Question for Me Nelson Pass about XA100.5

jpspock · 10th July 2011, 05:34 PM

Dear Mr Pass,

first of all I would like to thank you for your formidable instrument. It makes great music. For the moment I use a XA100.5 with a pair of WA Sasha and I would like to combine the XA100.5 with a ARC Ref5. I would need your point of view on the technical side. My question comes from a reflection :
" the input impedance of the XA160.5 is 30/20 Kohms (Bal/SE) and while the nominal impedance output of the Ref 5 is 600/300 ohms (Bal/SE), if it's like the Ref 3 it's output impedance gets close to 1.7Kohms somewhere in the 100-200Hz range I believe, so if the partnering amp is not of sufficiently high input impedance the match up tends to sound bass shy/thin."

So as I'm not a specialist, would it be possible to know if you see any technical conflict or problems if I associate the XA100.5 and REF5?

Many thanks for your help.

Jean-Paul

Nelson Pass · 10th July 2011, 06:50 PM

Our experience is no problems at all with the ARC or CJ products with
regard to interface. The amp doesn't care about source impedance. It's
actual input impedance is close to 0 ohms, and the input impedance spec
comes from the resistors we put in series with that input. Adding a little more
from the source doesn't create issues.

jpspock · 11th July 2011, 05:20 PM

Many thanks for your answer, I will give you a feedback about the association. I'll try to make a comparison with your new preamp XP30. Can you describe us a little this new preamp and what we can hope from it compared with the XP20?

wayne · 21st July 2011, 10:41 PM

From customer #1 who has an XP20 "blackness, depth, cohesiveness, resolution and dynamics the XP-30 is STUNNING!"
Just one opinion but it is a step up.

Hasse · 4th September 2011, 07:26 PM

Hi Nelson, I was wondering whether the XA or X-series amps would be the best match with the Maggie 3.7? Would the XA100.5 monos have enough power to make the 3.7s sing? Magnepan Magneplanar MG3.6/R loudspeaker Measurements | Stereophile.com
Your input would be highly appreciated.

Regards,
Hasse

Nelson Pass · 5th September 2011, 07:27 PM

Personally I always go with XA's. Some people want more output wattage
within a price tag, so the X series remains popular.

21st July 2011, 10:41 PM	#4
wayne In the hills diyAudio Member Join Date: Jan 2002 Location: Northern California	XP30 From customer #1 who has an XP20 "blackness, depth, cohesiveness, resolution and dynamics the XP-30 is STUNNING!" Just one opinion but it is a step up.

4th September 2011, 07:26 PM	#5
Hasse diyAudio Member Join Date: Sep 2011	XA or X-series for Magnepans Hi Nelson, I was wondering whether the XA or X-series amps would be the best match with the Maggie 3.7? Would the XA100.5 monos have enough power to make the 3.7s sing? Magnepan Magneplanar MG3.6/R loudspeaker Measurements \| Stereophile.com Your input would be highly appreciated. Regards, Hasse

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10th July 2011, 05:34 PM	#1
jpspock diyAudio Member Join Date: Dec 2010	Question for Me Nelson Pass about XA100.5 Dear Mr Pass, first of all I would like to thank you for your formidable instrument. It makes great music. For the moment I use a XA100.5 with a pair of WA Sasha and I would like to combine the XA100.5 with a ARC Ref5. I would need your point of view on the technical side. My question comes from a reflection : " the input impedance of the XA160.5 is 30/20 Kohms (Bal/SE) and while the nominal impedance output of the Ref 5 is 600/300 ohms (Bal/SE), if it's like the Ref 3 it's output impedance gets close to 1.7Kohms somewhere in the 100-200Hz range I believe, so if the partnering amp is not of sufficiently high input impedance the match up tends to sound bass shy/thin." So as I'm not a specialist, would it be possible to know if you see any technical conflict or problems if I associate the XA100.5 and REF5? Many thanks for your help. Jean-Paul

10th July 2011, 06:50 PM	#2
Nelson Pass The one and only Join Date: Mar 2001	Our experience is no problems at all with the ARC or CJ products with regard to interface. The amp doesn't care about source impedance. It's actual input impedance is close to 0 ohms, and the input impedance spec comes from the resistors we put in series with that input. Adding a little more from the source doesn't create issues.

11th July 2011, 05:20 PM	#3
jpspock diyAudio Member Join Date: Dec 2010	Many thanks for your answer, I will give you a feedback about the association. I'll try to make a comparison with your new preamp XP30. Can you describe us a little this new preamp and what we can hope from it compared with the XP20?

5th September 2011, 07:27 PM	#6
Nelson Pass The one and only Join Date: Mar 2001	Personally I always go with XA's. Some people want more output wattage within a price tag, so the X series remains popular.