Equalization

Vaughan · 26th August 2007, 06:26 PM

Hi there,

I need some advice. In order to flatten the low frequency response in a car, what are my options ?

Are there any parametric equalizers used in cars ?

I am getting a parametric EQ for home use called the Velodyne SMS-1 tommorrow which I've been told is exceptional. But now I need something for the car. The way I see it, if there is a big peak at 60 hz or any specific frequency, it could be problematic.

So what do you guys do in this case ? It's not as if there are cabin acoustic treatments, right ? If you want a nice relatively flat response where the bass is not predominently boomy because certain frequencies are overpowering others, I have to assume that parametric EQ or something similar is the means to do this.

What are your thoughts ?

--Regards,

Perry Babin · 26th August 2007, 07:58 PM

If there is a sharp peak, the box may be too small for the woofer or, if it's ported, the port tuning frequency may be too high.

Vaughan · 26th August 2007, 08:11 PM

For those who don't use big enclosures but would like a small form factor, are there ways of smoothing the response with EQ ?

--Regards,

Perry Babin · 26th August 2007, 08:30 PM

You can smooth the response with an EQ but it's better to get the enclosure right. There are speakers designed to work in small enclosures. The correct speaker/enclosure combination may be a less expensive alternative than a parametric EQ.

Vaughan · 26th August 2007, 09:28 PM

The problem is that I'm not sure that the installers would be able to build the correct enclosure size. If I go to a car audio shop and purchase two 12" Pioneer DVC-12's (obviously there will be an enclosure size that is appropriate for those drivers) the technicians don't have custom made enclosures.

They've just got enclosures designed for 12 " or dual 12" drivers. That isn't ideal because the T/S parameters will vary from driver to driver. And I'm not handy with a saw.

This is why I mentioned EQ.

--Regards,

theAnonymous1 · 27th August 2007, 07:55 AM

If your box is sealed I suggest a linkwitz transform.

Vaughan · 27th August 2007, 04:33 PM

Okay, besides a linkwitz transform (

) and besides having the enclosure built perfectly for a given driver, what other alternatives do I have to flatten the response and get rid of overwhelming boom ?

Is there a way to calibrate the bass from the subwoofer to integrate with the mains ?

--Regards,

26th August 2007, 06:26 PM	#1
Vaughan diyAudio Member Join Date: Jan 2004	Equalization Hi there, I need some advice. In order to flatten the low frequency response in a car, what are my options ? Are there any parametric equalizers used in cars ? I am getting a parametric EQ for home use called the Velodyne SMS-1 tommorrow which I've been told is exceptional. But now I need something for the car. The way I see it, if there is a big peak at 60 hz or any specific frequency, it could be problematic. So what do you guys do in this case ? It's not as if there are cabin acoustic treatments, right ? If you want a nice relatively flat response where the bass is not predominently boomy because certain frequencies are overpowering others, I have to assume that parametric EQ or something similar is the means to do this. What are your thoughts ? --Regards,

26th August 2007, 07:58 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	If there is a sharp peak, the box may be too small for the woofer or, if it's ported, the port tuning frequency may be too high. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

26th August 2007, 08:30 PM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	You can smooth the response with an EQ but it's better to get the enclosure right. There are speakers designed to work in small enclosures. The correct speaker/enclosure combination may be a less expensive alternative than a parametric EQ. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

27th August 2007, 07:55 AM	#6
theAnonymous1 diyAudio Member Join Date: Feb 2004 Location: Anonymityville	If your box is sealed I suggest a linkwitz transform. __________________ "If you don't like funerals don't kick sand in Ninja's face." - Ninja

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26th August 2007, 08:11 PM	#3
Vaughan diyAudio Member Join Date: Jan 2004	For those who don't use big enclosures but would like a small form factor, are there ways of smoothing the response with EQ ? --Regards,

26th August 2007, 09:28 PM	#5
Vaughan diyAudio Member Join Date: Jan 2004	The problem is that I'm not sure that the installers would be able to build the correct enclosure size. If I go to a car audio shop and purchase two 12" Pioneer DVC-12's (obviously there will be an enclosure size that is appropriate for those drivers) the technicians don't have custom made enclosures. They've just got enclosures designed for 12 " or dual 12" drivers. That isn't ideal because the T/S parameters will vary from driver to driver. And I'm not handy with a saw. This is why I mentioned EQ. --Regards,

27th August 2007, 04:33 PM	#7
Vaughan diyAudio Member Join Date: Jan 2004	Okay, besides a linkwitz transform ( ) and besides having the enclosure built perfectly for a given driver, what other alternatives do I have to flatten the response and get rid of overwhelming boom ? Is there a way to calibrate the bass from the subwoofer to integrate with the mains ? --Regards,

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