Has anybody ever mounted car speakers in a bookshelf application? - AVS Forum
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post #1 of 10 Old 04-12-2012, 07:07 PM - Thread Starter
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I have an unused set of Alpine 6.5" Type-S speakers that I am thinking about making small bookshelf boxes for. Has anybody done this? I know they are 4 ohm and may tax my receiver a bit more, but I enjoyed the way they sounded in my car before and want to try it. I can't find any T/S specs, so I don't know how big or whether or not to use a port. Any input?
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post #2 of 10 Old 04-12-2012, 07:15 PM
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I used a pair of alpine 6x9s as a set of DJ monitors for a couple of years. Not much bass because the enclosure is way too small, but they got loud and sounded good. I'll post a pic when I get home.

 

Originally Posted by Bill Fitzmaurice:
It's also the very sort of Voodoo Engineering that should never be done.

 

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post #3 of 10 Old 04-13-2012, 09:08 AM
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Did the same thing years ago with some 6x9s in a sealed box that couldn't have been more than .5 cf, probably more like .3, and got the same result -- lots of loud, not a lot of bass, but fine for a garage system or low-level or background listening.
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post #4 of 10 Old 04-13-2012, 09:30 AM - Thread Starter
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Do you guys think a port would help?
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post #5 of 10 Old 04-13-2012, 09:39 AM
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Quote:
Originally Posted by JohnnyWash1 View Post

Do you guys think a port would help?

Nope, seal em up and augment with a sub. best bet. Cant imaging a pair of 6x9's getting anywhere below 80hz with any kind of quality. Crossed over at 80 or 100hz to a sub and they will be much happier. So will you !! Enjoy KG


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post #6 of 10 Old 04-16-2012, 07:02 AM
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ive had some seas lotus tweets paired with a set of peerless XLS 6.5's in a box I made in college. Using a diamond XO, haha its a mess of crap but they wont blow, until your ears do.

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post #7 of 10 Old 04-16-2012, 10:04 PM - Thread Starter
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Well, in case anybody is following this thread, I did mount them up today to compare. I had an old pair of taller Sony bookshelf speakers lying around that had been rebuilt about 15 years ago. The speakers consist of a 1" tweeter and a 6.5" midrange; there is also a 6.5" passive radiator. The woofers were replaced 15 years ago with Radio shack woofers--the tweeters are original. To compare, I swapped out the woofer in one speaker with an Alpine Type S 6.5" coaxial speaker and compared to the other. While neither speaker had an amazing amount of bass, the Alpine unit was much, much clearer and full sounding. I will be swapping the other and using these as outdoor garage speakers, probably with a subwoofer tucked away somewhere.
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post #8 of 10 Old 04-16-2012, 11:54 PM
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Quote:
Originally Posted by JohnnyWash1 View Post

Do you guys think a port would help?

No.

The right way to make a car speaker would be a soft suspension so you get good efficiency. That's going to cause a large increase in both low frequency cut-off and Q (so you'll get a mid-bass hump) when you put it in a small box.

You'd also start with a high low-frequency cut-off to compensate for cabin gain so that would be especially bad.
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post #9 of 10 Old 04-17-2012, 03:03 PM
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Quote:
Originally Posted by Drew Eckhardt View Post

No.

The right way to make a car speaker would be a soft suspension so you get good efficiency. That's going to cause a large increase in both low frequency cut-off and Q (so you'll get a mid-bass hump) when you put it in a small box.

You'd also start with a high low-frequency cut-off to compensate for cabin gain so that would be especially bad.

That's a pretty big generational. Not all car audio drivers are made the same.
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post #10 of 10 Old 04-17-2012, 03:39 PM
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Quote:
Originally Posted by Manic1! View Post

That's a pretty big generational. Not all car audio drivers are made the same.

Sure, but it's illustrative.

These guys

http://www.audiosavings.com/products...3/SC-6903.aspx

have Fs 47 and Vas 29 liters

with Vas very nearly 1 cubic foot. In a 1 cubic foot box you'd get Fb 66 and Qb 1.16.

Trying for a normal .5 cubic foot "book shelf" sized box you'd net Fb 144 Qb 2.54.

The right answer here would be for the OP to measure his Thiele-Small parameters and see how they'd work.

Back of the envelope you could say

Vas' = Vas * Vb / (Vas + Vb)
Fb = Fs sqrt(Vas/Vas')
Qb = Qts sqrt(Vas/Vas')
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