aleph 1.2

back · 8th August 2007, 03:03 PM

i have a pair of infinity renaissance 90 and i wonder if the aleph 1.2 can drive them.

i now it is an amp killer but aleph seems to be a monster.

anybody tried that combination?

daly41k · 12th August 2007, 05:10 PM

hi, I built the Aleph 1.2's back in 2000 and they have been very reliable driving any type of speaker--even Maggie 3.6's. They are now driving my Watkins WE-1's which are supposed to be 8 ohm speakers but need a lot of current for their accoustic suspension bass - 2-8" woofers and 1-8" sub. I also used them with Mirage OM-5's and they did really well with them since the MIrages have a built in powered sub. I am converting them to XA100's for a bi-amp line array that I constructed. I am using the Pass/Tharagard A-75 amp to dirve my Watkins now and the difference is that The A-75 has a touch more bass impact but it is hard for me to hear anyother differences. You will like the Aleph's especially if your speaker has a treble rise. good luck, dave

Nelson Pass · 12th August 2007, 09:23 PM

The A75 is probably more suitable due to the low impedance
of most Infinitiy woofers.

jupiterjune · 13th August 2007, 11:22 PM

Quote:

I am converting them to XA100's

XA100's or X100's??? If it is the XA100, please feel free to post a circuit diagram.....

(unless Nelson would frown on that, of course.)

JJ

back · 15th August 2007, 09:04 AM

thanks for your suggestions.

the a75 is a class A or class A/AB design?

do i need to bias it with class A down to 1ohm?

daly41k · 15th August 2007, 01:41 PM

The A75 is a class A design that apperared in AudioXpress in 1992/1993 and was authored by NP and Norm Tharagard. You can buy the boards from Audoxpress by going to their website.
This was a great design using mosfets from start to finish and has a regulated driver board. This amp design was published during the same time frame that the Aleph design was commercially produced by NP. It is a rugged and reliable amp that can drive anything. You might want to look up the articles on the web site.

daly41k · 15th August 2007, 01:43 PM

Jupiterjune--You can find the schematic for the xa100 that we are using on the GL thread called XA100. I also have a thread called Aleph 1.2 to XA100. dave

gl · 15th August 2007, 04:16 PM

Point of clarification: XA100 = Pass Labs commercial product. AX100 = gl's 100W version of the Aleph-X.

Graeme

Stefanoo · 16th August 2007, 09:36 AM

If i recall correctly, Nelson has told once that the AX (the Class A version of the Aleph X) was very close to the original factory design, correct?

Anyways....has anybody here ever had the opportunity to compare the "forum version" with the factory release?

Is so, would it be possible to share the listening impressions?

8th August 2007, 03:03 PM	#1
back diyAudio Member Join Date: Nov 2005 Location: crete	aleph 1.2 i have a pair of infinity renaissance 90 and i wonder if the aleph 1.2 can drive them. i now it is an amp killer but aleph seems to be a monster. anybody tried that combination?

12th August 2007, 05:10 PM	#2
daly41k diyAudio Member Join Date: Feb 2007 Location: Phillipsburg, New Jersey	aleph 1.2 hi, I built the Aleph 1.2's back in 2000 and they have been very reliable driving any type of speaker--even Maggie 3.6's. They are now driving my Watkins WE-1's which are supposed to be 8 ohm speakers but need a lot of current for their accoustic suspension bass - 2-8" woofers and 1-8" sub. I also used them with Mirage OM-5's and they did really well with them since the MIrages have a built in powered sub. I am converting them to XA100's for a bi-amp line array that I constructed. I am using the Pass/Tharagard A-75 amp to dirve my Watkins now and the difference is that The A-75 has a touch more bass impact but it is hard for me to hear anyother differences. You will like the Aleph's especially if your speaker has a treble rise. good luck, dave

15th August 2007, 01:41 PM	#6
daly41k diyAudio Member Join Date: Feb 2007 Location: Phillipsburg, New Jersey	aleph 1.2's The A75 is a class A design that apperared in AudioXpress in 1992/1993 and was authored by NP and Norm Tharagard. You can buy the boards from Audoxpress by going to their website. This was a great design using mosfets from start to finish and has a regulated driver board. This amp design was published during the same time frame that the Aleph design was commercially produced by NP. It is a rugged and reliable amp that can drive anything. You might want to look up the articles on the web site.

15th August 2007, 01:43 PM	#7
daly41k diyAudio Member Join Date: Feb 2007 Location: Phillipsburg, New Jersey	aleph 1.2's Jupiterjune--You can find the schematic for the xa100 that we are using on the GL thread called XA100. I also have a thread called Aleph 1.2 to XA100. dave

16th August 2007, 09:36 AM	#9
Stefanoo diyAudio Member Join Date: Apr 2006 Location: italia - ora USA -WI	If i recall correctly, Nelson has told once that the AX (the Class A version of the Aleph X) was very close to the original factory design, correct? Anyways....has anybody here ever had the opportunity to compare the "forum version" with the factory release? Is so, would it be possible to share the listening impressions? __________________ Stefano


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12th August 2007, 09:23 PM	#3
Nelson Pass The one and only Join Date: Mar 2001	The A75 is probably more suitable due to the low impedance of most Infinitiy woofers.

15th August 2007, 09:04 AM	#5
back diyAudio Member Join Date: Nov 2005 Location: crete	thanks for your suggestions. the a75 is a class A or class A/AB design? do i need to bias it with class A down to 1ohm?

15th August 2007, 04:16 PM	#8
gl diyAudio Member Join Date: Dec 2003 Location: Sierra Foothills - California	Point of clarification: XA100 = Pass Labs commercial product. AX100 = gl's 100W version of the Aleph-X. Graeme

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