Did I buy a broken amp?


I purchased a used amp to mate with a dac / preamp in the same line which I own. The new amp is suppose to be 150 watts into 8ohm.  When I play the amp at 35/100 volume, I barely hear any sound.  I need to get volume  to at least 75/100 or 80/100 to provide adequate listening sound. 75/100 sounds how 50/100 should sound. (And so on)   It does not seem to clip or distort.   Could the amp be broken or does it just not provide enough juice for my speakers? 
Equipment:
Preamplifier / Dac Wadia 321
amplifier:wadia 315 
Apple TV source 
speakers: Kef 201/2
puffbojie
Disconnect the preamp. Connect the TV audio left & right outputs to the amp inputs. Use the remote to control the sound volume. If this results in adequate volume then your amp is ok. The preamp is now suspect! 
Does the Wadia amp have input level controls? If so, these may be set too low!
puffbojie

It’s all good the input sens is on the amp 2.4V Balanced 1.2V Unbalanced, and what you’ll find is the volume on the dac will be logarithmic, and after 80 it will go up twice as fast as it did before 80.
All this is good that your up so high on the digital domain volume control, as you run far less risk of "bit strtipping" (detail loss) if your up high rather down low in the count for the same volume.

Cheers George
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