the perfect loudspeaker

montana · 12th March 2007, 07:03 PM

The perfect loudspeaker (looks like the added file)

I trying to build a 4 way loudspeaker consist of
2x 12'' jbl paper cones
2x 7'' scan speak 18W/8545-00
2x 3'' ATC dome mid ATC SM75-150S
1 tweeter the famous scan speak ring radiator R2904/700000
Xo Frequencys 150 500 3000

Need help with passive xo !!!

Vikash · 12th March 2007, 08:11 PM

Well, you're not going to find help for a 4 way passive xover in the fullrange forum!

Andersonix · 12th March 2007, 08:21 PM

The subject heading is also misleading (and pretentious). Good luck!

Tenson · 12th March 2007, 08:24 PM

Get all the drivers, put them in the cabinets and take measurments. Once you have frequency responces (on and off-axis) for each driver you can start to look at crossover values to achive the Xover points you want.

wigginjs · 12th March 2007, 08:25 PM

This should be obvious, but I feel like it's necessary to credit the picture to ShinOBIWAN. Also, to me "perfect" is synonymous with saying this loudspeaker would have completely ideal characteristics for reproduction of the 20Hz-20KHz frequency range, be an infinitely small point source, and be omni-directional. I don't think the loudspeaker you are describing meets these characteristics.

454Casull · 12th March 2007, 09:15 PM

Quote:

Originally posted by m0tion
This should be obvious, but I feel like it's necessary to credit the picture to ShinOBIWAN. Also, to me "perfect" is synonymous with saying this loudspeaker would have completely ideal characteristics for reproduction of the 20Hz-20KHz frequency range, be an infinitely small point source, and be omni-directional. I don't think the loudspeaker you are describing meets these characteristics.

I don't think it has to be omnidirectional from 20-20kHz, just constant directivity. Omni works, of course, but so does 90x90, and is more efficient to boot.

adason · 12th March 2007, 09:46 PM

Quote:

The perfect loudspeaker

there is no such thing

LineSource · 12th March 2007, 11:02 PM

WMTMW offers exceptional vertical and horizontal dispersion.
A 4-way using 1st order crossovers is often the top design.
A 3-way using 3rd order crossovers is often the volume design.

Rockport Hyperion 13", 6", 28mm dome

LineSource · 12th March 2007, 11:05 PM

WMTMW offers exceptional vertical and horizontal dispersion.
A 4-way using 1st order crossovers is often the top design.
A 3-way using 3rd order crossovers is often the volume design.

Rockport Arrakis 15" on side, 8", 5, dome

ShinOBIWAN · 12th March 2007, 11:25 PM

Quote:

Originally posted by m0tion
This should be obvious, but I feel like it's necessary to credit the picture to ShinOBIWAN. Also, to me "perfect" is synonymous with saying this loudspeaker would have completely ideal characteristics for reproduction of the 20Hz-20KHz frequency range, be an infinitely small point source, and be omni-directional. I don't think the loudspeaker you are describing meets these characteristics.

Thanks m0tion.

I'm not sure this guys intentions are honest, he's joked around in the UKfest07 website:

http://uk.diyaudio.com/festival07/signup.asp

12th March 2007, 08:11 PM	#2
Vikash diyAudio Moderator Emeritus Join Date: May 2003 Location: UK	Moved Well, you're not going to find help for a 4 way passive xover in the fullrange forum! __________________ "The human mind is so constituted that it colours with its own previous conceptions any new notion that presents itself for acceptance." - J. Wilhelm. (But I still think mine sounds better than yours.)

12th March 2007, 08:25 PM	#5
wigginjs diyAudio Member Join Date: Dec 2003 Location: Columbia, SC	This should be obvious, but I feel like it's necessary to credit the picture to ShinOBIWAN. Also, to me "perfect" is synonymous with saying this loudspeaker would have completely ideal characteristics for reproduction of the 20Hz-20KHz frequency range, be an infinitely small point source, and be omni-directional. I don't think the loudspeaker you are describing meets these characteristics. __________________ The Four Chairs DIY Home Theater

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12th March 2007, 08:21 PM	#3
Andersonix diyAudio Member Join Date: Jan 2004 Location: Silicon Valley	The subject heading is also misleading (and pretentious). Good luck!

12th March 2007, 08:24 PM	#4
Tenson diyAudio Member Join Date: Feb 2006 Location: Kent	Get all the drivers, put them in the cabinets and take measurments. Once you have frequency responces (on and off-axis) for each driver you can start to look at crossover values to achive the Xover points you want.

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