Graham Slee Headphone Amps - Solo Ultra Linear headphone Impedance

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Solo Ultra Linear headphone Impedance

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=5739
Printed Date: 27 Mar 2026 at 3:58am
Software Version: Web Wiz Forums 12.01 - http://www.webwizforums.com

Topic: Solo Ultra Linear headphone Impedance

Posted By: Chris-T
Subject: Solo Ultra Linear headphone Impedance
Date Posted: 21 Aug 2024 at 8:36pm

I have a Solo Ultra Linear and was thinking of buying some 600 ohm headphones. can anyone tell me if the amp is capable of driving them or should I go for the apparently inferior 250 ohm version?

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Chris

Replies:

Posted By: Fatmangolf
Date Posted: 22 Aug 2024 at 7:56pm

AFAIK the Solo will work well with either impedance.

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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.

Posted By: Delfalex
Date Posted: 22 Aug 2024 at 11:37pm

Hi Chris,

I'm using a Solo U.L.D.E to power some HD540 Gold 600ohm open headphones and it has absolutely no problems driving them. For such an impedance I have the volume knob set at about 2-4 o'clock, whereas I set it to about 12 o'clock when powering some closed 300ohm HD250 II.

Alex

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DAK 3A 5V > Squeezebox Touch > Lautus USB > Bitzie > CuSat50 > Solo ULDE > HD540 Ref Gold / II & HD250 Linear

Posted By: Chris-T
Date Posted: 23 Aug 2024 at 7:11am

Thanks both and particularly to Delfalex for the more detailed answer.

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Chris

Posted By: Proffessa
Date Posted: 07 Mar 2025 at 12:21am

What's the minimum impedance the ULDE should be running? I think I'm pushing it a little here.. I tried my simgot supermix4 iems on her and they sounded incredibly bassy. They have an impedance of 7.2ohm @ 1k. I suspect that's throwing the balance off xx

Posted By: CageyH
Date Posted: 07 Mar 2025 at 5:33pm

Headphone impedance range

8 to 2,000 Ohms / 16 to 600 Ohms preferred

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Kevin
European loan coordinator, based near Toulouse, France.
Funkified SL1200 Mk.II, BB3, Firebottle Kin , ADI-2 DAC FS, Modulus 686, PD-S703, Solo UL, Triangle Antal EZ

Posted By: Proffessa
Date Posted: 07 Mar 2025 at 6:14pm

Nice one CageyH. Cheers man. Figures lol xx