Industrial AlephX High Power version

[Bernhard]

Originally posted by Netlist
maybe I sell those transformers, and bye other ones. The trouble is that these ones are 1000VA and the 18-0-18 I can bye are only 750VA.
Or I change the caps.
/Hugo

Netlist,

looks very nice.

If you really want to sell the transformers one day, I might be interested.

I have two 18-0-18V with 110V primaries in series, that feed my high power monolytic susy amp, they give me something like 25,5V, but idle current is only 100mA.

They are 95mm in diameter and 55mmhigh and from that I think they are 600W each.

Nelson recommends 25V rails as a minimum.
So I believe, if you use 18V transformers together with fat idle currents, it will be lower...

20V would be good ? Difficult to buy

You can find caps @ http://listings.ebay.de/aw/plistings...069/index.html

What about the sound compared to the monolytic susy ?

You know, because of my quadruple amping I need 8 channels and can not afford the aleph(X) heat.


I also believe, You get double localisation because of a wall-mirrored sound

Also from the floor...

Originally posted by cocolino

Another thing I would change is placement of the speakers!
They are far too near the wall on the side.

cocolino,

what would you suggest as a optimum ? As much as possible ?

[grataku]

Originally posted by Netlist

Could you give me your bank account?

/Hugo

If you give me your B&W...

[Netlist]

Bernhard,
Great offer, but I'm afraid those trannies will be too small.
As the amp consumes so much power, and I want to stay in the safe area...but Nelsons comment on this would be appreciated.
Thanks for the link; maybe I find other caps there. I never take decisions too fast, we will see.

About the sound:
I didn't have the time to connect them to my 'big' ones, but with the speakers I normally test and know very well, the sound is impressive. I never heard my speakers play like they play with the AlephX.
There is no way to compare the sound with the monolithic amp.
That doesn't mean I'm fully satisfied. I think there is still a lot to improve.
The bass is absolutely stunning. You know, I'm always careful with 'impressive' sound.
I guess I need more time to be able to say if I like it or not.
Last year October I was at a Hi-End show in the Netherlands.
The Philips guys gave a demo of their SACD with a 5.1 surround system.
They used all B&W Nautilus 800's and each speaker was powered with a Pass-amp (don't know which one). (Yes it was hot in there).
Now, this was not impressive, but breathtaking.

What do you mean about that wall-mirrored sound? Is it about my speakers to close to the wall?
/Hugo

[Bernhard]

Originally posted by Netlist

There is no way to compare the sound with the monolithic amp.


What do you mean about that wall-mirrored sound? Is it about my speakers to close to the wall?
/Hugo

Does that mean, the Aleph-X are much/little/? better ?

Is it only the bass or also the mids / highs ?

If it is only the bass, maybe the damping is better because of the parallel output fets

Hey, if you like breathtaking, you could try building plasmas

Yes, if you are too close to the wall you get a second mirrored-on-the-wall sound source which has little time delay to the speakers and might confuse imaging.

[Netlist]

Originally posted by Bernhard

Does that mean, the Aleph-X are much/little/? better ?

The AlephX should be much better IMHO.
The sound is not comparable with any amp I ever heard.
I repair lots of amps, the Crown K2 is one of my favourites on a big PA-system. (Not that I ever repaired a K2, I send them to the service centre when they come in)
But the sound of AlephX is warmer, balder, deeper then what I heard till now trough my speakers, which doesn't mean better. The bass is very much pronounced. That's why I can't tell you a lot about mid and high. Have to get used to it.
I ones had a Technics class A amp, a big one, who was also sounding extremely detailed and was till now the best consumer amp I heard.
Of course I still listen to the mono version and have a long way to go with listening sessions of AlepX.

A few "experts in sound" where invited in the past to listen to the B&W's in the living room. None of them was able to place the speakers in a good position and they all had their own theories. As I said, the room is nice, but not good for sound. Still, these speakers sound REEEAL good.
/Hugo

[Peter Daniel]

Originally posted by Netlist

Still, these speakers sound REEEAL good.

They look real good too, a perfect match for industrial amp. And all this in Belgium, a place where industrial music comes from

[cocolino]

originally posted by Netlist
I had (and still have) a problem with the power supply. The caps I bought are rated 25V. The power transformer is 22-0-22 and after the bridge and caps I get 28V under load. That’s why I had to mount two series resistors after the rectifier. They spoil a huge amount of heat and mounted together with the rectifier on the alu plate, it gets too hot.

Yes, that power supply...maybe I sell those transformers, and bye other ones. The trouble is that these ones are 1000VA and the 18-0-18 I can bye are only 750VA.
Or I change the caps. Or find something else. Still don't know.

Why not buy 4 pieces 750VA trafos (2 each to replace one 1000VA) 0-18V and to use a double bridge rectifier (if You don`t have this anyway)?
And BTW: I might be interested in the caps when You decide to change them (depending of brand, type, value & last not least price) and maybe the trannies too

originally posted by Bernhard
Nelson recommends 25V rails as a minimum.
So I believe, if you use 18V transformers together with fat idle currents, it will be lower...

20V would be good ? Difficult to buy

When You just need a different secundary voltage (and not a completly individual transformer design regarding core, size, power-rating etc.), for still reasonable money (estimated 10 to 15 Euro per transformer) You can often have transformers windings custom made - even when You need only a pair of them.
Just ask at the factory - You`ll be surprised what`s all possible.

originally posted by Bernhard
cocolino,
what would you suggest as a optimum ? As much as possible ?

It`s very difficult to suggest an "optimum" without knowing more about that particular room. "As much as possible" is not very practical unless You prefer listening in the garden. I guess something around 0,7m to 1,2m would do it in most cases and for most speaker (of course that`s only a very rough estimation - it all depends about the rest of the room, the absolute placement in the room, the speaker horizontal radiation pattern ....etc.).

I understand that WAF more often than not is the biggest obstacle here and it`s really a pity because this is what can make a big difference in performance - likely much bigger than changing from a good amp to "the best" ones.

WAF - or the prevention of really good audio

[Bernhard]

Originally posted by Netlist


The AlephX should be much better IMHO.
The sound is not comparable with any amp I ever heard.
But the sound of AlephX is warmer, balder, deeper then what I heard till now trough my speakers, which doesn't mean better. The bass is very much pronounced. That's why I can't tell you a lot about mid and high. Have to get used to it.
A few "experts in sound" where invited in the past to listen to the B&W's in the living room. None of them was able to place the speakers in a good position and they all had their own theories. As I said, the room is nice, but not good for sound. Still, these speakers sound REEEAL good.
/Hugo

I don't know.

If the sound is warm, is it still neutral ?

Or is there something added ?


Bald floors and walls reflect higher frequencies,starting from 1 kHz like a mirror input angle is output angle.

Make a test.

Take a big large book with a shining paper envelope, hold it beside your head vertically and turn it on the y-axis.
In a 45° angle you can hear the high frequencies coming from your book

Or exchange the book for a mirror. When you can see the speakers in the mirror, it reflects the sound to your ears - exactly: to your eyes.

You have hard direct reflections from the close floor and wall that disturb localisation.

[Netlist]

All those tips... I can't believe my eyes and ears. Thanks guys, I'll have a look at them tomorrow.

/Hugo - AUDIO - or the prevention of really good W(A)IF(E)

[cocolino]

AUDIO - or the prevention of really good W(A)IF(E)

If she can`t stand it, she can`t be really good