(x) (x) = N_p - Page 2 - diyAudio
Go Back   Home > Forums > Amplifiers > Pass Labs

Pass Labs This forum is dedicated to Pass Labs discussion.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 5th June 2003, 04:53 PM   #11
Netlist is offline Netlist  Belgium
diyAudio Moderator Emeritus
 
Netlist's Avatar
 
Join Date: Jan 2003
It's always a pleasure to hear happy people freak out!
Pics will be needed soon… very soon. We hardly can wait to see that babe.

/Hugo
  Reply With Quote
Old 5th June 2003, 05:30 PM   #12
diyAudio Moderator Emeritus
 
roddyama's Avatar
 
Join Date: Jan 2002
Location: Michigan
Hi Ian,

Super job on the JBL's. They look fantastic.

Can't wait to see some more amp pics.

I love your discription of the bass reproduction. The deep bass should be felt and not heard.

Rodd Yamashita
  Reply With Quote
Old 5th June 2003, 05:38 PM   #13
grataku is offline grataku  United States
diyAudio Member
 
Join Date: Dec 2000
Location: -


What's the point of using these ridiculously low rails and insanely high currents to get a few dirty watts, as it turns out by actual measurements? Double THD when going from 12 to 15 v rails, as I recall.
-Do you have speakers with 1 ohm impedance that you need to circulate 10 amps per channel?
-Do you plan to double your amp for use as an arc welding station?
For the power you are going to be able to get out this circuit you can, even by very conservative standards, use one mosfet per side, it cuts down on the mosfet capacitance, if you want to get even fancier you can use a high transconductance mosftet like the 044 that should sound better ( in principle).
I had the same criticism for the x-zenlight with 12v rails. The high currents put a much higher demand on the PS in terms of handling the ripple, heating on the rectifiers, transformer impedance and on and on and on.

free your mind
  Reply With Quote
Old 5th June 2003, 05:42 PM   #14
grataku is offline grataku  United States
diyAudio Member
 
Join Date: Dec 2000
Location: -
Macka,
I respectfully bow to your speakers
  Reply With Quote
Old 5th June 2003, 06:16 PM   #15
diyAudio Member
 
nobody special's Avatar
 
Join Date: Oct 2002
Location: USA
Quote:
I had the same criticism for the x-zenlight with 12v rails. The high currents put a much higher demand on the PS in terms of handling the ripple, heating on the rectifiers, transformer impedance and on and on and on.

Yeah, but you're still completely wrong on that one! The high currents needed are for even a 6 ohm load without current limiting... which most 8 ohm speaker get down to.
Simulate it or build it and see for yourself!
Free YOUR mind.
The aleph sources in the X make a big difference. I am actually planning on using 1 device/side in my AlephX, because of everything you mentioned. No need for more. If I were going to be using these with my 4 ohm MTMs, however, I would up the current to be on the safe side. Why limit the output capability when you have the voltage headroom (especially when you are talking about a low powered amp... it would be different if you had a clean 100 watts into 8 or 4 ohms). It all depends on your speakers.
Steve
__________________
Steve
  Reply With Quote
Old 5th June 2003, 06:26 PM   #16
MikeW is offline MikeW  United States
diyAudio Member
 
MikeW's Avatar
 
Join Date: Sep 2002
Location: North of Boston
It sounds better when you put more current through it.
I ran my X at 10 amps a side for a while. It sounded great but I had to keep resetting the breaker when I turned the microwave on.
__________________
MikeW
  Reply With Quote
Old 5th June 2003, 06:29 PM   #17
diyAudio Member
 
Join Date: Jun 2002
Location: Italy
Quote:
Originally posted by macka
Some subjective view before the neighbours crack it,

The A Aleph appears to hightlight tranisents very well,

Any percussive sounds...Caroline's drum kit...its so real you can fell the snap of the snare, the crack of the kick.... its in the room surrrrrrrrrrrreal.

And Where are those 18 inch woofers.........they disppeared...the distinction between felt and heard bass is like a tremor and shock wave.

The the harder I push the better she performs without effort.

Ian '

Hey macka , what a view!

The thing that more of all impressed me is the complete coherence of the musical articulation: I play(back) the accordion on some of my favourite titles and it seems to be there together with the players in the room

.... but I'm for more voltage rails than +-15v.

  Reply With Quote
Old 5th June 2003, 10:03 PM   #18
diyAudio Member
 
macka's Avatar
 
Join Date: Dec 2001
Location: Australia
O'kay,

Seriously it is fun, but it ain't no woman . (I'm am getting the odd jealous email from a woman somewhere in the USA so I better cool it) Muhhahahahahahh

The box will be made tomorrow.

I am already thinking about retro Aleph 2, but that will mean a few more comparisons.

Ian
  Reply With Quote
Old 6th June 2003, 02:11 AM   #19
grataku is offline grataku  United States
diyAudio Member
 
Join Date: Dec 2000
Location: -
Quote:
Originally posted by nobody special


Yeah, but you're still completely wrong on that one! The high currents needed are for even a 6 ohm load without current limiting... which most 8 ohm speaker get down to.
Simulate it or build it and see for yourself!
Free YOUR mind.
The aleph sources in the X make a big difference. I am actually planning on using 1 device/side in my AlephX, because of everything you mentioned. No need for more. If I were going to be using these with my 4 ohm MTMs, however, I would up the current to be on the safe side. Why limit the output capability when you have the voltage headroom (especially when you are talking about a low powered amp... it would be different if you had a clean 100 watts into 8 or 4 ohms). It all depends on your speakers.
Steve
Dude, do you really need 10 amps at 13v to get 20 tiny watts? I don't want to get into another argument about sims vs actual circuit but to put it in prospective, Nelson biases his xa200 at 8 amps with 30volts rails.
  Reply With Quote
Old 6th June 2003, 02:46 AM   #20
diyAudio Member
 
Join Date: Mar 2002
Location: Daly City California USA
Hi! Ian how does this amp compare with your'e Aleph two.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



New To Site? Need Help?

All times are GMT. The time now is 07:50 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2