Crossover Settings?

bpd138 · 05-25-2009, 06:39 PM

Hello again,
I have a qusetion about crossover settings.

I have the kenwood DNX8120 HU and a Infinity Reference 475a Amp.

I'm running 6.5" Polk DB651 speakers in the doors and 3.5" Polk DB351 speakers in the rear.

My HU has the ability to set the crossover frequency and so does my Amp.

Do I need to set the crossver settings in both the HU and the Amp? Or is it one or the other? I'm not sure but I would think setting them both would be like doubling the effect?

Any suggestions on good starting points? I read somewhere that smaller speakers needed a higher setting, somewhere above 100hz and larger ones needed lower settings.

Any help would be greatly appreciated.
Take care,
Willie

bpd138 · 05-28-2009, 12:08 AM

Bump...Anyone please

DIGItonium · 05-28-2009, 03:09 PM

Crossover is basically a variable filter. So if you filter something, and pass it through another filter with same parameters, you will further attenuate whatever you're trying to filter.

You can technically set the amplifier's crossover to "thru" or "bypass" and let your headunit do all the work, and vice versa. If you want further fine tuning, you can enable both.

For subwoofers, you want to use Low Pass (LPF). For full range and components, use the High Pass (HPF) setting. You want to let your speakers to perform its best in a certain range while filling the void.

For your mains, it depends on its range. High performance speakers can go further down the range. I would probably set it close to 100Hz for starters, and let the sub do the rest.

Don't forget to take advantage of your 13-band EQ to further fine tune your speakers in the cabin.

2fast4thelaw · 05-30-2009, 01:51 PM

Set the fronts to 50 or 60hz at 12db/oct. If you have a sub. Set it at 50 or 60Hz at 24db/oct. Your rear speakers should be set to 300Hz at 6db/oct. This will give you up front and in your face bass. The rears you dont want to play bass since they are so small and are only for rear fill.

I would start there at those points.

I suggest using crossovers on your amp if you can. Amplifier crossovers are typically more accurate. Do Not use both together or they will multiply. Use one or the other.

antennahead · 05-30-2009, 02:12 PM

Quote:

Originally Posted by 2fast4thelaw

Set the fronts to 50 or 60hz at 12db/oct. If you have a sub. Set it at 50 or 60Hz at 24db/oct. Your rear speakers should be set to 300Hz at 6db/oct. This will give you up front and in your face bass. The rears you dont want to play bass since they are so small and are only for rear fill.

I would start there at those points.

I suggest using crossovers on your amp if you can. Amplifier crossovers are typically more accurate. Do Not use both together or they will multiply. Use one or the other.

LOL, you and I think exactly alike, I was going to post this the other night:

60hz fronts 12 db per octave
60hz for sub 24db per octave
250 to 300 rears at 6 bd per octave (would be nice to purchase a high end 3.5" mid for this speaker)

John

05-25-2009, 06:39 PM	#1 (permalink)
bpd138 Base Member Join Date: Apr 2009 Location: Massachusetts Posts: 38 Drives: 370Z Auto W/Sport Rep Power: 16	Crossover Settings? Hello again, I have a qusetion about crossover settings. I have the kenwood DNX8120 HU and a Infinity Reference 475a Amp. I'm running 6.5" Polk DB651 speakers in the doors and 3.5" Polk DB351 speakers in the rear. My HU has the ability to set the crossover frequency and so does my Amp. Do I need to set the crossver settings in both the HU and the Amp? Or is it one or the other? I'm not sure but I would think setting them both would be like doubling the effect? Any suggestions on good starting points? I read somewhere that smaller speakers needed a higher setting, somewhere above 100hz and larger ones needed lower settings. Any help would be greatly appreciated. Take care, Willie Last edited by bpd138; 05-30-2009 at 01:53 PM.

05-28-2009, 03:09 PM	#3 (permalink)
DIGItonium A True Z Fanatic Join Date: Jan 2009 Location: Kansas Posts: 3,800 Drives: 09 Z34-TT 6MT Rep Power: 42	Crossover is basically a variable filter. So if you filter something, and pass it through another filter with same parameters, you will further attenuate whatever you're trying to filter. You can technically set the amplifier's crossover to "thru" or "bypass" and let your headunit do all the work, and vice versa. If you want further fine tuning, you can enable both. For subwoofers, you want to use Low Pass (LPF). For full range and components, use the High Pass (HPF) setting. You want to let your speakers to perform its best in a certain range while filling the void. For your mains, it depends on its range. High performance speakers can go further down the range. I would probably set it close to 100Hz for starters, and let the sub do the rest. Don't forget to take advantage of your 13-band EQ to further fine tune your speakers in the cabin. __________________

05-30-2009, 01:51 PM	#4 (permalink)
2fast4thelaw Enthusiast Member Join Date: Feb 2009 Location: Denver Co Age: 49 Posts: 403 Drives: 09 370Z Sport/MT6 Rep Power: 16	Crossover Points Set the fronts to 50 or 60hz at 12db/oct. If you have a sub. Set it at 50 or 60Hz at 24db/oct. Your rear speakers should be set to 300Hz at 6db/oct. This will give you up front and in your face bass. The rears you dont want to play bass since they are so small and are only for rear fill. I would start there at those points. I suggest using crossovers on your amp if you can. Amplifier crossovers are typically more accurate. Do Not use both together or they will multiply. Use one or the other.

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bpd138 Base Member Join Date: Apr 2009 Location: Massachusetts Posts: 38 Drives: 370Z Auto W/Sport Rep Power: 16	Bump...Anyone please