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Old 17th March 2011, 04:03 AM   #11
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No . I haven't read the 'holy' books ,but it is well known that is better in having the ports placed in the back or bottom . It depends . If you are somehow constrained and can't place
the speakers at least 1' from the wall , after rejecting the port on the bottom or needing some extra bass output ,then you can put it on the front baffle ....but that's the last option ,not the first ( for sound quality ) .
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Old 17th March 2011, 04:18 AM   #12
tinitus is offline tinitus  Europe
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will the 6" play down to 50hz, and have no xover ?

maybe try to sim the closed version with slightly smaller volume
rolloff will be a bit lower, a nicely 'rounded'

remember that it should be 6db down at xo point to woofer
woofer should likewise be 6db down

maybe also take a look at xmax figures
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Old 17th March 2011, 04:19 AM   #13
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You'll get plenty of bass with one 12 inch woofer per enclosure, going isobaric is a waste unless you are constrained by size requirements. If you want incredible bass, double your enclosure volume and install both the woofers in the usual manner.
Here is what I'm building at 4.3 cubic feet, 120 liters total volume with 3.9 cubic feet, 110 liters reserved for the woofers. Bass will be in the mid 20s.
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File Type: jpg Enclosures with Outriggers.jpg (22.4 KB, 85 views)
File Type: jpg DSCF0427.jpg (542.2 KB, 86 views)

Last edited by AEIOU; 17th March 2011 at 04:44 AM.
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Old 17th March 2011, 04:24 AM   #14
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Quote:
Originally Posted by Jameslc View Post
Hi all i am building a 3 way speaker system and i need help designing it so it looks cool and looks one of a kind if you know what i mean
(i will attach pics of sketch up designs)

Speakers i am using
Peerless 12' SLS 830669 x2 (Iso-Barik Clamshell)
Peerless 6.5' Mid Woofer 831916
Vifa 1" Silk Dome Tweeter D27TG-45-06
Woofer is too high and tweeter/midrange should be aligned vertically.
Depending on where you crossover, a high mounted woofer will give you two arrival times at your sitting position. It is called floor bounce cancellation.
Align the midrange and tweeter vertically for better stereo imaging. No need to port the midbass either, unless you plan on letting it run full all the way to its lower limit. You've got big woofers there, why port the midbass?

Last edited by AEIOU; 17th March 2011 at 04:26 AM.
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Old 17th March 2011, 04:27 AM   #15
tinitus is offline tinitus  Europe
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hey, still no drivers ? you are as slow as me
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Old 17th March 2011, 04:38 AM   #16
AEIOU is offline AEIOU  United States
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Quote:
Originally Posted by tinitus View Post
hey, still no drivers ? you are as slow as me.
I started on the project late summer of last year. The shop where I am allowed/privileged to work is not insulated or air conditioned. It gets uncomfortably cold in there there this time of year, almost like working inside a refrigerator. I already suffered two colds and a cough this winter. I've been delaying my shop time until the weather warms up just a bit more.
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File Type: jpg DSCF0494.jpg (425.7 KB, 28 views)
File Type: jpg DSCF0514.jpg (616.8 KB, 20 views)
File Type: jpg VIFA D27TG-35.jpg (27.6 KB, 13 views)

Last edited by AEIOU; 17th March 2011 at 04:40 AM.
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Old 17th March 2011, 04:40 AM   #17
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Mmmmmm h
That woofer has a too closed basket frame !
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Old 17th March 2011, 04:49 AM   #18
AEIOU is offline AEIOU  United States
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Quote:
Originally Posted by picowallspeaker View Post
Mmmmmm h
That woofer has a too closed basket frame!
.
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File Type: pdf M30WO-49-08 specs.pdf (107.3 KB, 12 views)
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Old 17th March 2011, 04:54 AM   #19
Jameslc is offline Jameslc  Australia
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Quote:
Originally Posted by AEIOU View Post
You'll get plenty of bass with one 12 inch woofer per enclosure, going isobaric is a waste unless you are constrained by size requirements. If you want incredible bass, double your enclosure volume and install both the woofers in the usual manner.
Here is what I'm building at 4.3 cubic feet, 120 liters total volume with 3.9 cubic feet, 110 liters reserved for the woofers. Bass will be in the mid 20s.
yes i am constrained by size because to get the same responce i would have to have a 200litre box but with iso barik i only have to have i think it is about 140
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Old 17th March 2011, 04:56 AM   #20
Jameslc is offline Jameslc  Australia
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Quote:
Originally Posted by AEIOU View Post
Woofer is too high and tweeter/midrange should be aligned vertically.
Depending on where you crossover, a high mounted woofer will give you two arrival times at your sitting position. It is called floor bounce cancellation.
Align the midrange and tweeter vertically for better stereo imaging. No need to port the midbass either, unless you plan on letting it run full all the way to its lower limit. You've got big woofers there, why port the midbass?
so should i move the woofer down near the bottom of the box?

Last edited by Jameslc; 17th March 2011 at 05:07 AM.
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