DYohn help!

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Lizardking

Copper - Posts: 184

Joined: August 23, 2004

Posted: October 03, 2004 at 8:25 PM / IP Logged

DYohn,

Wha would you recommend for settings on my LPF and HPF? I'm running Diamond Audio component 6.5 in front doors and Diamond Audio 6.5 coaxils in the rear doors. I'm also running two 12inch Diamond Audio subs firing up. I have a eclipse amp running the full range speakers and a us acoustics 1000d amp for the sub's.. I listen to mainly Rock and some hip hop..

Rushman

Silver - Posts: 380

Joined: September 28, 2004

Location: United States

Posted: October 03, 2004 at 9:54 PM / IP Logged

Im not an expert but maybe an opinion might help........I would put the subs on LPF at or around 80 hz and below and set the HPF around 80hz and up. That way theres not too much of a gap in the frequencies. You can experiment with it until you get somthing you like , isnt that what its about? what YOU like? just a suggestion.

Lizardking

Copper - Posts: 184

Joined: August 23, 2004

Posted: October 03, 2004 at 11:30 PM / IP Logged

I found this to set my gains which I will do tomorrow.. I already made 1000hz (1khz) test tone for HPF and 50hz for the LPF using a tone generator.. Formula below what do you guys think. Found this surfing

So many people have their amp gains set wrong, and to be honest setting them by ear is quite a crapshoot. Doing it properly with a multimeter is actually quite simple.

Here's how you do it:

Set head unit volume to 3/4 of maximum. Turn off all eqs/presets in the head unit.

DISCONNECT SPEAKERS

P = Power in watts

I = Current in amperes

R = Resistance in ohms (effectively the nominal impedance)

V = Potential in volts (Voltage)

Knowns:

Resistance (nominal impedance of your speakers)

Power (desired wattage)

Unknowns:

Voltage (we'll measure this)

Current

Formulas:

P = I*V (formula for power)

V = I*R (Ohm's law)

So after a little substitution to get Voltage in terms of simply power and resistance we get

V = square_root(P*R)

So, for example, say you have a 4 ohm load presented to a 150 watt amp.

V = square_root(150*4) = 24.5 volts

This means you should increase the gain until you read 24.5 volts AC on the speaker outputs of your amplifier.

As a source, use a sine wave recorded at 0db at a frequency within the range you intend to amplify. You can generate tones in cool edit or use a program such as NCH tone generator. (credit for NCH to imtfox, IIRC)

DYohn

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Joined: April 22, 2003

Location: Arizona, United States

Posted: October 04, 2004 at 8:23 AM / IP Logged

80Hz is the baseline frequency suggested by THX for both your subwoofer LPF and your main speakers HPF. It is where I always suggest you set them. If your mains have a hard time getting down that low, adjust both filters up a but, but I suggest not going above 120Hz.

Your gain setting method will work fine. Your 1Khz and 50Hz tones are fine, although it is a bit more accurate if you use a true pink noise signal.

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Lizardking

Copper - Posts: 184

Joined: August 23, 2004

Posted: October 04, 2004 at 10:49 AM / IP Logged

How can I set my lowpass to ensure I get 80hz out of it? My amp reads 30hz-230hz for my lowpass setting.

DYohn

Moderator - Posts: 10,741

Joined: April 22, 2003

Location: Arizona, United States

Posted: October 04, 2004 at 10:54 AM / IP Logged

You'll have to just guess, I guess. :) Half-way on that control will correspond to about 130Hz, so turn it towards 30 about 10 degrees from half.

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Lizardking

Copper - Posts: 184

Joined: August 23, 2004

Posted: October 04, 2004 at 11:50 AM / IP Logged

Cool..Thanks

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DYohn help!

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