MJK’s Jordan JX92S OB with a Goldwood GW-1858 Woofer in an H Frame - Page 6 - diyAudio
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Old 21st October 2008, 11:06 PM   #51
Aengus is offline Aengus  Canada
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Maxro said:

Quote:
I suppose one pair of drivers isn't worth their effort. Perhaps a group buy is in order?
Hey, Max, I might reconsider.

We could always ask an Aussie member to do the buy and ship them to Canada. It wouldn't be too onerous if they just had to accept the carton as shipped to them, and readdress it to a Canadian address.

Come to think of it, I've got some (somewhat distant) relations in Australia. If there's insufficient response here, let's get together and see what we can work out.

Regards.

Aengus

P.S. I got busy so haven't done anything with the EVs yet. And I too apologize for the O/T.
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Old 22nd October 2008, 04:52 AM   #52
ttan98 is offline ttan98  Australia
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Spoke to the sales personnel at Major Music in Aussie land.

F120A is out of stock, takes 3-4 weeks delivery, the Internet price incorrect, correct price AUD$241.
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Old 22nd October 2008, 06:12 AM   #53
Aengus is offline Aengus  Canada
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Quote:
correct price AUD$241.
Which is about US$161 - Madisound lists them at US$227. Still a good deal.

[edit] ttan98, thanks for checking.
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Old 23rd October 2008, 02:30 AM   #54
maxro is offline maxro  Canada
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Quote:
Originally posted by Aengus

We could always ask an Aussie member to do the buy and ship them to Canada. It wouldn't be too onerous if they just had to accept the carton as shipped to them, and readdress it to a Canadian address.
Ah, but if we ordered them directly, we would circumvent the Australian sales tax.
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Old 23rd October 2008, 11:04 AM   #55
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Would these work in an H frame?

http://www.alphard.pl/en/product/79/61

short info: Woofer with a paper cone on a stiff suspension. Ventilated magnet.
Power [ Watt Max ] 250 W
Power [RMS] 125 W
SPL [dB] 97 dB
Impedance 4 ohm
Frequency range [Hz] 27-2500 Hz
Cone material Cellulose
Dumper Textil
Frame Steel
Speaker dimension [inch/mm] 18" / 460 mm
Cone diameter 383 mm
Mounting depth 194 mm
Coil diameter [inch / mm] 2,5" / 65 mm
Coil carcass Aluminium
X-max [mm] 4 mm
Magnet[mm] 169 mm x 20 mm
Weight 5,84 kg
Fs [Hz] 27 Hz
Qts 0,46
Qms 4,46
Qes 0,51
Search:QUALITY POLICY
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Old 23rd October 2008, 01:42 PM   #56
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Sure I Think they'd be fine. The specs look good. I'd like to see a slightly higher Q though. The 18" size with its huge surface area will help.

I think I'm going to head in a different direction and try this driver:

http://www.usspeaker.com/beyma%20sm115k-1.htm

run by a subwoofer amp. That way the low Q won't be a problem for my OB with its healthy xmax, low FS and much higher motor strength vs moving mass compared to the high Q drivers normally used in OB. Downside is: $500 for a pair.
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Old 23rd October 2008, 02:25 PM   #57
MJK is offline MJK  United States
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dublin78,

If it was me, I would look for a driver with a Qts of about 1.0. I am afraid that the lower Qts of the driver you selected might compromise the bass performance unless you use some EQ. To really see how it would work I would model it before spending any money and let the calculated results guide your choice. If you look at the design studies on my site you will see the impact of lower Qts on bass performance and the differences between OB, U frame, and H frame responses.
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Old 23rd October 2008, 02:28 PM   #58
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That reminds me. Aren't the woofers on Jamo's R909 low Q units? I wonder how they did it.
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Old 23rd October 2008, 03:12 PM   #59
vaughn is offline vaughn  United States
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I am quite enamored with the open baffle speaker and have an off brand 18" woofer
I would like to experiment with(GLI Pro ZX-18200, looks like it might be a Goldwood oem).

I am curious which active crossover you are using, Martin. I would like to have the flexibility of
being able to experiment with different drivers for the top end. I have been doing some research
in an attempt to find a solid recommendation but it seems that most avoid using them.
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Old 23rd October 2008, 03:22 PM   #60
MJK is offline MJK  United States
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vaughn,

I am using a dBx DriveRack PA crossover. It will run two or three way with slopes between 6 and 24 dB/octave, can strore quite a few configurations for recalling later, and has some EQ cabability.

http://www.parts-express.com/pe/show...number=246-170

I am sure it is not the best but it seems to work well for me and I have been happy with the performance. The direct competitor is the Behringer DCX unit which has similar features and a computer control hook up which would be really nice. Both of these use XLR connectors and my three identical 200 W SS amps and my SS preamp also have XLR connection capabilities. I picked up eight 10' long XLR cables from an e-Bay store at a great price and they have made connecting and reconfiguring really a snap.
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