Appropriate Preamp for Aleph 2 question

TwangBar · 24th September 2009, 12:31 PM

I am thinking of using a Grace Design m902 with my Aleph 2. Are there output impedance requirements etc. for preamps that the Aleph 2 demands?

The m902 is more of a headphone amp but can be used as a preamp. It has an output impedance of 1 ohm and Maximum Output Level @1kHz, 50 Ohm load of +21.4dBu (9.11Vrms). Would this work ok?

Any advice or comments would be very much appreciated.

Cheers

SRMcGee · 24th September 2009, 12:41 PM

Twangbar:

At the risk of stating the obvious, have you considered a Pass preamp, such as the Aleph P or B1?

Regards,
Scott

TwangBar · 24th September 2009, 12:50 PM

Hi Scott,

I actually have an X2 right now (which is great!) but am considering the m902 for it's DAC and headphone amp abilities. And yo be honest, the sale of the X2 is needed for the switch.

Cheers

Nelson Pass · 24th September 2009, 09:08 PM

The Aleph 2 is pretty happy with any ordinary source
impedance. If you drive the input with 1 megohm source,
the circuit still thinks there's 4.7 Kohm there, so I don't think
there's much to worry about.

TwangBar · 25th September 2009, 12:46 AM

Thanks very much for the reply Nelson. I am humbled by your generosity!

24th September 2009, 12:31 PM	#1
TwangBar diyAudio Member Join Date: Jan 2003 Location: Ottawa, Canada	Appropriate Preamp for Aleph 2 question I am thinking of using a Grace Design m902 with my Aleph 2. Are there output impedance requirements etc. for preamps that the Aleph 2 demands? The m902 is more of a headphone amp but can be used as a preamp. It has an output impedance of 1 ohm and Maximum Output Level @1kHz, 50 Ohm load of +21.4dBu (9.11Vrms). Would this work ok? Any advice or comments would be very much appreciated. Cheers

24th September 2009, 12:41 PM	#2
SRMcGee diyAudio Member Join Date: May 2004 Location: Wynnewood, PA	Twangbar: At the risk of stating the obvious, have you considered a Pass preamp, such as the Aleph P or B1? Regards, Scott __________________ Good decisions derive from experience; experience derives from bad decisions.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Aleph P preamp	John Caswell	Pass Labs	7	6th May 2008 09:26 AM
wtb: aleph 1.7 preamp PCB	jarthel	Swap Meet	0	25th June 2007 02:28 PM
Aleph P 1.7 / Aleph 1.2 Balanced IC Question	SRMcGee	Pass Labs	2	25th March 2007 04:16 PM
aleph-x preamp question	oliverniekamp	Pass Labs	7	1st March 2007 01:24 PM
preamp Amp-On for Aleph 2 ?	pyro2006	Pass Labs	1	10th December 2006 03:25 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	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

24th September 2009, 12:50 PM	#3
TwangBar diyAudio Member Join Date: Jan 2003 Location: Ottawa, Canada	Hi Scott, I actually have an X2 right now (which is great!) but am considering the m902 for it's DAC and headphone amp abilities. And yo be honest, the sale of the X2 is needed for the switch. Cheers

24th September 2009, 09:08 PM	#4
Nelson Pass The one and only Join Date: Mar 2001	The Aleph 2 is pretty happy with any ordinary source impedance. If you drive the input with 1 megohm source, the circuit still thinks there's 4.7 Kohm there, so I don't think there's much to worry about.

25th September 2009, 12:46 AM	#5
TwangBar diyAudio Member Join Date: Jan 2003 Location: Ottawa, Canada	Thanks very much for the reply Nelson. I am humbled by your generosity!

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)