I have the answer finally ... After spending 30 minutes on the phone with PE Tech, it has been determined the stated specs of ;
Specifications:
• Power output (with 50 VDC power supply): 500W (3 ohms, THD 10%), 312W (3 ohms, THD 1%)
• Minimum impedance: 2.5 ohms
• Frequency response: 20 to 20,000 Hz (±3 dB)
• Recommended power supply: 24 to 50 VDC, 12.6A regulated
• Fixed gain settings: 28.5 dB, 30.5 dB, 32.5 dB
• Power input jack: 2.5 x 5.5 mm, center-positive
• Dimensions: 6.8" L x 4.5" W x 1.48" H
• Weight: 680g
is not correct for the current model of this amplifier, with reference only to the " Fixed gain settings: 28.5 dB, 30.5 dB, 32.5 dB" line of the specs. Maybe it was the specs before the reputed changing for better cooling of Sure amps.
But this amp does not have any way to control the gain, except one, without buying an external part ... The answer is .... turn down the output voltage of the power supply. That is it. The $10 external digital volume control found here at PE,
AA-AB41116 Digitally Controlled Stereo Electronic Audio Volume Control
This will allow you to turn the volume down to a better gain matching level with your source. Leave it where it is best. I was going to hard wire mine to the amp's inputs on the board itself, as an onboard gain.
With full agreement from PE, these ARE the correct answers.
Of course, any kind of buffer, etc is also an option. Just not as transparent as the Sure volume control is.
