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Very, Very cheap compression-drivers and waveguides?
Very, Very cheap compression-drivers and waveguides?
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Old 31st October 2019, 06:19 PM   #1
TroelsM is offline TroelsM  Denmark
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Default Very, Very cheap compression-drivers and waveguides?

I can get some very, very cheap compression-drivers that on paper looks impressive for the price.

Around 10-15Eu for a 1,5" diaphragm 30-100W rating. Build quality and size looks much better than a similar prized "hifi-tweeter".

I'm looking to match the driver with a "pro" 6" (91dB, 200/400w, above 150Hz), so I don't need 100dB/W sensitivity that a compression´-driver can do with a proper horn. Crossover around 2-2,5Khz, 4th order active filter. Not looking for audio-nirvana, but good-sounding, loud party-music ( assisted by a 12" sub).

Question 1: can a compression-driver be used with a short waveguide instead of a "real" horn or would it be hopeless?.

Question 2: how critical is the mating of horn and compression-driver? - I'm thinking about buying a few cheap one for testing, but if you say its hopeless, I'll go another route.

Kind regards TroelsM
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Old 31st October 2019, 06:31 PM   #2
kipman725 is offline kipman725  United Kingdom
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This might be useful:
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Horn/waveguide are just different names that people use depending on whether their primary objective is loading a compression driver with a desired acoustic impedance over a wide bandwidth (horn) or directivity control (waveguide). Usually cheap waveguides are just copies of other companies designs perhaps made with lower quality plastic. In terms of matching compression drivers to horns/waveguides at a basic level (beyond matching exit diameters etc) there are longer compression drivers that effectively have a portion of horn on the front of the driver (TAD ETC) and generally more modern designs that are less deep and attach to the horn at the tip of the phase plug (IE B&C DE250). A long driver won't work well with a rapidly expanding modern waveguide.
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Old 31st October 2019, 08:00 PM   #3
seedlings is offline seedlings  United States
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You will get sound out of the compression driver without any horn mounted, yes, though many horn waveguides are very inexpensive, if you look around. Find out if your 1.5” is threaded or bolt-on.

A link to the actual driver would be helpful.
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Old 31st October 2019, 08:06 PM   #4
b_force is offline b_force  Europe
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Sica as well as LaVoce already have very affordable compression drivers and both are reputable brands.
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Old 31st October 2019, 08:20 PM   #5
TroelsM is offline TroelsM  Denmark
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This one is threaded. 1,3/8" i think. 44mm Diaphragm. No usefull datasheet. 150 danish is 20Eu, but the same range of drivers goes down to 11Eu with similar build-style.

Does all threaded drivers count as "long" and require a long horn.

Kind regards TroelsM
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Old 1st November 2019, 11:35 AM   #6
chris661 is offline chris661  United Kingdom
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You could do something as easy as taking some 36mm thick plywood, drill a hole to allow the HF driver to mount, and use a large roundover bit in a router to make a very short horn/waveguide.

Done correctly, it'll probably provide a small boost above 10kHz, which is often where compression drivers need help.


There are lots of problems with cheap compression drivers on cheap horns, though - I measured one that had the 2-3kHz range 10dB over the rest of the range in a large bump. I'm sure you can imagine the difficulty that would present in the crossover.

Chris
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Old 1st November 2019, 11:46 AM   #7
TroelsM is offline TroelsM  Denmark
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Hi Chris

Yes, I thought about making a short horn/waveguide. I could get access to a lathe ( or build on... - I need another project like...). I'm doing active filters and I have room to do a little EQ as well.

If you search AliExpress for "Finlemho" a couple of very cheap horns pop up. I'm tempted to buy e few for testing.

(as always: a project starts out as a cheapo, and evolves into something thats, well, not so cheap...)

Kin regards TroelsM;
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Old 1st November 2019, 08:56 PM   #8
TroelsM is offline TroelsM  Denmark
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By chance I found a few of the MRH-80 on sale so now I "just" need the driver.
MONACOR: MRH-80

The connection from the threaded part to the horn looks very rugged, -almost like a error in the tooling for the plastic parts, - but I guess it can be fixed with epoxy or silicone.
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Old 1st November 2019, 09:38 PM   #9
TroelsM is offline TroelsM  Denmark
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question: Would i prefer a larger or smaller diaphragm for the MRH-80 horn if the goal is to play from 2.2Khz in a 200W system with a 6" midbass?

I guess that power-handeling goes up with a larger voicecoil, and maybe also output, but whats the drawbacks? : breakup? limited HF response?

Kind regards TroelsM
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Old 1st November 2019, 11:09 PM   #10
kipman725 is offline kipman725  United Kingdom
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Quote:
Originally Posted by TroelsM View Post
: breakup? limited HF response?

Kind regards TroelsM
these and cost.
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