New Push-Pull 15" |
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Sheggy
Old Croc Joined: 23 May 2008 Location: London Status: Offline Points: 1989 |
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t.geessounds
Young Croc Joined: 10 May 2010 Location: US... New york Status: Offline Points: 908 |
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nice
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Oscar
Registered User Joined: 22 April 2010 Location: Laredo, Tx Status: Offline Points: 100 |
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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
Old Croc Joined: 02 August 2004 Location: West Midlands Status: Offline Points: 4840 |
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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 |
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www.forteaudio.eu - BMS - db-Mark Processors - Lexon (SAE)
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djeddie
Old Croc Joined: 26 April 2004 Location: Bristol Status: Offline Points: 4125 |
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That is a nice box Tony. And seems smaller in real life than the description!
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Chas n Dave : it's like Drum and Bass but with beards. E=mc² ±3dB
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Edd Jordan
Young Croc Joined: 10 January 2008 Location: United Kingdom Status: Offline Points: 1364 |
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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?
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I do a sideline in ply wood wheels.
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overdrive
Registered User Joined: 13 July 2004 Location: Netherlands Status: Offline Points: 21 |
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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
Young Croc Joined: 10 January 2008 Location: United Kingdom Status: Offline Points: 1364 |
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Man thats tidy for no eq
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I do a sideline in ply wood wheels.
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ermita
Young Croc Joined: 19 August 2010 Location: Surrey, TW10 Status: Offline Points: 1266 |
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+1
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overdrive
Registered User Joined: 13 July 2004 Location: Netherlands Status: Offline Points: 21 |
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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... 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
Registered User Joined: 13 July 2004 Location: Netherlands Status: Offline Points: 21 |
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Some pics from this afternoon, some subs can do a lot of damage measuring with pink noize
25meters away, other side of house: |
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MarjanM
Old Croc Joined: 10 February 2005 Location: Macedonia Status: Offline Points: 7810 |
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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.
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Marjan Milosevic
MM-Acoustics www.mm-acoustics.com https://www.facebook.com/pages/MM-Acoustics/608901282527713 |
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