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Advice on midrange driver
Advice on midrange driver
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Old 17th February 2019, 12:19 AM   #1
gago1101 is offline gago1101  United States
diyAudio Member
Join Date: Feb 2013
Default Advice on midrange driver

Hello everyone!
I would appreciate some advice regarding my recent decision to modify my speakers.

To start, I had heavily modified Klipsch RF7ii, where I converted ot to an active system. Changed the compression driver to Radian 475pb and added a Fostex T900a supertweeter. Low-mid was crossed at 1khz and mid-high at 7.5 khz. My active crossever is Marchand XM44 3-way crossover. Driving the woofers is my venerable Wyred4sound St1000; mids are driven my Mcintosh MC 275 mk VI 50th; and the supertweeters driven by pair of Opera consanance 800se monoblocks.

I was extremely happy with my system for the last 6 years. This system was really dynamic, at the same time buttery in mids and highs. Now I dropped and broke one if the Fostex. This was a reason for me to try to change things around.

I am thinking of getting rid of the horn and swap it with a conventional midrange driver to cover 300hz to about 3khz. I have already got the tweeters, wich are vintage Pioneer/TAD PT-R7A.

Now trying to decide on a midrange driver that would be good. Based on my research these few days, I am honing on either:
1. Scanspeak 12MU/4731T00
2. Accuton C90-6-724
3. Satori MR13PNW-4.

The mid will be crossed at 250 or 300hz at the low end and 3 or 4khz at the high end, both with 24db slopes.

I would like to get some advice on which of those 3 will be better, and any other drivers that you guys may recommend.

Thank you in advance!

Last edited by gago1101; 17th February 2019 at 01:25 AM.
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Old 17th February 2019, 03:59 AM   #2
Tromperie is offline Tromperie  Australia
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Join Date: May 2015
Location: Melbourne
You left out the SEAS MCA15 or 12.
Source: Daphile on old PC from the tip * Storage NAS: FreeNAS 11 * Pre-amp: DIY PGA2310 * Amps: 8 x LM3886TF
Xover: 24dB @ 300 and 3,000Hz * Speakers: DIY design CNC cut 54 laminations * Drivers SB 10", SB 5", VIFA 1" VTG
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Old 17th February 2019, 10:30 AM   #3
marco_gea is offline marco_gea  Italy
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Join Date: Apr 2005
Location: London, UK
The PT-R7A won't work that low. It needs to be crossed over at 7kHz as a bare minimum, and it is really "happier" >10kHz.
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Old 17th February 2019, 06:01 PM   #4
gago1101 is offline gago1101  United States
diyAudio Member
Join Date: Feb 2013
Originally Posted by marco_gea View Post
The PT-R7A won't work that low. It needs to be crossed over at 7kHz as a bare minimum, and it is really "happier" >10kHz.
Interesting, thanks for pointing this potential problem out. The spec states recommended crossover at 6khz high pass with 12db slope, so I thought 3khz at 24 db should do it. The frequency response also loooks to be flat down to 2khz.

Before doing anything else, I guess I will test and measure the tweeter’s performance in my current system with the horns.

Here is the frequency response of the pt-r7a I found, but I will do some measurements of my own
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