Best horn/waveguide for a 1.4" exit CD? - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 14 Old 11-15-2010, 04:33 PM - Thread Starter
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I am thinking about trying some Beyma CP-755nd/AL compression drivers in the speakers I built earlier and would like some help in selecting the best 1.4" flare for it.

Anyone got any thoughts?

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post #2 of 14 Old 11-15-2010, 11:53 PM
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1.4" horns have trouble hitting 20kHz

I've always been interested in this:
http://www.eighteensound.com/index.a...roduct&pid=177

It was used successfully in the Raptor:
http://www.htguide.com/forum/showthr...ghlight=xt1464

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post #3 of 14 Old 11-16-2010, 01:04 AM
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not sure if that is fully right.

nsd1480n looks pretty good on that horn, but i'm not really sure if i like that horn. seems a little narrow, but that is your call.


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post #4 of 14 Old 11-16-2010, 01:50 AM - Thread Starter
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Also looking at the ND1460A now.

But I can get the 755's quite cheap.

The diaphragm is alluminum which I usually read about that it sounds better than titanium.

I really want to see what effect crossing lower will have. As I am running a TD-15m for the low/mid. To cross lower I need more beef in the CD and a larger flare.

Also when I play at very loud levels I get harshness (>105dbA at LP). A bigger CD might be more relaxed at these levels and hopefully reduce harshness. Might try the fiberglass experiment one day on the QSC waveguides.

The measurements taken of the XT1464 seem very good from this member at HT guide. Nothing like the posted ones on the 18 sound site.

http://www.htguide.com/forum/showthr...ghlight=xt1464

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post #5 of 14 Old 11-16-2010, 01:23 PM
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Here's a plot of the BMS 4594 Co-axial CD on 18 sound horn, with CD eq applied and minimal EQ.

One caveat of that horn is it's narrow pattern though.


LL

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post #6 of 14 Old 11-16-2010, 10:07 PM - Thread Starter
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Looks like I will be getting the XT1464's.

I can just about perform a drop in replacement from the QSC's with a bit of work.

Which compression drivers to get?

1460A or the Beyma 755AL?

Going to retire the 380m's into my yamaha PA cabs.

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post #7 of 14 Old 11-17-2010, 04:02 PM
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DL86, you are using a single TD15M in each box correct? You might have a bit of a time to dial in the crossover with the wide polars of the woofer and then transitioning to the narrow polars of the horn.

18 sound also has the XT1496 available, 1.4" throat, 90 x 60 degree coverage that may be a bit more suitable.

http://www.eighteensound.com/index.a...roduct&pid=276

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post #8 of 14 Old 11-17-2010, 06:30 PM - Thread Starter
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Yeah a single TD-15M.

I've seen that the directivity matches to a 15" at about 1.5khz with the XT1464. So really the purpose of having a bigger CD is defeated with this combo?

Wouldn't you loose directivity control with the smaller XR1496? It is about 10x10 inches where as the XT1464 is 15x12 inches.

I bought the XT1464's anyway I found them here locally for an excellent price. If they don't work out no big loss.

Any responses are appreciated.

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post #9 of 14 Old 11-18-2010, 01:56 PM
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Looking at the spec sheets on the 18Sound site, it appears that they both are 'usable' from 500 hz on up. Their 'recommended' crossover point for either horn is 800 hz or more.

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post #10 of 14 Old 11-18-2010, 02:38 PM
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Get some 18's

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post #11 of 14 Old 11-20-2010, 12:16 AM - Thread Starter
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Quote:
Originally Posted by michael hurd View Post

Looking at the spec sheets on the 18Sound site, it appears that they both are 'usable' from 500 hz on up. Their 'recommended' crossover point for either horn is 800 hz or more.

I will see how I go with the XT1464. If it fails I will try something else like the XR1496. But I prefer the more focused beam pattern and larger mouth area which would result in less reflections in the room and greater control down low. Someone correct me if I am wrong.

Still thinking about which compression driver to go.

Does anyone have any thoughts or experience about the Eighteen Sound titanium nitride domes? Seems to be very well behaved in the higher octaves than other materials.

http://www.eighteensound.com/staticC..._Sound_TPM.pdf

Could get the the NSD1480N.

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post #12 of 14 Old 11-20-2010, 12:26 AM
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Do they have BMS down under?

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post #13 of 14 Old 11-20-2010, 12:55 AM - Thread Starter
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No. BMS is probably the most expensive option at the moment.

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post #14 of 14 Old 11-20-2010, 08:29 AM
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Quote:
Originally Posted by DL86 View Post

I will see how I go with the XT1464. If it fails I will try something else like the XR1469. But I prefer the more focused beam pattern and larger mouth area which would result in less reflections in the room and greater control down low. Someone correct me if I am wrong.

Still thinking about which compression driver to go.

Does anyone have any thoughts or experience about the Eighteen Sound titanium nitride domes? Seems to be very well behaved in the higher octaves than other materials.

Agree with your thoughts on the XT vs XR...in fact I'm working on replacing my 80 degree OS WGs with new 32"x26" prolate spheroid WGs, including a gradual increase in directivity with increasing frequency. One of the objectives is to improve on the "splashy" HF sound of constant directivity...achieve a pleasant in-room balance with close to flat response on-axis. Better detail retrieval without sounding bright.

The Beyma CP-755nd/AL also made my short list, but honestly don't remember why I ultimately went with 18Sound. Would be great to hear them in an A-B comparison.

The aluminum 18Sound has better LF distortion performance than the titanium nitride version (probably due to the mylar vs titanium surrounds). Titanium nitride is better on the top end, but my ears can no longer hear harmonics of anything above 7k...harmonics of lower frequencies are more objectionable to me.

To achieve lower HF distortion, I inquired about using the 1460 aluminum dome in the more powerful 1480 motor but 18Sound said it won't fit.


Titanium nitride 2nd and 3rd HD (at over 110db):




Aluminum 2nd and 3rd (same level):



(The 2060/2080 versions are simply the 1460/1480 with 2" adaptors.)
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