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New Push-Pull 15"
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Sheggy View Drop Down
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Joined: 23 May 2008
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Points: 1989 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Sheggy Quote  Post ReplyReply Direct Link To This Post Posted: 08 July 2013 at 9:09pm
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t.geessounds View Drop Down
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Joined: 10 May 2010
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Points: 908 		Post Options Post Options   Thanks (0) Thanks(0)   Quote t.geessounds Quote  Post ReplyReply Direct Link To This Post Posted: 09 July 2013 at 4:24pm
nice
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Oscar View Drop Down
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Points: 100 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Oscar Quote  Post ReplyReply Direct Link To This Post Posted: 13 July 2013 at 3:43am
Sorry if I missed it, but why not place the drivers on axis to get the benefit from PPSL?
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Tony Wilkes View Drop Down
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Points: 4840 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Tony Wilkes Quote  Post ReplyReply Direct Link To This Post Posted: 21 July 2013 at 5:43pm
My thanks to Joost for sending me the images and allowing them to be shown on SP






Edited by Tony Wilkes - 21 July 2013 at 5:44pm
www.forteaudio.eu - BMS - db-Mark Processors - Lexon (SAE)
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djeddie View Drop Down
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Joined: 26 April 2004
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Points: 4119 		Post Options Post Options   Thanks (0) Thanks(0)   Quote djeddie Quote  Post ReplyReply Direct Link To This Post Posted: 21 July 2013 at 7:16pm
That is a nice box Tony. And seems smaller in real life than the description!
Chas n Dave : it's like Drum and Bass but with beards.             E=mc² ±3dB
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Edd Jordan View Drop Down
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Joined: 10 January 2008
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Points: 1358 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Edd Jordan Quote  Post ReplyReply Direct Link To This Post Posted: 21 July 2013 at 8:46pm
That looks tiny bet it needs some welly to get it going. is that a couple of bms15" i spy? 
great work as all ways Tony and great build too Joost! any data yet for us?
I do a sideline in ply wood wheels.
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overdrive View Drop Down
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Joined: 13 July 2004
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Points: 21 		Post Options Post Options   Thanks (0) Thanks(0)   Quote overdrive Quote  Post ReplyReply Direct Link To This Post Posted: 21 July 2013 at 9:50pm
Hi Edd and others,

Indeed a pair of BMS 15S330, like Tony designed it for :) 
Sounds very clean and fast response, exactly like Tony intended.
Working on finding the right EQ for B6 type allignment now together with Tony.

Did some quick measurements with Smaart. Hope to do an impedance measurement soon to validate the Fb.
LPF LR48 150Hz, no EQ:

Best, Joost


Edited by overdrive - 22 July 2013 at 11:57pm
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Edd Jordan View Drop Down
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Points: 1358 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Edd Jordan Quote  Post ReplyReply Direct Link To This Post Posted: 21 July 2013 at 11:08pm
Man thats tidy for no eq Thumbs Up
I do a sideline in ply wood wheels.
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ermita View Drop Down
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Joined: 19 August 2010
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Points: 1266 		Post Options Post Options   Thanks (0) Thanks(0)   Quote ermita Quote  Post ReplyReply Direct Link To This Post Posted: 22 July 2013 at 12:09am
Originally posted by Edd Jordan Edd Jordan wrote:

Man thats tidy for no eq Thumbs Up

+1 Clap
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overdrive View Drop Down
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Joined: 13 July 2004
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Points: 21 		Post Options Post Options   Thanks (0) Thanks(0)   Quote overdrive Quote  Post ReplyReply Direct Link To This Post Posted: 22 July 2013 at 9:30pm
Today I did an impedance measurement to check the Fb and its almost on target, need to tweak just a bit!

Also applied the B6 alignment correction. Unfortuneately Smaart crashed and lost that measurement...Ouch But can tell that with correction, it runs flat till 50Hz then droppes off.

Impedance + phase show Fb ~35Hz(phase=0):



Joost
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overdrive View Drop Down
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Joined: 13 July 2004
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Points: 21 		Post Options Post Options   Thanks (0) Thanks(0)   Quote overdrive Quote  Post ReplyReply Direct Link To This Post Posted: 22 July 2013 at 9:47pm
Some pics from this afternoon, some subs can do a lot of damage measuring with pink noize Tongue



25meters away, other side of house: 
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MarjanM View Drop Down
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Points: 7708 		Post Options Post Options   Thanks (0) Thanks(0)   Quote MarjanM Quote  Post ReplyReply Direct Link To This Post Posted: 22 July 2013 at 11:07pm
Can you measure the boxes without any HPF? That way we can see how low it really goes. It does look to me that the back chamber can do a little bit better under 55Hz. Can you put the mic right on the round port exit so can see where the back chamber is tuned? Front one seems to be spot on where it suppose to be.
Marjan Milosevic
MM-Acoustics
www.mm-acoustics.com
https://www.facebook.com/pages/MM-Acoustics/608901282527713
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