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Old 15th March 2010, 08:38 AM   #1
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Default 2x Peerless SLS 315 Sub

I`m planing too build a sub woofer using my two Peerless SLS 315.
http://www.madisound.com/catalog/PDF...ess/830669.pdf

Just want to know what you think considering box size and tuning.

(three different tunings because Im planing too use 3 BR pipes)
Click the image to open in full size.

Im hoping that with room gain and 3-6dB EQ this will play within at least -10dB @ 20Hz.

Another alternative would be Acoustic Valve(if someone can explain how it works)
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Old 16th March 2010, 12:43 AM   #2
bjorno is offline bjorno  Sweden
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[QUOTE=urkain87;2119515]I`m planing too build a sub woofer using my two Peerless SLS 315..

..Just want to know what you think considering box size and tuning..

QUOTE]

Hi ukraina87,

Looks ok,, for more hints see the zipped picture:

b
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File Type: zip Peerless830669_T-TQWT_portedbox.zip (272.7 KB, 178 views)
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Old 16th March 2010, 05:03 AM   #3
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I have too say, Im impressed with the effort you have out intoo helping me
If i understand this right the image is a TL design with quarter wave tuning at about 35Hz(28Hz with stuffing and narrowing line)?

But the enclosure becomes really big with this design...
Compareing graphs from a simple BR with the same volume for one driver I would get about the same result. Although i wil take this into serious consideration

Can i reduse the total volume of the box while still maintaning the length of the line with an isobarrik configuration?
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Old 16th March 2010, 11:45 AM   #4
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by urkain87 View Post
..I have too say, Im impressed with the effort you have out intoo helping me
If i understand this right the image is a TL design with quarter wave tuning at about 35Hz(28Hz with stuffing and narrowing line)?..
Thank you for the nice words but IME the tools I use is very easy to use, then it's only a cut and paste process lasting a couple of minutes.

Yes, it's a Tapped Tapered Quarter wave Tube or a Tapped TL as you wish.

Quote:
Originally Posted by urkain87 View Post
..But the enclosure becomes really big with this design...
Compareing graphs from a simple BR with the same volume for one driver I would get about the same result. Although i wil take this into serious consideration..
The only difference is that the T-TQWT widens the BW by almost an octave lower.

Quote:
Originally Posted by urkain87 View Post
..Can i reduse the total volume of the box while still maintaning the length of the line with an isobarrik configuration?..
You are right, just cut the CSA: s in half for an isobaric T-TQWT while maintaining the length as before. See the picture:

b
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File Type: gif Isobaric_Peerless830669_T-TQWT_portedbox.GIF (144.6 KB, 633 views)
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Old 16th March 2010, 08:53 PM   #5
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Hmm... Looks like this might turn into a more interesting project than i expected

Now the question becomes: should i go for the TL, or a small(50L) isobarik closed box... I have done some simulations and with a closed box they will play in phase with my xxls sub.

hmmmmmmm....

Anyways, i need too buy some MDF now
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Old 16th March 2010, 08:59 PM   #6
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btw, what program are you using?
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Old 18th March 2010, 04:58 AM   #7
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I think this will be my final design: Reason being the box size and better flexibility than TL. Also a lack of experience with TL on my part makes the chances of success with BR way higher

Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.

Red: Closed box
Green: One BR port open
Blue: Both BR ports open
Yellow: just for reference, as i already have a xxls sub.
All in 82L boxes with isobarik configuration.

As you can see the closed system plays very well in phase with the xxls, so does the Green BR. The Blue BR i think will sound good in for party use

Questions:
Looks like i will loose 6dB SPL with isobarik, but how much max SPL will i loose?
Does isobarik reduce cone excursion due too the higher preassure levels?
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Old 18th March 2010, 01:35 PM   #8
bjorno is offline bjorno  Sweden
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[QUOTE=urkain87;2123133]..Reason being the box size and better flexibility than TL..[QUOTE]

Hi urcain87,

The impact of the box size is a defendable reason but the flexibility (and SQ performance) IMO: No way! See the first picture here below.

[QUOTE=urkain87;2123133]..The Blue BR i think will sound good in for party use ..[QUOTE]

Once the Qts for a driver is at or over 0.5, its not really suited for a BR box (the SQ will be low) unless making the Speaker system Aperiodic or applying Qm damping, LT or by using a negative resistance amplifier. Se the second picture.

b
Attached Images
File Type: gif Peerless-830669-T-TQWT.GIF (56.2 KB, 141 views)
File Type: jpg Peerless830669_Isobaric_portedbox.JPG (625.2 KB, 142 views)

Last edited by bjorno; 18th March 2010 at 01:41 PM.
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Old 20th August 2011, 09:12 AM   #9
Luke is offline Luke  New Zealand
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Quote:
Originally Posted by urkain87 View Post
I think this will be my final design: Reason being the box size and better flexibility than TL. Also a lack of experience with TL on my part makes the chances of success with BR way higher


Hi Urkain87, did you ever build this sub, how does it sound?
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Old 20th August 2011, 04:05 PM   #10
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Hi, i found another use for the SLSs, an open baffle configuration.

They sound very clean(low distortion) even at high excursion, and they have a very SMOOTH frequency response all the way up too about 1khz.

I did use one as a woofer in my car for a while. sounded great, but needs a big 50L+ box. Mabe even 80L per driver.

Here is a link:
Fast, fun, Inexpensive OB project
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