Help setting gain

[aeon 10+ year member]

Well I read through all of the articles and searched through a bunhc of thread on how to set my gain.

I have some diamond audio d361 speaker

Type: Component

Size: 6 in.inch Mid 1 in.inch Tweet

Power Handling NOM/MAX: 60/120 watts

Sensitivity (2.83V/1m): 91 dB SPL

Freq. Response: 54-20

Mounting Depth/Diameter: 2.5 in. / 5.4 in.

and a diamond audio D3400.2 amp

Type: Full Range

Channels: 2

RMS @ 4 Ohm: 100 x 2

RMS Mono: 400 x 1 @ 4 Ohm

THD: 0.05%

Crossovers: Low Pass, High Pass

I used a volt meter to measure the output to each speaker and I set the gain so that 20 volts was the output. Is 20 volts the correct amount? Well the problem I'm having is when I turn the volume up a little pass have way, I get some really weird noises. Like cracking and thumping noises.. Am I give the speakers to much power or is it another problem? I've also checked all of my grounding.

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[iwantmorebass 10+ year member]

turn the gain down a bit

 

[aeon 10+ year member]

okay

 

[aeon 10+ year member]

well tried turning it down still the same problem. turned it all the way down and still have the same problem... any other suggestions?