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Forum: DIY Speakers and Subs   02-28-2015, 09:52 AM
Replies: 332
Views: 10,910
Posted By Rick Craig
The OEM RAAL (70-20XR) won't cross that low. I've...

The OEM RAAL (70-20XR) won't cross that low. I've designed some higher sensitivity 3-ways with the 140-15D and Audax / AE 6.5" mids. The foam pads smooth out the vertical dispersion and the smaller...
Forum: DIY Speakers and Subs   02-27-2015, 12:01 PM
Replies: 332
Views: 10,910
Posted By Rick Craig
The horn is needed to extend the low frequency...

The horn is needed to extend the low frequency response but it's pretty obvious that the crossover point should be higher than 1K. I would expect the horizontal power response to be much better...
Forum: DIY Speakers and Subs   02-26-2015, 10:17 PM
Replies: 332
Views: 10,910
Posted By Rick Craig
When you window the response the gate frequency...

When you window the response the gate frequency is used help reduce the room effects on the response. So if you have a graph starting at 200hz like above then the gate should be set no higher than...
Forum: DIY Speakers and Subs   02-26-2015, 07:23 PM
Replies: 332
Views: 10,910
Posted By Rick Craig
The gate frequency looks to be 251hz but the...

The gate frequency looks to be 251hz but the graph extends to 200hz?
Forum: DIY Speakers and Subs   02-22-2015, 11:56 AM
Replies: 332
Views: 10,910
Posted By Rick Craig
I can't really answer for the people that like...

I can't really answer for the people that like them but in my own experience (I've heard 4-5 different designs) they always fall short in tonality and horizontal dispersion. The low frequency...
Forum: DIY Speakers and Subs   02-22-2015, 11:38 AM
Replies: 48
Views: 1,005
Posted By Rick Craig
I've designed several DIY kits with the RAAL...

I've designed several DIY kits with the RAAL tweeters.
Forum: DIY Speakers and Subs   02-21-2015, 05:53 PM
Replies: 332
Views: 10,910
Posted By Rick Craig
We have a large CBT array with 2" full-range...

We have a large CBT array with 2" full-range drivers in the gym at my church. It actually works pretty well but it's not something I would do for a home system.
Forum: DIY Speakers and Subs   02-21-2015, 03:45 PM
Replies: 332
Views: 10,910
Posted By Rick Craig
This is with a ribbon shorter than the BG Neo8 so...

This is with a ribbon shorter than the BG Neo8 so there will be more variance with the BG tweeter starting at a lower frequency. If the BG is used in a non-shaded array it will also further degrade...
Forum: DIY Speakers and Subs   02-21-2015, 03:28 PM
Replies: 332
Views: 10,910
Posted By Rick Craig
You don't need an anechoic chamber to take useful...

You don't need an anechoic chamber to take useful distortion measurements. Attached is a graph of the same array in the previous post here taken at 1M referenced to 90db. You can even put the...
Forum: DIY Speakers and Subs   02-21-2015, 02:44 PM
Replies: 332
Views: 10,910
Posted By Rick Craig
Here are some curves I did with a straight array...

Here are some curves I did with a straight array of ten 6.5" woofers and ten ribbons. A DSP crossover was used along with equalization. The cabinet was 70" tall and these were taken at 70" away...
Forum: DIY Speakers and Subs   02-21-2015, 01:36 PM
Replies: 332
Views: 10,910
Posted By Rick Craig
There is quite a bit of nonsense in 2-channel...

There is quite a bit of nonsense in 2-channel audio but in HT I think it's much more sane. I have a cabinetmaker and a finisher that both do a great job. Thanks for your kind comments.
Forum: DIY Speakers and Subs   02-21-2015, 12:05 PM
Replies: 332
Views: 10,910
Posted By Rick Craig
Silly was just a bad choice of words. I think the...

Silly was just a bad choice of words. I think the later posts help explain why he made that comment.
Forum: DIY Speakers and Subs   02-21-2015, 12:02 PM
Replies: 332
Views: 10,910
Posted By Rick Craig
I've not heard the M2 but it looks like JBL...

