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Old 6th September 2003, 10:43 PM   #1
rho is offline rho  Belgium
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Question Enclosure size Peerless CSC 176 H (ported)

Does anyone have what size enclosure this driver works best in.
I need good bass-performance since I won't use a dedicated subwoofer.

I was thinking about 32liters (1.13 cu ft) ported to 38.5Hz. But I was told not go go over 25 liters (0.9 cu ft) to keep the group delay within reasonable proportions.

Thanks for helping out a newbee.
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Old 7th September 2003, 12:58 AM   #2
Bose(o) is offline Bose(o)  Canada
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I believe there was a thread discussing group delay and, I also believe that one post read something like this: "Group Delay is not necessary unless you are timing x...."

So, is group delay that important? Do you know what group delay is? Have you built speakers with "wack" delay and others with fairly smooth delay? What are your thoughts on the two?
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Old 7th September 2003, 03:10 AM   #3
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Default Re: Enclosure size Peerless CSC 176 H (ported)

Quote:
Originally posted by rho
Does anyone have what size enclosure this driver works best in.
I need good bass-performance since I won't use a dedicated subwoofer.

I was thinking about 32liters (1.13 cu ft) ported to 38.5Hz. But I was told not go go over 25 liters (0.9 cu ft) to keep the group delay within reasonable proportions.

Thanks for helping out a newbee.
Do you have the T/S parameters? I don't have this driver in my DB.
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Old 7th September 2003, 09:33 AM   #4
rho is offline rho  Belgium
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@Bose: I have competed in car-audio SPl competitions. The boxes build there have really wacko specs. Group delay is awefull. And they sound realy bad. There's not one note that hits in pace with the rest of the music. But these are extreme examples and those boxes are not meant for listening.

@roddyama:
Znom = 8ohm
Pe = 70W
Fs = 39hz
Re = 6.2ohm
SPL = 88dB
BL = 6.4
L = 1.4mH
Sd = 143cm²
Mms = 13.5g
Vas = 35L
Cms = 1.23mm/N
Qes = 0.50
Qms = 2.23
Qts = 0.41
Xmax = 3.5mm (one way)
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Old 7th September 2003, 03:24 PM   #5
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I use Bass Box Pro to figure my boxes. I come up with the same 32l box as you do. The f3 of the speaker will be 44Hz but the output is only 6db down at ~34Hz so room gain could extend the output lower depending on speaker placement. The port is 63.5mm in diameter and 178.2mm long. The port velocity can get a little high so you might think about a flared port ~200mm long. The box should be lined on all sides.

The group delay should not be an issue. The highest group delay comes in in the lowest octave due to the port output. There is no way around this unless you went to a sealed box. A smaller box does very little to help this situation.

Hope this is what you’re looking for.
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Old 7th September 2003, 07:08 PM   #6
rho is offline rho  Belgium
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Cool, this means I can build the box as I initialy intended.
My idea was with a rectangle port, the width of the box and 40mm high. That should give me 65.4cm² portarea. That plenty, I know. But can this do any harm? I that a way too big of a port could be not such a good idea, but this one isn't even 1/2 Sd. So I guess that's within the "normal" range. (I'm used to build subwoofer enclosures for car-audio applications. That what I base my idea on.)

What do you think about 3/4" (old) pine to build the enclosure with?

Thanks for the great help!
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Old 7th September 2003, 09:20 PM   #7
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I would stick with the round port as I suggested above. A rectangular port of 65.4cm² would have to be longer then the box is deep.

My first choice for materials to build the box would be 3/4" MDF and next would be marine plywood. If you must use solid wood, I would go with a heavier wood like oak or maple. Pine is a bit too light. Than, you'll always have the dimentional issue with solid wood and the possibility checking, cracking, or warpping.
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Old 7th September 2003, 10:30 PM   #8
Bose(o) is offline Bose(o)  Canada
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Quote:
Originally posted by rho
@Bose: I have competed in car-audio SPl competitions. The boxes build there have really wacko specs. Group delay is awefull. And they sound realy bad. There's not one note that hits in pace with the rest of the music. But these are extreme examples and those boxes are not meant for listening.


This is why I HATE listening to the guys with Sony Xplods, Pioneers, etc, driving around with badly paced steps of bass...BOOOM BOOOM! I usually run down into my treated basement (listening room) and start up some Eric Clapton's Tears in Heaven on my OB speakers.
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Old 8th September 2003, 07:47 PM   #9
rho is offline rho  Belgium
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Old 8th September 2003, 07:51 PM   #10
rho is offline rho  Belgium
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Sorry, something went wrong.

@roddyama: What do you think will happen if I put a 90° bend in the port? I know there will be some turbulence, but should be kept to a minimum by increasing the portarea and rounding of the corners inside the port.

@Bose: I know. Most of those enclosures sound awefull. But those aren't ment for dB-drag racing. They are just build very badly. (and Xplods are one of the worst subs out there)
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