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Old 11th November 2011, 10:13 PM   #1
Boscoe is offline Boscoe  United Kingdom
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Default Interesting PPSL sub.

So yes it's a strange shape but I wanted something the TV could sit on and it gets the sub out of the way with great SPL output too! There will be extra bracing from some offcuts I have, another great thing with this is you can fit the cutting list into one sheet of 8' x 4'. I will be building tomorrow to see how it comes out.

The driver used is the Peerless SLS-213 8" and the enclosure is 1.94m wide, 30cm tall and 35cm deep. Just 64W for max SPL.

Here are some specs...

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Thanks, there may well be very obvious flaws to this design please let me know and i'll se what I can do!
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Old 12th November 2011, 12:35 AM   #2
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an opinion:
I suspect the vents could have less area (Ap = 200) with the same length to lower the tuning a bit. I find flat past 35Hz is a bit boomy. -3db per octave from 40Hz to 20Hz works well for me.

edit: + HP at 22Hz

Last edited by revboden; 12th November 2011 at 12:51 AM.
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Old 12th November 2011, 01:44 AM   #3
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any reason you put the vents to the outside rather than close to the driver front output? Only reason I ask is , having the ports 3 feet away from the front radiation may cause some response anomalies other wise it looks cool
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Old 12th November 2011, 09:44 AM   #4
Boscoe is offline Boscoe  United Kingdom
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Quote:
Originally Posted by revboden View Post
an opinion:
I suspect the vents could have less area (Ap = 200) with the same length to lower the tuning a bit. I find flat past 35Hz is a bit boomy. -3db per octave from 40Hz to 20Hz works well for me.

edit: + HP at 22Hz
Thanks I will probably do that I will prob keep it flat though as I will be using minidsp digital crossovers hopefully so I can fine tune from there.

Quote:
Originally Posted by Top Shelf View Post
any reason you put the vents to the outside rather than close to the driver front output? Only reason I ask is , having the ports 3 feet away from the front radiation may cause some response anomalies other wise it looks cool
Yes this is prob one of the biggest compromises of this build although i plan to be sitting about 4m away from it it hopefully won't be that bad. I have simmed it at 1m with 0.5m difference from driver to port distance to the listener and it just lowers SPL about -3db at 25Hz but his is also acceptable form me as not a huge amount of content that low will be played. I also can't fit the pieces needed to make to port closer to the driver out of one sheet of wood.

Thanks
Please keep the ideas coming
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Old 12th November 2011, 10:23 AM   #5
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tuning to 30hz sounds much better than 40hz, it's a group delay thing.
I also like 27hz, and tuning below that just wants a passive radiator.

Norman
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Old 12th November 2011, 05:43 PM   #6
tb46 is offline tb46  United States
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Hi Boscoe,

How about tuning w/ two 4"I.D. cardboard tubes? Ap=162.1 and Lpt=38, for an almost identical frequency response, and easier placement of port opening.

Regards,
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