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jonsimons
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Last seen: 1 year 8 months ago
Joined: Nov 15 2012 - 1:18pm
Luxman SQ-38u - Please help

This is the first time I've ever posted on a hi-fi site but could really use some expert advice.

I just recently purchased a slightly-used Luxman SQ-38u froma Luxman dealer.  He promised me that the amp is essentially like-new and even offered the full 2-year warranty through his shop.  Given that it doesn't need break-in time (since it's not new), I was surprised by the sound.  The mid-range itself sounds really great.  The low-bass is also pretty good for a tube amp.  But there seems to be basically no low-mids whatsoever.  So, for example, with low notes on a cello, or bass guitar, you can hear the boomy low bass but not any defintion.  It's just a big hole in the spectrum.

Might this be a problem with the amp?  If it had a bad tube, would it cause frequency dropout like this or more obvious artefacts?

If I can somehow find some reassurance that the amp is performing like-new, then I would conclude that it's just a weird mismatch with my speakers (PMC PMC DB1i's).  But I don't want to go in circles demoing or replacing my speakers if the Luxman itself is not performing as it should.

Any thoughts would be much appreciated!  Thanks!

jackfish
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Joined: Dec 19 2005 - 2:42pm
Maybe your speakers have an impedance curve that the

amplifier has a problem with?

jonsimons
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I also see that the Luxman

I also see that the Luxman does not meet the recommended power minimum stated for the PMC speakers.  At 8 ohms, the Luxman is rated at 25 wpc while the PMC speakers are supposed to be getting 40 - 200 watts.  Does anyone think that underpowering a speaker would cause the experience I am having with the setup?

jackfish
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Definitely...

You need speakers with higher sensitivity to use with that amp, or an amp with the power to control the speakers properly.

jgossman
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I hate to say it..

PMC are great (but then I've only heard one pair, so that's not definitive!), and the Luxman amps I've heard are great, but I don't think they are going to work together.  Those speaks need more juice.  Maybe a souped up SE-40 (it's in the trannies, not the output watts) or ARC or something solid state.

Unfortunately, some speakers are just tube-lexic.

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