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» Termpro Audio Forum » Installer's Corner » Advanced Topics » 2 15's, comp set, and 2 8's for midbass canceling each other out?

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Author Topic: 2 15's, comp set, and 2 8's for midbass canceling each other out?
stupify
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I've got two brahma 15's and a 6.5 boston pro comp set. I was thinking about adding two koda 8's for midbass purposes. But would they cancel stuff out?

I understand I'd have to get a eq but how would this sound? The 8's would be going in a mdf enclosure in front of the seats like in the console section. As I have the pros in the doors and don't have room to put 8's also. I want midbass to go along with the two 15's and comp set. But I was wondering if I'd be able to tell they were there and how it would sound?

This is what Adireaudio's site says
Low Q Sealed 0.55 ft³ sealed (Qtc=0.6) Stuff with 8 ounces of polyfill
Mid Q Sealed 0.35 ft³ sealed (Qtc=0.7) Stuff with 4 ounces of polyfill
High Q Sealed o.25 ft³ sealed (Qtc=0.8) Stuff with 4 ounces of polyfill

I've got .64 ft³ of room. For midbass do you want low,mid or high q?

I'm not set on 2 I could have 1 also but the same thing goes for it. Would it just cancel everything out also?

I'm going to be getting another screen soon so this will be for movies also not just music.

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Alpine 9815
CDT 07 7" Mids
CDT 04 4" Midrange
(4) CDT DRT26 Tweeters
PPI EQ 31
Hifonics Zeus ZX7500
(2) Custom TC 4HP 18's
(3) Viper 2500.1 (Just Need 1 More)
(2) ODYSSEY PC2150
Optima Red Top
265 amp Iraggi alt
13.5" JL w7

Posts: 148 | From: Oklahoma | Registered: Sep 2002  |  IP: Logged | Report this post to a Moderator
Eli47
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Member # 35

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You want Mid Q of 0.7 for SQ.
As long as the individual speakers 15's 8's are set an Octave (doubling or halving of a frequency tone)apart you should be fine, keeping each in it's own enclosure.
So if you set the 15's for 40 Hz, set the 8's to 80Hz+ the 6's to 160Hz+, each X/O point slope can be adjusted.

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E.C. Wuz here

Posts: 1057 | From: Vancouver, British Columbia, Canada 'eh | Registered: May 1999  |  IP: Logged | Report this post to a Moderator
ShadowStar
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I might even go a little higher on the Q

ShadowStar

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You can't build a reputation for what you're GOING to do.. But you can build one for TALKING about it!

It's all about knowledge, love and respect.

Posts: 2579 | From: Somewhere In the Northeast | Registered: May 1999  |  IP: Logged | Report this post to a Moderator
stupify
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This is what it would look like.

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Alpine 9815
CDT 07 7" Mids
CDT 04 4" Midrange
(4) CDT DRT26 Tweeters
PPI EQ 31
Hifonics Zeus ZX7500
(2) Custom TC 4HP 18's
(3) Viper 2500.1 (Just Need 1 More)
(2) ODYSSEY PC2150
Optima Red Top
265 amp Iraggi alt
13.5" JL w7

Posts: 148 | From: Oklahoma | Registered: Sep 2002  |  IP: Logged | Report this post to a Moderator
cardinalsfan
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Member # 14660

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no offense but thats a gorgeous drawing!!

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the new setup...as of 11/11/05:

Kenwood KDC-MP828
Infinity 63.5i & Kappa Perfect 6.5" comp set
JBL GTO 75.4II
^all in a 2002 saturn sc2^

Click below...
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Posts: 1172 | From: East Texas | Registered: Feb 2004  |  IP: Logged | Report this post to a Moderator
Rrrrolla
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I am thinking of doing the exact same thing in my impala (no center console). I am pointing mine away from each other to maaaaybe get a little bit of stereo effect from them. I think it will sound pretty great.
Posts: 112 | From: NB, Canada | Registered: Mar 2004  |  IP: Logged | Report this post to a Moderator
   

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