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-   -   4-5" driver 50-10,000hz (http://www.diyaudio.com/forums/multi-way/81834-4-5-driver-50-10-000hz.html)

chuck55 20th June 2006 10:37 PM

4-5" driver 50-10,000hz
 
I have been unable to find a suitable full range driver so now considering a 2 way with the mid running full range.
Fostex F200 had to be played at minimum of 75 dB before it came to life. People here say FX120 bass does not keep up with rest of music plus its discontinued and no refoam kit is available. Other Fostex are bright with little bass. I'm afraid of brightness of Jordans. I don't want a 5dB boost to the bass and treble as the WR-125 does.

Can anyone suggest a 4-5" driver that will roll off at 10kHz without x-over? I would like to then add a tweeter with cap to high pass frequencies over 10kHz. Beaming is not an issue.
I have been unable to find a suitable full range driver so now considering a 2 way with the mid running full range. Considered the M130 except for the bad reviews of that driver here.

SPL is 75dB and I would use .25cu ft cabinet from Parts Express.
Thanks for any ideas.

RobWells 20th June 2006 11:04 PM

I'm not really into full range drivers, but if I was to have a go at a '2 way full range' I'd be looking at a nice hi -eff 10 or 12" driver to do bass up to say, 200 - 300 hz. Then use the full ranger all the way up.

Reason being I'd reckon a 4" or 5" driver would be much better at doing the treble than the bass....

What do you mean by spl is 75dB btw ? background music ?


Rob.

ScottG 20th June 2006 11:21 PM

Re: 4-5" driver 50-10,000hz
 
Quote:

Originally posted by chuck55
I'm afraid of brightness of Jordans.

Beaming is not an issue.

If you are afraid of "brightness" of the Jordans then beaming IS an issue.

The problem here is:

To have that small a driver, with that extended a freq. response, that also "came to life" - is virtually impossible.

The foremost problem here is that the "came to life" feeling is largely the domain of efficient drivers. ANY driver that small that is efficent enough to "come alive" will almost certainly have these qualities:
1. Low freq. extension to at most 70 Hz.
2. "tipped-up" higher freq. response.. i.e. "beaming".

The BEST driver I could think of that met your paramaters beyond "came to life" would be a driver that you'll have a hard time purchasing anymore (..Audax HM130C0).

If your willing to trade low freq. response (and get just about everything else you asked for) then there is the Veravox 5X at Solen.ca

A poorer "cousin" to the 5X would be the Fostex fe126e, but it has beaming as well unless modified (and a narrow band cavity resonance below 2 kHz).

If you give up the "came to life" parameter and the use of a Jordan then consider consider this thread by Thorsten:

http://www.diyaudio.com/forums/showt...threadid=80846

chuck55 21st June 2006 04:44 AM

Rob, I actually listen at 75 dB, not usually louder. So I think I can get into the 50's okay. I've given this some thought and decided it would be better to run a single driver for as much of the F-R as possible so that's why the x-over around 10kHz.

Thanks for the links Scott. They look like good drivers. FWIW my Tang-Band 871s plays down to 50dB okay, all things considered. OTOH the Fostex couldn't.
I don't see beaming as the same thing as a rising FR. A driver simply beams when the wavelength of the frequency approaches the diameter of the driver. Jordan makes a rising reponse curve to compensate for the beaming effect but to my ears, ANY rising FR is bright. I built the TB 1320 SA bamboo driver and had to get rid of it because it sounded bright.

My other thought is to go with the FR125 and eq it flat in the trebel and bass.

DoctorJ 21st June 2006 05:10 AM

DAYTON PA130-8 5" FULL RANGE P.A. DRIVER
Its response is 90-15k but your config will work

RobWells 21st June 2006 06:01 AM

Maybe position the speakers so you're listening off axis ? Should lose some 'bite'

Rob.

ScottG 22nd June 2006 06:57 PM

Quote:

Originally posted by chuck55

I don't see beaming as the same thing as a rising FR. A driver simply beams when the wavelength of the frequency approaches the diameter of the driver. Jordan makes a rising reponse curve to compensate for the beaming effect but to my ears, ANY rising FR is bright.

I can "see" that position. In the case of Ted's drivers though he doesn't do it so much to increase an averaged horizontal response - rather he does it to alter the driver's imaging properties (as opposed to a "flat"-on-axis vs. "flat"-off-axis response). As Rob has pointed out its a matter of loudspeaker positioning (i.e. "toe-in" or "toe-out").

Considering that you are going to use a tweeter - why not use a 1st order electrical crossover? I've personally never found a good air-core inductor to be detrimental to sound quality at reasnable power levels.

scudinc 23rd June 2006 05:13 AM

I don't think that such a driver exists. The closest thing I know of (at least for the high end requirement) is the Seas MCA15RCY, which is essentially flat to 10kHz. It's a midrange and not really designed for bass, but that may not matter much at the low levels at which you plan to listen.

I rewrote that last sentence four times and I'm still not happy with it; it stills sounds like a Wings lyric ("But in this ever-changing world in which we live inc"). I should sleep.

Reilumeininki 23rd June 2006 04:44 PM

Seas MCA15RCY is measured in IEC-baffle and that reason the low frequencies actually drops if put them in the box.

navin 23rd June 2006 05:13 PM

What about the Jordan JX6R. I think you might be better off getting a driver 100-20kHz like the Jordan above of 300-20khz like the Fostex FF85K. Mating either of these to a 5-8" woofer (depending on how big a speaker you desire) should work and integration at lower freq is easier as polar interference is not so much of an issue.

I am still waiting for some brave soul to use C37 on the dust cap of the JX92 (it is too expensive a driver for me to experiment with) and post results. I get the feeling that the rising response can be controlled by some such treatment.

Anyone brave enough or resourceful enough to ask Ted Jordan? :-)


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