Acoustic Horn Design – The Easy Way (Ath4)

[TNT]

Something that could play 110 dB at 1m with less than 0,1% THD (2nd..9th) between 500-10000 with an existing driver. You see, I would like one (1) source to cover the basic content of live acoustical music incl. speech (so 400-... really). There are very good and researched resons why telecom systems are specified to transfer 400-4k.

CE550?

https://levelav.nl/wp-content/uploa...sibilities-and-Limitations-Wenmaekers-Hak.pdf

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[gatedriver]

I would indeed prefer the CE360 size, IOW similar diameter as a 15" woofer..
Are you planning a 1" or 1.4" throat?
What material?

 

[Jokerbre]

A short survey -
If I were to run a crowdfunding project to make an injection moulded free standing waveguides (basically to collect resources for making a steel mould, which is on the order of thousands of USD, and then let produce a batch), what waveguide size, if any, would you prefer? CE360, perhaps, or something bigger?

CE360 sounds like good idea

 

[pelanj]

As large as possible for me. 360 or larger would do it for me.

 

[mabat]

The CE360 should be actually pretty universal, usable with either 12" or 15" woofer. That's the main reason I would suggest it. This is a 12" woofer placed in a sphere (overlaid over the CE360 chart) - it matches the WG just below 1 kHz (it will be slightly different in a box).

I would consider a 1" driver at the moment.

 

[mlee]

I would prefer something like the ATH-CE460-0. Around 18" or maybe just a bit smaller. It would be nice to solidly support a 15" driver and XOVER lower than the 900hz range with a 1" throat.

 

[mabat]

CE360 is quite a good match for 15" woofer. The radiation patterns will "blend" around the crossover frequency, which could be around 800 Hz in this case, so it should end up pretty well -

 

[mabat]

I already have a quotation for the mould - it's $4400 USD for the CE360. I guess it would be a lot more for something CE460.

 

[mlee]

I already have a quotation for the mould - it's $4400 USD for the CE360. I guess it would be a lot more for something CE460.

Nice! I don't to stir the pot but did you have a driver in mind?

 

[mabat]

Not yet.

This is a 15" woofer + CE460 (which may already be an overkill for a 1" driver).

 

[Jokerbre]

CE360 is quite a good match for 15" woofer. The radiation patterns will "blend" around the crossover frequency, which could be around 800 Hz in this case, so it should end up pretty well -

Fantastic

 

[danibosn]

what about throat angle?
there should be agreement what CD to use

 

[Brinkman]

I purchased (and received) a pair of HF-1440 CDs just to follow along with you, Mabat. I would be interested in two pairs of whatever ATH model is best for those. I would be more than happy to help fund towards that.

 

[Jokerbre]

what about throat angle?
there should be agreement what CD to use

I agree, but it shouldn't be expensive. A good option would be something from Tympahny or Celestion.

 

[TNT]

I already have a quotation for the mould - it's $4400 USD for the CE360. I guess it would be a lot more for something CE460.

Perhaps check with them - there could be a steep "entry/setup" fee and the size might not matter so much?

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[Zvu]

+1 for CE360

Compression driver should be something readily available in EU/US/Asia, something that will not shut down or be discontinuited in a few years, with reasonable performance and price.

So BMS, B&C, RCF, 18sound, Beyma ???

I guess that most 1" drivers aren't ridiculously priced if we disregard esoteric units.

 

[Jokerbre]

Typmphany would be my choice and it is
Polyamide surround and titanium diaphragm coated with light thin layer of unique damping material (Like JBL)

 

[Zvu]

I'm afraid that Tymphany should be left out of the equation. They are notorious for discontinuing speaker units and 4400$ is a lot of money to take that risk.

Celestion on the other hand looks very good. Reliable company that doesn't change their offer every few years.

 

[mabat]

I think that the best bet is simply to make the throat angle large enough. The higher the exit angle then, the better. The worst thing that can happen is that it will require some slight additional EQ. After all, this is not meant to be easy, but at least available. People will never agree on something as a compression driver.

 

[mabat]

I purchased (and received) a pair of HF-1440 CDs just to follow along with you, Mabat. I would be interested in two pairs of whatever ATH model is best for those. I would be more than happy to help fund towards that.

Hopefully I get to measure it soon. I have it all prepared to try to measure the exit wavefront, which could be some fun, finally.