Originally Posted by punkaroo
Just curious: how well would the Lyr power a set of K1000s?
The manufacturer has already responded, but let's work out the numbers on a cocktail napkin (your drink of choice):
IIRC the K1000 spec is 74dB/mWatt @ 120 ohms. This translates to 104dB/Watt. From their spec of the Lyr at 20V peak, that maps to a peak power of 3.33 Watts @ 120 ohms, and just under 2 Watts continuous. So you're looking at ~108dB peak SPL, and just under 107dB continuous. I've run a speaker rig with a very comparable peak SPL (25-55 Watts on 93dB/Watt speakers @ 8 feet). It's WAY more than enough for pop/rock recordings; these require very little headroom over average level. You can make your ears bleed if you like. It's OK for up to "loud-ish" volumes with very high dynamic range recordings. Though, I have encountered hard clipping with such a system when pushing a notoriously high dynamic range recording (Sheffield Labs Direct Disc Recording of Firebird Suite) into decidedly loud territory (that was a mistake; quickly rectified). I did notice an improvement in this system when moving to a higher power amp (250 Watts/ch), but it's also a higher quality amp; not just more power. Both were pure tube amps, which will have their distortion levels rise rapidly as the max rated power is approached (and exceeded).
With headphones I'd recommend lower levels than with speakers, to protect your hearing. That should buy you some headroom. So, as long as the Lyr sounds good right up to its rated power, then you should be fine to drive the K1000 with this amp. We'll have to assume that your source's output level and the Lyr's gain permit you to reach the amp's power output capacity at least at full volume throttle - double check this though; some of the very-low output MC cartridges make it hard to get enough gain downstream.