Not too many tube amps have bass. Selling this amp will make much more sense than sending it back. It's popular and should sell over ebay or here.
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I'm, not familiar with your speakers so take this for what it's worth, but EL34 tubes are more famous for a great mid range than extended highs or bass. This may not be the integrated amp for you and/or your speakers, or any speakers, if you want a lot of bass.
Out of curiosity do I assume correctly that prior to getting this amp you were driving these speakers with a solid state unit. Or are these speakers new to you as well. I only ask that because small speakers themselves are more often than not lacking in bass response. Perhaps it is a combo of a EL34 tube based amp and small speakers. FWIW.
if your speakers are out of phase- no bass. that is pos to neg and neg to pos- reversed phasing. also, inefficient speakers are not recommended for a modest powered tube amp. back in the day a lot of the solid state gear put out by pioneer and Marantz fell in the 25 to 35 wpc range with a 45wpc amp/receiver considered pretty powerful. Those sounded so pleasant, but speakers then were different too. today some speakers are really inefficient requiring a lot of power just do drive them. Why? Beats me. I sell Jolida gear and vintage Klipsch speakers, and vintage Advents. This amp should sound great with some Klipsch reference speakers. Some speakers are just best with high powered SS amps. Paradigm, PSB speakers, Klipsch. There are some good buys on vintage Klipsch. Set the bias on the amp, and check reset tubes. If problem persists, take it to a shop.
Thank you for all the responses and sorry about the 2 year delay in reply!
I am still with my amp, despite my bass complaints - as I just love the way it sounds otherwise. But yes, I'm still lacking bass.
I have tried swapping over the cables of one speaker to test the phase, I lost more bass - so I guess I had that right :)
For the Triode/Ultralinear I'm not clear when it is in each mode - is the indicator light red when in ultralinear? If so this makes sense as I hear a slight improvement.
So, it sounds like I need to address my speakers? Will impedance make a difference, or should I just focus on sensitivity?
Can't believe nobody has asked this yet.
But have you tried the 4ohm speaker tap on the amp?? You will loose half the wattage, but what's there may drive the bass much better. Triode mode/4ohm tap is it's lowest output impedance, which may fix the bass problem, but leave you short on big loudness levels.
As if these speakers dip down to 4ohm in the bass and have a heavy negative phase angle as well this will kill the bass of the amp.