Sub Specs

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=40159
Printed Date: July 12, 2025 at 3:10 PM

Topic: Sub Specs

Posted By: thapimpfromchi
Subject: Sub Specs
Date Posted: October 02, 2004 at 10:29 AM

Hey guys, I forget what i'm supposed to look for when it comes to the technical stuff on a sub, like f's, and q's, and all that. I found the spec sheet on the subs I am using right now. Tell me what u think:

Power (watts peak): 1200

Nom Impedance (ohm) 8

Voice Coil: 2.5" KSV

Magnet Structure: 2x90oz

Fs: 23.2

Qms: 4.92

Qes: 0.84

Qts: 0.72

SPL: 85

vas: 4.908

Now, I know these specs are probably horrible, but can u tell me for future references what i want next time? Thanks alot.

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1990 Honda Civic HB:
Clarion DXZ545MP H.U.
2- 6.5" Power Acoustik interiors
Diamond Audio 600.1 amp
Diamond Audio 15" M6MKII
Pyramid PB881X 4 CH. Amp

Replies:

Posted By: russ lund
Date Posted: October 02, 2004 at 10:53 AM

What size is your sub?Just plug thoseT/S parameters into a program like bassbox pro or a slide rule(yuk) and it will give you the proper box size and graph out your spkr performance.If you just find a reputable dealer he'll help you too.

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BigDog

Posted By: thapimpfromchi
Date Posted: October 02, 2004 at 11:19 AM

i'm not looking for a box size, im askin what are the few things u always wanna look for when it comes to a woofer. Im almost positive u want the lowest Fs. but what else i should look for, thats what i want to know.

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1990 Honda Civic HB:
Clarion DXZ545MP H.U.
2- 6.5" Power Acoustik interiors
Diamond Audio 600.1 amp
Diamond Audio 15" M6MKII
Pyramid PB881X 4 CH. Amp

Posted By: Steven Kephart
Date Posted: October 02, 2004 at 1:48 PM

Not necessarily. The Fs defines how low the speaker can play compared to another speaker in a given alignment. But a vehicle has a natural boosting of low frequencies. So using a subwoofer with an extremely low Fs (like would be found in a home audio sub) will give you too much low end. Also, a low Fs must come at the cost of something else. If you want a lot of low end extention, you will have a sub that either requires a larger enclosure or is less efficient. From what it looks above, they gave up efficiency (Spl is a little low).

Another thing you don't necessarily want is that high of a Qts. It gets that high Q from such a weak motor, which can be seen from the high Qes. Because of this high Q, the sub would only work well in a sealed enclosure. And you will never get an alignment lower than the Qts, so you will never get a .707 alignment (maximally flat) or lower.

Vas gives you an idea of the enclosure size needed. The one above is very large for a 10" sub, a little large for a 12" sub, and not too bad for a 15" sub.

I would guess from the parameters you are showing us a cheap 15" home audio sub. Am I right?

Steven Kephart

Adire Audio

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Posted By: thapimpfromchi
Date Posted: October 03, 2004 at 12:33 AM

lmao. no sir, a very very cheap 12" Car audio subwoofer.

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1990 Honda Civic HB:
Clarion DXZ545MP H.U.
2- 6.5" Power Acoustik interiors
Diamond Audio 600.1 amp
Diamond Audio 15" M6MKII
Pyramid PB881X 4 CH. Amp

Posted By: thapimpfromchi
Date Posted: October 03, 2004 at 12:37 AM

and unfortunately, it just so happens to be the one in my car.

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1990 Honda Civic HB:
Clarion DXZ545MP H.U.
2- 6.5" Power Acoustik interiors
Diamond Audio 600.1 amp
Diamond Audio 15" M6MKII
Pyramid PB881X 4 CH. Amp