I've not heard the M2 but it looks like JBL really did their homework on that design. How do you like the highs compared to the BMS drivers?
Forum: DIY Speakers and Subs   02-21-2015, 11:40 AM
Replies: 332
Views: 10,910
Posted By Rick Craig
It probably would be best to test it a 2M and...

It probably would be best to test it a 2M and then calculate for 1M sensitivity; however, the -3db nearfield will change with distance. That's what makes it difficult to compare to a point source...
Forum: DIY Speakers and Subs   02-21-2015, 11:20 AM
Replies: 332
Views: 10,910
Posted By Rick Craig
A straight array of that length won't sum very...

A straight array of that length won't sum very well at 1M so it should be measured further back. With a CBT array it wouldn't be an issue though.
Forum: DIY Speakers and Subs   02-20-2015, 08:04 PM
Replies: 332
Views: 10,910
Posted By Rick Craig
I think what Josh meant is the amount of off-axis...

I think what Josh meant is the amount of off-axis frequency extension. I agree that the BMS is a very good driver but there are many domes and ribbons that have better high frequency extension....
Forum: DIY Speakers and Subs   02-16-2015, 07:20 PM
Replies: 48
Views: 1,005
Posted By Rick Craig
Rick, can you tell me more about this kit. I'm...

Rick, can you tell me more about this kit. I'm intrigued by this combination. The sb satori driver is one of the best available, but which ribbons is it pair with.[/QUOTE]

It's the same ribbon I...
Forum: DIY Speakers and Subs   02-16-2015, 06:48 PM
Replies: 48
Views: 1,005
Posted By Rick Craig
I've not heard either speaker but I'll give you...

I've not heard either speaker but I'll give you an honest perspective from the view of a designer. If possible, some people prefer to keep the coverage pattern the same across the L/C/R speakers....
Forum: DIY Speakers and Subs   02-16-2015, 12:11 PM
Replies: 48
Views: 1,005
Posted By Rick Craig
Sorry to derail your thread with the RAAL...

Sorry to derail your thread with the RAAL discussion. To answer your question, yes you can build a DIY set that will outperform the Ascend speakers (which I do think are a good value). I recently...
Forum: DIY Speakers and Subs   02-15-2015, 04:15 PM
Replies: 48
Views: 1,005
Posted By Rick Craig
Do I wish they were less expensive? Absolutely!...

Do I wish they were less expensive? Absolutely! But consider this isn't a large manufacturer in China cranking out thousands of drivers a week. The magnetics are also very expensive and to have...
Forum: DIY Speakers and Subs   02-15-2015, 12:50 PM
Replies: 48
Views: 1,005
Posted By Rick Craig
I've used three different RAAL models and I...

I've used three different RAAL models and I assure you it's not all about hype. Now whether it's an economical upgrade for something like the Ascend that could be debated - there is always the law of...
Forum: Speakers   01-28-2015, 09:09 PM
Replies: 22
Views: 680
Posted By Rick Craig
One thing you need to consider is what trade-offs...

One thing you need to consider is what trade-offs you want to make. I have designed higher efficiency speakers though Selah is often portrayed as only building lower sensitivity speakers. As a rule...
Forum: Speakers   11-19-2014, 09:18 PM
Replies: 19
Views: 1,104
Posted By Rick Craig
I based my comment on what drivers like that...

I based my comment on what drivers like that typically achieve in terms of sensitivity.
Forum: Speakers   11-11-2014, 10:41 PM
Replies: 19
Views: 1,104
Posted By Rick Craig
Nice looking design! A few comments though (based...

Nice looking design! A few comments though (based on designing and measuring many arrays with domes, planars, and ribbons). The planar tweeter doesn't eliminate comb filtering. A simple set of...
Forum: Speakers   11-11-2014, 10:17 PM
Replies: 19
Views: 1,104
Posted By Rick Craig
The location of the tweeter line affects the...

The location of the tweeter line affects the crossover because the delay time of the two lines is different to the listening position. With an active system like this you can change the delay if...
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