Pass X150 power down Thump solution = Jensen Isomax (RCA to XLR converter)??

kmtkwong · 6th October 2007, 07:45 AM

Hello all,

Further to the previous thread about my Pass Labs X150's power down thump, I am thinking to use a Jensen Isomax to convert the RCA to balanced XLR. It is an expensive transformer indeed about $200. I don't know if it is a worthwhile solution for the problem. ALso, is it going to degrade the audio signal, my biggest concern?

Btw, my X150 has no more power down thump if I connect my cd player directly to the amp. I figure it is the DC from my denon causing the problem. I think my X150 is the early production which doesn't have capacitors on the input to prevent DC offset from upstream.

Thanks all

Kelvin

mpmarino · 6th October 2007, 08:11 AM

Why not just put a couple caps at the input and see if it solves your problem? You probably won't even hear it if you use decent ones.

edit: You might still have a small pop but it should be harmless, assuming it's DC that is the issue......

dejanm · 10th October 2007, 02:21 PM

Transformer is better solution than cap for coupling (especially if it is comming from Jensen), but it is also more expensive.

Nelson Pass · 10th October 2007, 11:45 PM

Jensen makes a very fine transformer. Using it provides a
DC connection to ground that you probably were missing.

6th October 2007, 07:45 AM	#1
kmtkwong diyAudio Member Join Date: Oct 2007	Pass X150 power down Thump solution = Jensen Isomax (RCA to XLR converter)?? Hello all, Further to the previous thread about my Pass Labs X150's power down thump, I am thinking to use a Jensen Isomax to convert the RCA to balanced XLR. It is an expensive transformer indeed about $200. I don't know if it is a worthwhile solution for the problem. ALso, is it going to degrade the audio signal, my biggest concern? Btw, my X150 has no more power down thump if I connect my cd player directly to the amp. I figure it is the DC from my denon causing the problem. I think my X150 is the early production which doesn't have capacitors on the input to prevent DC offset from upstream. Thanks all Kelvin

6th October 2007, 08:11 AM	#2
mpmarino diyAudio Member Join Date: Jun 2004 Location: Crunchville, where I don't fit in.	Why not just put a couple caps at the input and see if it solves your problem? You probably won't even hear it if you use decent ones. edit: You might still have a small pop but it should be harmless, assuming it's DC that is the issue...... __________________ Crazy Yankee.

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10th October 2007, 02:21 PM	#3
dejanm diyAudio Member Join Date: Jul 2005 Location: Vienna	Transformer is better solution than cap for coupling (especially if it is comming from Jensen), but it is also more expensive.

10th October 2007, 11:45 PM	#4
Nelson Pass The one and only Join Date: Mar 2001	Jensen makes a very fine transformer. Using it provides a DC connection to ground that you probably were missing.

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