The ideal Ribbon/AMT match for a 6.5" driver? - diyAudio
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Old 8th September 2014, 05:39 PM   #1
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Default The ideal Ribbon/AMT match for a 6.5" driver?

Vague question I know, dependent on the driver, design etc

An issue, based on a few reviews I've read, is that many 6-7 inch midbass/ ribbon builds have either beaming or a slight loss of definition, caused by the higher crossover.
So ideally you'd want your ribbon/amt tweet to be crossed over no higher than say, 2.5khz; lower if possible

But then the problem here is that most low x/o ribbons are longer and so have that vertical issue.. Also there are price restraints too.

The 4 or 5 that may work ok are

Fountek x2.0 (claimed minimum 2.3khz x/o) 2nd order
Fountek x3.0 (claimed minimum 2.0khz x/o) 2nd order
Aurum Cantus AST2560 (claimed 1.9khz x/o) * high order?
Beyma TPL 150/B (included this as the price is lower now)
BG Neo 3 ?


I'm not claiming to be knowledgeable on this, hence the question!
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Old 8th September 2014, 06:20 PM   #2
chrisb is online now chrisb  Canada
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a buddy of mine has had some success using the Dayton AMTPRO 4 - in a 3-way with W8-1772 and re-purposed 8" Martin Logan service return woofers, as well as JBL2225

Dayton's specs suggest XOs as low as 800Hz - personally the couple of times I've used AMT (original Heils), I preferred them XO at the other end of the 'phone band - i.e./ between 3000 and 3200 IIRC - it was over 10 yrs ago.
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Last edited by chrisb; 8th September 2014 at 06:24 PM.
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Old 8th September 2014, 06:42 PM   #3
zmyrna is offline zmyrna  United Kingdom
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it is never a good idea to push ribbons/amt/planars
use a big one; you can try the Raal foam trick to help vertical
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Old 8th September 2014, 06:48 PM   #4
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CSS Planar 2

Click the image to open in full size.

It can cross very low (1khz easily). I would not use it in an MTM of course.

Last edited by RockLeeEV; 8th September 2014 at 06:50 PM.
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Old 8th September 2014, 07:02 PM   #5
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My thoughts (spending money I don't have) were on the Supravox 165GMF (much better waterfall response chart than their 8" drivers) with Mundorf AMT29CM1.1-R. The Supravox are 96dB and easily go into the 2K2 (6dB) crossover region specified by the Mudorf (which is 100dB in sensitivity).

A pair of 165s in an MTM config should produce a 99dB woofer sensitivity, correct? That would allow for a very nice "flea-powered amp" system, although that changes the crossover requirements IIRC, and the tweeter might need to be positioned directly right/left of the woofer pairs. Raw noob here, seeing if anyone will correct me/educate me on this...

Supravox:
165 GMF SUPRAVOX

Mundorf:
The Madisound Speaker Store

Best luck on your system direction, looking forward to your process and results. I'm currently enjoying a set of Peerless Nomex 6.5" with BG Neo3 planars (both are 90dB sensitive) and as I swap pro components into the crossover, they just become better and better.

Last edited by Tape Echo; 8th September 2014 at 07:04 PM.
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Old 9th September 2014, 03:57 PM   #6
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Quote:
Originally Posted by Tape Echo View Post
V nice response, will look to see what kind of price these can be found in europe.
Also read a v good review of a speaker using what looks like the Fountek X 3.0 (in an english HiFi mag)
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Old 9th September 2014, 04:01 PM   #7
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Quote:
Originally Posted by RockLeeEV View Post
CSS Planar 2

Click the image to open in full size.

It can cross very low (1khz easily). I would not use it in an MTM of course.
That thing is huge but impressive
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Old 9th September 2014, 06:20 PM   #8
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I've been wondering if the neo3 could be horn-loaded to assist with lower crossovers, perhaps in a rectangular-ish horn like this one:

RCF H100 1" Horn 90x75

No idea whether or not there's an appropriate cross-section of the horn that would fit the neo 3, or what the response would look like...
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Old 10th September 2014, 11:20 AM   #9
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I guess thats the way to make some of the less big amt/ribbons cross just the bit lower. Shame that horns are just so ugly imo

Maybe a front horn design similar to the raidho perhaps, if they work on a larger scale
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Old 10th September 2014, 02:10 PM   #10
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Default Solution...but expensive!

Hi bill,

As a fan of line arrays here is an idea, if money is not a factor...

Use 4 PHL 1230 (16 Ohm version) Welcome on PHL audio web site wired in parallel for a 4 Ohm load.
Give each driver approx. 12 litres of sealed air volume (before damping and driver) and use Eq to fine tune low end response...Great power handling and really natural detailed sound all the way down to around 40Hz.

Cabinet dimension of approx. 300mm wide by 750mm tall allow tight "edge to edge" vertical spacing of PHL drivers with a single, side mounted, Beyma AMT TPL at the mid point of the array.
If you want greater vertical coverage use 4 AMT drivers in a vertical array mounted tight against the array of PHL drivers.
Crossover anywhere from 1.5 KHz all the way up to 3.5Khz depending on your crossover topology and vertical / horizontal directivity requirements.
I have heard the single TPL version used as near-field monitors....WOW!

If you require massive SPL's and or want impressive floor-standers simply build good subs and mount the arrays on top.
Take care to use Sorbothane or similar to decouple the arrays from the subs.

Hope this helps.
Cheers
Derek.
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