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New Push-Pull 15" |
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stevie 
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Joined: 16 March 2008 Location: Dorchester Status: Offline Points: 425 |
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 Posted: 28 July 2013 at 8:15pm |
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What do you think is the usable upper frequency limit for this design (crossing over to a midrange driver, for example)?
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Tony Wilkes
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Joined: 02 August 2004 Location: West Midlands Status: Offline Points: 4840 |
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Posted: 28 July 2013 at 8:24pm |
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In a normal box that driver sounds OK up to over 500hz but I suspect the front chamber and the angled drivers* will lower this, no idea what that Freq will be. Over to you Joost :)
Looking at the graph I suspect at least 200 hz * Causing a nice big phase cancellation dip. Tony
Edited by Tony Wilkes - 28 July 2013 at 8:26pm |
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www.forteaudio.eu - BMS - db-Mark Processors - Lexon (SAE)
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overdrive
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Joined: 13 July 2004 Location: Netherlands Status: Offline Points: 21 |
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Posted: 28 July 2013 at 9:41pm |
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Well all i've done so far are measurements and low-level listening so I can't give a proper anwser on that one yet..
Hope to do some testing asap with diffenent kind of music with a more serious amplifier and higher SPL at a more suitable location :)
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Rojoh
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Joined: 06 June 2012 Location: Norway Status: Offline Points: 3 |
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Posted: 31 July 2013 at 11:33pm |
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Usable bandwidth is one thing. PP-coupling is another. Would be fun with impressions of PP vs. "normal". Personally I was convinced when flipping one driver in my JBL 4638-cabinet - 2226H loaded.
Edited by Rojoh - 31 July 2013 at 11:34pm |
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_djk_
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Joined: 23 November 2004 Location: United States Status: Offline Points: 6002 |
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Posted: 01 August 2013 at 2:42am |
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Art Welter took a standard ported dual 12 enclosure (LAB 12 drivers) and ran it up to 400W.
Flipping one driver (and connecting it properly) reduced 2nd harmonic distortion by 30dB, 4th harmonic by 20dB.
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djk
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Art Welter
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Joined: 15 December 2011 Location: New Mexico Status: Offline Points: 15 |
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Posted: 08 August 2013 at 9:29pm |
The results of my PP to normal tests were interesting: http://www.diyaudio.com/forums/subwoofers/191833-push-pull-vs-normal-distortion-compared.html Although the second harmonic was reduced at some frequencies, at others it was not, and since the third harmonic sometimes rose higher with PP, overall distortion was not always reduced. At high power, low frequency, where excursion is the largest contributing factor to distortion, the overall distortion was barely reduced at all in the front loaded Lab 12. The reversed Lab 12 had a fair amount of noise from it's cooling vent, which was annoying. Art |
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djtuffer
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Joined: 02 April 2006 Location: United Kingdom Status: Offline Points: 741 |
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Posted: 13 August 2013 at 9:55pm |
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I have been playing with a logic systems IS26 cab which is basically a small reflex box with the woofer slot loaded. Only a single driver so not push pull. There is output up to about 300hz but it doesn't sound nice to my ears over about 150hz. That was tested with two different drivers with similar results.
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bob4
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Joined: 29 February 2004 Location: Finland/Germany Status: Offline Points: 1782 |
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Posted: 31 October 2015 at 6:57pm |
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I found This thread searching for PPSL designs and General info. Sadly since Tony passed away This project seems to have been abandoned unfinished. In his posts Tony stated that he Wanted To Test and prove his design before publishing the Plan, but Never Got To that point. Tony Did share the cad file With a few People however.
Is There anyone Around that has the Plan, and Would be Kind enough To share it? If not, I'll do My own version, but it Would be nicee To Try tonys design and continue the discussion onhere....... sry about weird capitalisation, im writing This on My Phone..... |
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dlyxover
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Joined: 14 June 2007 Location: Liverpool Status: Offline Points: 1503 |
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Posted: 31 October 2015 at 7:48pm |
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try contacting bee on this forum.
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In the Truth there is no news, and in the News there is no truth
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bob4
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Joined: 29 February 2004 Location: Finland/Germany Status: Offline Points: 1782 |
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Posted: 01 November 2015 at 1:30pm |
will do that, thanks for the hint! |
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bob4
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Joined: 29 February 2004 Location: Finland/Germany Status: Offline Points: 1782 |
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Posted: 10 November 2015 at 11:21am |
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so no one can help me on this one?
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sn95
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Joined: 10 March 2013 Location: USA Status: Offline Points: 351 |
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Posted: 10 November 2015 at 5:36pm |
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Look in diy audio forum i have seen some plans ther
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_djk_ wrote: