WTB 15" or 18" high qt. drivers - diyAudio
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Old 28th January 2009, 08:47 PM   #1
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Default WTB 15" or 18" high qt. drivers

Hi
Looking to buy 4 15" or 18" drivers for an open baffle speaker I'm building. I would like these drivers to have a 'qt' around .8-1.0 to avoid necessary low end boost. High eff. of 93db+ preferred. Thanks
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Old 29th January 2009, 12:55 AM   #2
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When you find them let me know please, although I may not be able to afford them.
High efficiency and high Qts seem to be mutually incompatible. and published data specs always seem to pick the loudest part of the audio spectrum, where-as i would only be interested in the bottom 3 octaves at most
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Old 29th January 2009, 01:49 AM   #3
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Closest thing I can find that meets the requirements is the Goldwood GW-1858. Published specs seem to be comfirmed by MJK on his site(qt & average db). Appear to be proven in use. I see several small magnet 15" & 18" drivers on ebay , but they have minimal specs and do not have a track record. I'll most likely use the Goldwoods if nothing else comes along
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Old 29th January 2009, 02:00 AM   #4
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Just ran that driver thru X=baffle very similar results to the 12inch I i have on hand, which is a very cheap driver clearance at $19 each
( although I did pay $25 )
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Old 29th January 2009, 02:32 AM   #5
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I did see some 12 clearance drivers at Partsexpress not to long ago. High qt , 89db? Would most likely work ,but I'm using them with 15" Hawthrone coax's and I would have to believe 2 15 alpha's or 18" Goldwoods would can give more output (w/shelving) down low?? Now 3 of those 12" might work , but parrallel imped is a concern.
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Old 29th January 2009, 03:55 AM   #6
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I'll be using 4 a side series parallel and sealed subs below 40hz.
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Old 11th February 2009, 01:25 PM   #7
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found these on ebay;

Parameter Value Unit/Notes
Effective piston area (Sd) 873 cm2
Free air resonance (Fs) 34.9 Hz
DC resistance (Re) 7.7 ?
Mechanical Q factor (Qms) 5.97
Electrical Q factor (Qes) 0.91
Total Q factor (Qts) 0.79
Voice coil inductance (Le) 2.1 mH/milli-Henrys
Equivalent air volume (Vas) 288.5 Liters
Moving mass (Mms) 97.7 Grams/Mmd + air load mass
Suspension compliance (Cms) 213.42 M/N/micro-Meters per Newton
Force factor (Bl) 13.42 Tm/Tesla-Meters
Sensitivity (SPLref) 96.5 dB/reference 8?/2.83Vrms

http://cgi.ebay.com/ws/eBayISAPI.dll...:X:RTQ:US:1123



Maybe you could model these?
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Old 11th February 2009, 07:05 PM   #8
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this site for the Download

http://www.mh-audio.nl/sql7/ViewDownloadFiles.asp

It's a zip file
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Old 11th February 2009, 07:12 PM   #9
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Also needed is Vas and X-Max to do the calculation

Probably no better or worse than the Eminence, Qts is a little low for an OB speaker. and they are a little too expensive to experiment on.
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Old 11th February 2009, 07:47 PM   #10
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Actually , the price is for 2 with shipping. They also have a listing , which is 'best offer'. I offered $100 with shipping , and it was accepted. I'll let you know when they arrive. See if I can get more t/s specs.
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