Wanting to verify my gain settings. The amp is the Diamond 800.4, 120x4 @ 4ohms. It has two seperate gain adjustments. 120w x 4 = 480w. 480/2 (two separate settings controls) =240. 240 x 4ohms = 960. The square root of 960 is 30.98v. This is the acv I should adjust to using a DMM at the speaker terminals on the amp. Correct??

Also, I have the Sony MEX-M70 head unit. I think I read somewhere that I should set the HPF and LPF adjustments to flat on the amp, and make frequency adjustments on the head unit itself. If so, where should I set the head unit? Speakers are Hertz MPK components in the fairing and Pioneer TS 6900 in the lids.

Thanks in advance for any responses.

 

With a 4 channel amp you have to treat it as 2 separate amps when setting the gains.

As for adjustments when fine tuning leave the amp on flat/full pass and make your adjustments on the head unit.

What speakers are you using with this set up?

That amp with a 1k test tone and no load will show clipping around 175watts per channel so watch your voltage output settings on the amp so you don't overpay your speakers

 

Slys Target VAC Chart

 

Thanks, just wanted to verify how to come up with the power in watts on the chart.

 

I'll never understand all this. But I'm watching this thread anyway.

 

Just to clarify for you, the HPF on the head unit is for front and rear together, they are not separate filters.

Also, using the chart you'll set your output at 140watts but that amp will put out way more clean power than that (most top brands are underrated). You'll need a way to check how high you can output with an oscilloscope or something else to measure clipping.

 

The Diamond HXM 800.4 has CLIPPING lights and they are extremely close to the DD-1.
I just did an install and set up with that amp a few weeks back

 

ohhhh well then, the OP should just use those.

Just check the wattage to make sure it's not beyond the speakers and you're golden!

Not sure about those speakers but I run my VO's at 100 with a -12db slope. I run the M770's at 70 with a -18db slope but like I said above, the Sony head unit has a shared HPF so you'll probably want to set the HPF's on the amp.

 

how do you like the HXM 800.4? I'm down to either that or an HPD4 in my bag for my new setup

 

Could you explain "close to the DD-1" please? Are you saying that I should use 120x4 @ 4ohms that the amp is spec'd at? Thanks