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3rd September 2008, 11:27 PM
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#1 |
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diyAudio Member
Join Date: Feb 2002
Location: Sydney
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Low Q Driver
A couple of days ago I was given a pair of Panasonic SB-CH7cabs, one water damaged - drivers OK. The cabs were bi-amped (no xover inside), and 9L, some odd bandpass arrangement inside. The 10Cm woofer (Matsushita EAS-14PL74C) is interesting, FR good up to ~6KHz, but very Low Qts, ~.28. LIMP measurements give me Vas 5.4L, Qe .29, Qm 6.0, Re 4.7 Sd 78.5 The driver has a huge magnet, eff ~92dB.
The only prob is that there are some glitches in the impedance curve between 1-2KHz. WINISD sims give best results in an EBS alignment in a small cab ~4.5L, maybe best to use it as a mid driver?
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‘today… there lives alongside the twentieth century the tenth or thirteenth. A hundred million people use electricity and still believe in the magic power of signs and exorcisms” Trotsky |
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3rd September 2008, 11:29 PM
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#2 |
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diyAudio Member
Join Date: Feb 2002
Location: Sydney
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FR attached (in original box)
__________________
‘today… there lives alongside the twentieth century the tenth or thirteenth. A hundred million people use electricity and still believe in the magic power of signs and exorcisms” Trotsky |
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3rd September 2008, 11:30 PM
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#3 |
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diyAudio Member
Join Date: Feb 2002
Location: Sydney
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Impedance (this is the best plot, found it hard to get consistent results)
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‘today… there lives alongside the twentieth century the tenth or thirteenth. A hundred million people use electricity and still believe in the magic power of signs and exorcisms” Trotsky |
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3rd September 2008, 11:36 PM
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#4 |
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diyAudio Member
Join Date: Feb 2002
Location: Sydney
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Nice looking cone, I think it's poly, but not sure.
I guess my question is how would you guys use this driver? (came with a cone tweeter that has a very smooth FR from 2kHz up). I'm thinking an EBS mini monitor in 6L cab tuned to ~50Hz??? Obviously I need to do some listening to see if there are intrusive peaks in the HF...
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‘today… there lives alongside the twentieth century the tenth or thirteenth. A hundred million people use electricity and still believe in the magic power of signs and exorcisms” Trotsky |
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4th September 2008, 08:36 AM
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#6 |
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diyAudio Member
Join Date: Feb 2002
Location: Sydney
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d'oh, Fs is 67Hz
__________________
‘today… there lives alongside the twentieth century the tenth or thirteenth. A hundred million people use electricity and still believe in the magic power of signs and exorcisms” Trotsky |
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4th September 2008, 08:37 AM
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#7 |
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diyAudio Member
Join Date: Jun 2007
Location: Norlane; Geelong: Victoria: Australia
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How does it compare SQ wise to those Jaycar 6 inch poly's??
I'd probably be using as a mid-range crossing low
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QUOTE" The more I know, the more I know, I know (insert maniacal laugh >here<) NOTHING" |
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4th September 2008, 08:48 AM
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#8 |
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diyAudio Member
Join Date: Feb 2002
Location: Sydney
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Hi Moondog, haven't listened yet (tomorrows job), but I think they'll be a bit too efficient to mate with the Jaycars.
PS, Altronics have a dome tweeter on special, Fs 1kHz, $20, I'll try & pick up a pair tomorrow if they've got them locally...
__________________
‘today… there lives alongside the twentieth century the tenth or thirteenth. A hundred million people use electricity and still believe in the magic power of signs and exorcisms” Trotsky |
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4th September 2008, 09:06 AM
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#9 |
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diyAudio Member
Join Date: Jun 2007
Location: Norlane; Geelong: Victoria: Australia
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I'm in the middle of a cheap Jaycar project at the moment, those 10 inch papers are better than expected but still only $20 driver, I'' also try the 12inch later in the month.
OB's are fun, quick and cheap
__________________
QUOTE" The more I know, the more I know, I know (insert maniacal laugh >here<) NOTHING" |
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4th September 2008, 09:17 AM
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#10 |
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diyAudio Member
Join Date: Nov 2003
Location: Brighton UK
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Hi,
5L/40Hz looks about right for line level EQ. FWIW cone tweeters can be not that bad, I've always liked the Peerless 2" paper cone tweeters, they are a victim of fashion. A simple first order series c/o could work well but the whole speaker would need some 10dB or so of level passive EQ to balance it out, down to ~ 100Hz, slow roll off after that. Getting the small box volumes correct for sealed / vented does not look easy, shown also is 4th and 6th order bandpass, again they need tiny box volumes and port tuning is critical, not easy.  /sreten.
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