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Pass Labs X-1 -VS- Adcom GFP-750 Preamp

This thread is for people who own, or have owned both the Pass Labs X-1 and the Adcom GFP-750 preamps.
I am curious because the circuitry in both preamps was more or less designed by Nelson Pass.
What all sonic advantages does the Pass Labs X-1 have over the Adcom GFP-750, top to bottom and everything in between, when using the Adcom in both its Active mode and in its passive mode?
Does the Adcom have ANY sonic advantages at all over the Pass, or only disadvantages?
Is the Pass X-1's sonic improvement small, moderate, big, or dramatic?
Finally to those or have heard, owned, or compared both:
What all sonic improvements does the Pass Labs X-1 offer over the Pass Labs X-2.5 preamp?
How noticable are the improvements?
Thanks in advance.
daltonlanny

Showing 1 response by aaronm

aaronm's avatar
aaronm
99 posts
 
After reading reviews of the Adcom, I had auditioned it in my home for an office system. While the Adcom might have been adequate for many people's office system, for me comparing the two was comical.

The Adcom had nowhere near the transparency of the Pass and the Adcom in active mode was much noisier. I had to use it in passive to get it to be as quiet as the Pass. As this was in my office and would be almost a nearfield listening set up, the noise level was more critical than usual.

If one can afford the X1, I would suggest it over the GFP.

Best Regards
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