Pass X250.5 question for Nelson

georgehifi · 9th March 2005, 11:18 PM

Nelson is it possible to have the X250.5 with an unbalanced input impeadance of 200k instead of 11k if ordered from the factory?

Cheers George

Nelson Pass · 10th March 2005, 06:31 PM

No, but you can put 189K in series with the + input and
ground the negative input (pins 1 and 3 of the XLR
connector.

Your gain will go down a bit.

uli · 13th March 2005, 09:20 PM

Quote:

Originally posted by Nelson Pass
Your gain will go down a bit.

Kinda power follower or unity gain buffer?

Uli

Nelson Pass · 14th March 2005, 06:26 PM

It will still have some gain - not much, though.

More to the point, why would anyone need the 200K
input anyway? It will still take the same amount of
current to drive the amp to whatever figure you want.

georgehifi · 15th March 2005, 07:37 PM

Quote:

Originally posted by Nelson Pass
It will still have some gain - not much, though.

More to the point, why would anyone need the 200K
input anyway? It will still take the same amount of
current to drive the amp to whatever figure you want.

High source output impeadance that has to drive 2x amps .

Cheers George

9th March 2005, 11:18 PM	#1
georgehifi diyAudio Member Join Date: Sep 2003 Location: Manly Australia (Jewel of the Pacific)	Pass X250.5 question for Nelson Nelson is it possible to have the X250.5 with an unbalanced input impeadance of 200k instead of 11k if ordered from the factory? Cheers George __________________ Avatar : Production Lightspeed Attenuator www.lightspeedattenuator.com

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10th March 2005, 06:31 PM	#2
Nelson Pass The one and only Join Date: Mar 2001	No, but you can put 189K in series with the + input and ground the negative input (pins 1 and 3 of the XLR connector. Your gain will go down a bit.

14th March 2005, 06:26 PM	#4
Nelson Pass The one and only Join Date: Mar 2001	It will still have some gain - not much, though. More to the point, why would anyone need the 200K input anyway? It will still take the same amount of current to drive the amp to whatever figure you want.