Graham Slee Headphone Amps - Solo headphone amp operation

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Solo headphone amp operation

Printed From: Graham Slee Hifi System Components
Category: Headphone Audio
Forum Name: Graham Slee Headphone Amps
Forum Description: Questions, answers and product information zone for Graham Slee Headphone Amplifiers
URL: https://www.hifisystemcomponents.com/forum/forum_posts.asp?TID=5858
Printed Date: 26 Mar 2026 at 9:09pm
Software Version: Web Wiz Forums 12.01 - http://www.webwizforums.com

Topic: Solo headphone amp operation

Posted By: ohdannyboyc
Subject: Solo headphone amp operation
Date Posted: 13 Jan 2026 at 1:21pm

Hi all.

Having been really pleased with my Era V Gold phono amp, I have just bought a 2nd hand Solo hp amp (an older model i suspect).

I have it connected (Input 1) to the fixed output of my Cyrus Classic amp. First off, it sounds absolutely great! Huge improvement over the Cyrus inbuilt headphone output, and brings my Sennheiser HD650s alive. Id always been a bit underwhelmed with them, but not any more!

I have nothing connected to Input 2 of the Solo, so in theory, there should be no output if Input 2 is selected? However, when i do, i get the same output as #1, but it seems with a noticeably boosted bass and treble (similar overall volume)... A bit like the Loudness button you would get on amps back in the 90s (again, sounds great).

Also, when the input selector is set to mute, the unaltered output from #1 continues (not an issue).

So no complaints at all, just wondering if this is how it should operate, or if perhaps it might have been modded? It was a third party seller, so they probably don't know the background history, and i haven't opened it up to look inside.

Thanks!

Replies:

Posted By: Fatmangolf
Date Posted: 13 Jan 2026 at 7:39pm

As built the middle position of the switch is unconnected to the inputs so there should be no sound in the headphones. I agree with your reasoning that you shouldn't hear input 1 with the switch on 2, and not a filtered version. Curious...

-------------
Jon

Open mind and ears whilst owning GSP Genera, Accession M, Accession MC, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC.