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-   -   High efficiency 12 inch midrange - recommendations? (http://www.diyaudio.com/forums/multi-way/149334-high-efficiency-12-inch-midrange-recommendations.html)

hasselbaink 24th August 2009 10:57 AM

High efficiency 12 inch midrange - recommendations?
 
Hi,

I am about to buy a 12" midrange driver to play the 150 to 800 hz band and it will hand over upper midrange to a Coral M100 unit mounted on a 400 hz tractrix horn. I'm looking for 100 db plus at no more than -3 db at 150 hz in a reasonably sized baffle.

My favorite at the moment is the 18Sound 12NMB420, but are there any good 12 inchers with even more sensitivity?

Cheers
Kris

col 24th August 2009 12:30 PM

How about the good ole JBL E120? Can still pick them up on Ebay.

col.

jerome69 24th August 2009 02:07 PM

Hi,

Also
Beyma 12MI100 : http://profesional.beyma.com/pdf/12MI100E.pdf


Hava fun

StigErik 24th August 2009 02:18 PM

Or Beyma 12P80Nd....
101dB 2.83v @ 1m @ 2pi

http://profesional.beyma.com/ingles/pdf/12P80Nd.pdf

hasselbaink 24th August 2009 07:20 PM

The JBL might be interesting - sort of depends on what breakup there is close to x-over frequency and what it is capable of near the 150 cycles area.

The Beymas look mediocre and their sensitivity is closer to 95 db than what they claim.

The 18Sound driver is still top of my list...

StigErik 24th August 2009 07:33 PM

That 18sound driver looks pretty much like 95 dB @ 150 Hz as well.

It is interesting to calculate the efficiency using the T/S parameters, as this will say a lot about what you will get in real life around 150 Hz, where the speaker is more or less operating in free-field acoustic conditions.

The drivers mentioned have the following sensitivity based on T/S (into 4pi)

18Sound 12NBM420 93,0 dB
Beyma 12MI100 93,2 dB
Beyma 12P80Nd 93,5 dB

kenpeter 24th August 2009 07:38 PM

Eminence Wizard looks smooth over that range. Course if you cross much above 800
you gonna start hearing the MI cone doing its thing... Claim 103dB, but the graph is
101 over the range of interest to you.

Brett 24th August 2009 07:55 PM

AE TD12M, 18Sound 12NDA520
http://sites.google.com/site/driverv...band-75-1558se

ScottG 24th August 2009 08:58 PM

http://www.supravox.fr/anglais/haut_...rs/285_GMF.htm

http://oem.ciare.com/it/297/359/prodotti.php

hasselbaink 25th August 2009 10:21 AM

wide baffle
 
Quote:

Originally Posted by StigErik (Post 1906151)
That 18sound driver looks pretty much like 95 dB @ 150 Hz as well.

It is interesting to calculate the efficiency using the T/S parameters, as this will say a lot about what you will get in real life around 150 Hz, where the speaker is more or less operating in free-field acoustic conditions.

The drivers mentioned have the following sensitivity based on T/S (into 4pi)

18Sound 12NBM420 93,0 dB
Beyma 12MI100 93,2 dB
Beyma 12P80Nd 93,5 dB

The driver will be placed in a wide U shaped baffle with very large roundovers and very gradual transfer into 4pi. The 18Sound 12NBM420 is measured in a small enclosure. I expect baffle step to appear below x-over freq. in the set up that I use.

Kris


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