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Old 02-23-2012, 03:44 PM - Thread Starter
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I just wanted to share my new build using a 6.5" kevlar reinforced coaxial driver with a 1" HF compression driver.

I am also using a third order crossover (18 dB/oct) crossed at 2.2 kHz.

The cabinets were built by John at diyspeakercabinets.com with a volume of .55 cu/ft. with a black paint finish.

The speaker has a sensativity of 95dB, a 150 Watt power handling and a 118 dB peak SPL output at 8 ohms.

I just plugged them in and I am letting them break in but initial impressions are that they are very quick with large headroom and large dynamics. They are a little foward and a little harsh in the top end but I am waiting to see if the mellow out a little after some hours of use. But overall, I am very happy with the result so far and far exceed the sound coming from my current M&K LCR55 MKII speakers.
I have also used a Kinetics Noise KUA-100 acoustical foam panel on the interior back wall of the cabinet. I wonder if anyone has used anything else that has improved the sound they get from their speakers?

Here are some pics:


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Old 02-23-2012, 03:47 PM
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All I see is a mid size woofer, is that a coincident driver?
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Old 02-23-2012, 03:59 PM
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Quote:
Originally Posted by DiscoDuck View Post

All I see is a mid size woofer, is that a coincident driver?

Thread title: My new coax build



Looks clean. Nice.

My Dual 18" LLT subs 120dB down to 10hz

 

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Old 02-23-2012, 04:14 PM
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Agreed. The cabinets look great. They look like you designed them to fit exactly in the spot pictured. Do you intend to try them on stands? What size is the distance between the speakers? Perhaps toeing them in and widening the distance between them could improve the sound. Certainly worth a try, but still it sure is an improvement to the sound system when you're pleased overall and that's what matters most. Good job.
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Old 02-23-2012, 05:06 PM
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What drivers are you using?
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Old 02-23-2012, 05:27 PM
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Quote:
Originally Posted by tsloms View Post

What drivers are you using?

Id like to know too as a good 6.5 with 95dB sensitivity in a coax would be worth investigating.
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Old 02-23-2012, 05:30 PM - Thread Starter
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I was trying to keep them secret but...

JBL Pro Control 227c drivers and crossover.
http://www.jblpro.com/catalog/genera...x?PId=35&MId=2

here is the driver assembly


and crossover
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Old 02-23-2012, 11:52 PM
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Ah, okay. So they are really more like 90dB sensitive than 95dB.

My Dual 18" LLT subs 120dB down to 10hz

 

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Old 02-24-2012, 12:03 AM
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Thanks for that ifor. At $US230 or so, too rich for my blood when 8CX21 is actually 95dB and about $160. I don't need the xover though, which distorts my view on the value perspective. I'd like to hear them though, and someone here, maybe AJinFLA used them in OBs if I recall correctly.
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Old 02-24-2012, 12:19 AM - Thread Starter
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I couldn't fit a 8" in my cabinet area, so I went with this one.

Plus it makes for a really nice, high output, smallish speaker that I can make to fit many different configurations. In cabinets for instance where space is limited. I like that it doesn't matter how it is positioned as well, you get the same sound whether it's upright or on it's side, like a center.

Being that it is also from thier Pro line, the driver is high quality and the crossover is very well built.
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Old 02-24-2012, 12:22 AM - Thread Starter
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Quote:
Originally Posted by Scott Simonian View Post

Ah, okay. So they are really more like 90dB sensitive than 95dB.

But for competitive comparison!!!! (i really don't know what that means)
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Old 02-24-2012, 12:26 AM
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Quote:
Originally Posted by ifor View Post

I couldn't fit a 8" in my cabinet area, so I went with this one.

Plus it makes for a really nice, high output, smallish speaker that I can make to fit many different configurations. In cabinets for instance where space is limited. I like that it doesn't matter how it is positioned as well, you get the same sound whether it's upright or on it's side, like a center.

Being that it is also from thier Pro line, the driver is high quality and the crossover is very well built.

It is probably a very nice driver, and I'm a big fan of JBL stuff. It obviously suits you needs, and I agree than a coax makes a nice centre (had a KEF coax centre in the bedroom of the last place).

I was sort of hoping it was 95dB, good, and $100. Back to dreaming.
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Old 02-24-2012, 12:35 AM - Thread Starter
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I couldn't find any other 6.5" coax with a compression driver for the life of me.
But I am a JBL fan as well as I was with a company that sold the highest amount of Synthesis and Performance systems in the country a few years ago.
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Old 02-24-2012, 09:28 AM
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Quote:
Originally Posted by Scott Simonian View Post


Thread title: My new coax build



Looks clean. Nice.

My point being, I see no coincident tweeter in the photo. Looks like a baby sub.
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Old 02-24-2012, 10:38 AM - Thread Starter
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Quote:
Originally Posted by DiscoDuck View Post

My point being, I see no coincident tweeter in the photo. Looks like a baby sub.

See the picture of the driver? See where my thumb is? Thats the high frequency compression driver and magnet structure.

It doesn't use a traditional tweeter in the sense that you see in a coaxial speaker like in cars speakers.

Seaton and JTR use similar drivers like this to great effect. This is why I wanted to use this driver in my speaker. It is very efficient, dynamic and has a wide dispersion pattern and their orientation doesn't matter. They can go much louder than using a regular tweeter as the tweeter is usually the driver that gives out at high volumes.
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Old 02-24-2012, 11:37 AM
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Quote:
Originally Posted by DiscoDuck View Post

My point being, I see no coincident tweeter in the photo.

Attached is a cutaway of a Tannoy coax as are an older DC386 driver with a fabric dome over the throat and a DMT15 which doesn't have it.
LL
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