation, but when the "load" is too high (which means the resistance too low between signal and ground), then think like the current flowing because of that is going to influence the outgoing signal. Think like it can't flow freely any more and that a normally nice sine is going to exhibit harmonics. It could look like this, with the notice that the first picture is the reference, while the second is compromised because of too much current flowing, that not being suffciently under control :




Also notice that this is a "showcase" of what happens, and not the real situation (I just don't have picture of that, but I know the exhibit is the same).

If you look closely, you see that the 3rd (at 3000Hz), 4th and 5th harmonic not only have risen, but also are of equal height;
Compromise this signal even more, and the 2nd harmonic will also rise, a 6th will emerge of again equal height like the others and the THD figure will again be worse.

On a side note, see that the 2nd marmonic in the first picture is ~103dB down (and not ~91 as it seems). This is because the output is +12V (91 + 12 = 103).

You are used to these figures, because from the NOS1 (which is not what you see here) this is about the same (a little bit better). So what is the difference ? what you look at here is connected to an input impedane of (IIRC) 6.8 Ohms, while your power amplifier will normally have an input impedance of 47000 Ohms (or much higher).
Might you connect your NOS1(a) to such a low Impedance, you will have a virtual melt down because nothing can deal with the current flowing (wanting to flow because of this low "resistance" implied between the output wires, but that current not being available).

Still there ?
I ask, because I can see that you wonder how this is all related to the actual question ...

Supposed we act like the real audiofool, then we possibly would say that the first picture is sufficiently good enough for good sound;
I told it was the reference, but ... notice that I only said that because I can't make it better anyway. Oh, in this case I theoretically could, but do notice that the anlyser won't show better than 0.00073%, so whatever I might improve beyond that, will not be made visible by the analyser.
But does it mean that we can't improve further ?

Of course we can. But small problem : we must do it in the blind. We must start to work with theories only. Or better and back to the beginning of this post : we will now live by empirical finding, try to reason out the parameters involved and how, and proceed with that. Does it work out for the better ? then we continue that route. We do, until it stops (say, collapses). Small danger in this case : all by my ears, once we are operating beyond the analyser limits.

So remember ? Our 6GHz interlink sounds better, even at 2 meters of lenght than any audio voodoo interlink around. With no single means I could proove the difference, and the impedance - or reflection - or whatever vector (network) analyser I lack, so we have to believe in the rubbish. But don't tell there wasn't a strategy behind the Blaxius ! Same thing with Clairixa and same thing with now B'ASS;

It will be a repeat of an earlier post, but the capacity (as in capability) of the setup is causing the better sound. Thus, even with the 47000 Ohm input impedance at the other side and the "no current flowing at all", allowing for the higher current improves anyway. In the end it will spring from the same phenomenon as why the Blaxius improves so vastly, because what did that do ? ... it combines the very low capacitance with ultra high frequency capabilities into something which is well beyond what was there in the first place : something like 20 meters for 20KHz at the current which is present. Notice that varying ("improving") the parameters of the cable, does extend the length of the cable, but of course it still requires the current to drive it (so now we have two angles of current). But, this is non-sense because we are not lengthening the interlinks at all; All we do is making that theoretically possible, which has to imply that it even will be better at the short length BUT of which everybody says it is idiot to begin with (but read : at the short lenght the cable for sure can do 6GHz already).

It is for a good reason that right from the start (of this topic) I talked in terms of overkill. This is because it is exactly that, and it means that no math tells us (or at least me) that what we do here could be required or even help. Still the phenomenon of overkill in general, does help. It is only that we don't know how it works and that foremost is because we can't measure any more beyond the limits in order, which limits we already reached long ago.

In general terms we could say that I added a buffer where a buffer is not required (and there is math for that, so this is how we know).

The amp required to drive the Abyss to its best should deliver at least 2.5 Watts better 5W at 50 Ohms impedance.

Remember, P = U x I. From that follows that I = P / U. Thus :
For 2VRMS :
I = 2.5 / 5.6 = 0.446A.
or if 5W is better :
I = 5 / 5.6 = 0.983A.
This, while 500mA is at your service. This implies that sort of like the "Nick" situation, you'd need twice the current from the standard, which can just be applied.

But tell me, why would 5W be better than 2.5W while 2.5W is fine ?
IOW, you could ask your question to Abyss too. Maybe they have a similar answer, maybe they claim voodoo and maybe they say that you now can play 6dB louder.

Quote
But why would you improve SQ if you put a device between the Phasure and the Amp, in my case the headphone amp.

Well, according the principle as applied with the power amp, this should work out the same, although I'd readily agree it would be stupid to do. So there's one real solution to this only : leave out the headphone amp (why ? because B'ASS *is* a headphone amp already).
But my real advice in your case, Michael ? leave it be; it would be a typical situation that I really wouldn't know the outcome in advance and only if you have measurement figures of your amp and they show worse, it would be worth a try. And oh, I tried to find figures/graphs myself of your amp but I failed on it. Maybe one I found but I don't trust that (but doesn't look to good to me at all (for figures)).
Btw, that your headphone requires a balanced input, only implies a connector which provides that (plus some wires).

I am sure it all doesn't make it really clear, but I tried.

Best regards,
Peter
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« Reply #87 on: April 08, 2016, 12:11:44 pm »

Regarding the theoretical 3 input VC B'ASS, just clarifying something.

Input 1 could be BNC - Direct
Input 2 could be BNC - VC
Input 3 could be RCA - VC

Output could be BNC

Correct?

That would cover a lot of scenarios for myself...

So the B'ASS provides more current.  You mention if it adds too much, the sound can actually degrade.  My question is whether the "ideal amount" changes depending on the input impedance of the users amp.

For example, it sounds like your (Peters) amps have 47K ohm input impedance.  My current amps are a little lower, around 20K input impedance.  Would I possibly need to "flip the switch" for double the current?

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« Reply #88 on: April 08, 2016, 01:34:54 pm »


So the B'ASS provides more current.  You mention if it adds too much, the sound can actually degrade.  My question is whether the "ideal amount" changes depending on the input impedance of the users amp.

For example, it sounds like your (Peters) amps have 47K ohm input impedance.  My current amps are a little lower, around 20K input impedance.  Would I possibly need to "flip the switch" for double the current?

Matt

Excellent question.  In my situation the B'ass will be driving 6 channel valve amplifiers with passive line level crossovers in front, so really it will be driving the electronic filters which I imagine will be quite a variable impedance load for the B'ass perhaps as low as 5k.
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« Reply #89 on: April 09, 2016, 11:12:14 am »

Peter

I do not know really why the juice is needed for the Abyss. The consensus seems to be that the more juice the more effortless it can reproduce. At least that is what the manufacturer said.

Regarding the BASS.... can you build it with a balanced Headphone output? For the HIFI headphone community, this is pretty much standard these days.

Regards, Michael
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