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High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place. |
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High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place. |
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In Reply to: Bass control with low powered tube amps posted by tomtom58 on October 24, 2016 at 07:41:16:
Not HE, and no SET experience, either. SEUL yes.But I've used critically damped QB3 RB speakers for a long time, carefully positioned at unequal path lengths from side wall, floor and front wall.
When I first put valve power amps into the system, a rebuilt Radford STA15 but still using a VR, there was very little difference in the bass.
But the Radford STA 25 - also provided in the same loan - and with a much higher storage PSU, sounded a whole lot better in the bass. I listen to acoustic organ music at least once a week, so I know how difficult reproducing that is.
I have persisted with rebuilt push-pull classic valve amps ever since, with SR SS diodes and great big PSU caps and high storage.
IME a high storage PSU PP valve amp of even just 20WPC can sound a LOT more powerful, and in control than any similarly powered SS power amp, even a medium power Class-A with a necessarily big PSU.
PSU storage is 1/2 the capacitance times the voltage squared. Valve amps have a big advantage when bass power demands are highest.
My current pair of modified 'once were' LEAK Stereo 20s have an output Z of 1.5 ohms at 100 Hz IIRC when the 8 ohms taps are connected.
I will soon be using them strapped in parallel, giving 40 Watts RMS in pentode, and on their 4 ohm taps, which in parallel is a virtual 2 ohm tap. I don't know how low the opt z will be but it will be low. ? Driving QUAD 63s.
Warmest
Tim Bailey
Skeptical Measurer & Audio Scrounger
Edits: 10/25/16 10/25/16
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Follow Ups
- IME the room's resonances, spkr positioning, and the speaker's onw Qtc dominate and DF is out of the race - Timbo in Oz 20:14:48 10/24/16 (0)
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