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Forum: DIY Speakers and Subs   02-22-2017, 11:33 AM
Replies: 146
Views: 4,629
Posted By Mark Seaton
I hadn't really thought about that, but it does...

I hadn't really thought about that, but it does push the tuning to around 13Hz, as going back to my models, the tuning is a little closer to 18Hz when I line up the impedance curve to models. With...
Forum: DIY Speakers and Subs   02-22-2017, 10:39 AM
Replies: 146
Views: 4,629
Posted By Mark Seaton
For those curious, here is the data sheet Bennett...

For those curious, here is the data sheet Bennett provided me of the 21SW115-8. Bennett indicated both of these will be added to the website in the near future and a few of the known dealers will be...
Forum: Area Home Theater Meets   02-21-2017, 04:38 PM
Replies: 1,217
Views: 28,532
Posted By Mark Seaton
There are some interesting possibilities if you...

There are some interesting possibilities if you could have someone take an impedance curve of one of your boxes as the D4 might have a bit less motor strength and I don't know the DCR. The way to...
Forum: Area Home Theater Meets   02-21-2017, 04:32 PM
Replies: 1,217
Views: 28,532
Posted By Mark Seaton
Oops. Too much multi-tasking on that one. The...

Oops. Too much multi-tasking on that one. The 63Hz value was the one I missed. The others were correct. This makes the 63Hz number around 128.6dB. Again, I would expect burst to be higher,...
Forum: Area Home Theater Meets   02-21-2017, 04:28 PM
Replies: 1,217
Views: 28,532
Posted By Mark Seaton
Hi Carp, Looking over this I wanted to check,...

Hi Carp, Looking over this I wanted to check, how do you have the HT18s wired to the amp vs channels?
Forum: Area Home Theater Meets   02-21-2017, 03:50 PM
Replies: 1,217
Views: 28,532
Posted By Mark Seaton
It was a lot of fun to catch up with you and many...

It was a lot of fun to catch up with you and many others this weekend. We need to keep finding more excuses for fun gatherings of enthusiasts to talk and reassure each other that there are other...
Forum: Area Home Theater Meets   02-21-2017, 02:22 PM
Replies: 1,217
Views: 28,532
Posted By Mark Seaton
One very important misunderstanding here as...

One very important misunderstanding here as pointed out by Archea is compression. Looking at 63Hz, you can see that on the multi-level sweeps the driver produced ~112.6dB @ 63Hz in the 40V low to...
Forum: DIY Speakers and Subs   02-21-2017, 12:42 PM
Replies: 146
Views: 4,629
Posted By Mark Seaton
I did take some impedance sweeps but caught that...

I did take some impedance sweeps but caught that I was getting errant readings until the 3rd unit. I'll retake some and post that. You are correct that the 21DS115-4 is rather potent. Take a look...
Forum: DIY Speakers and Subs   02-20-2017, 05:48 PM
Replies: 146
Views: 4,629
Posted By Mark Seaton
Yes, I know, DIYers tend to get way too caught up...

Yes, I know, DIYers tend to get way too caught up in what looks smoothest in a raw measurement. :rolleyes: Now consider you will need/want a high pass filter on that response which will taper the...
Forum: DIY Speakers and Subs   02-20-2017, 04:59 PM
Replies: 146
Views: 4,629
Posted By Mark Seaton
The question is mostly what B&C USA...

The question is mostly what B&C USA (bennettprescott) stocks stateside. What the distributors get up on their website often correlates, but not always. In this case you can look at US Speaker where...
Forum: DIY Speakers and Subs   02-20-2017, 12:52 PM
Replies: 146
Views: 4,629
Posted By Mark Seaton
Hi Guys, While it was still pretty chilly...

Hi Guys,

While it was still pretty chilly when I took these measurements and wind noise was creeping in below ~14Hz, it still gives very good idea of the differences between these 4 drivers when...
Forum: Area Home Theater Meets   02-17-2017, 02:08 PM
Replies: 1,217
Views: 28,532
Posted By Mark Seaton
I'm headed out this afternoon with Jeff, but we...

I'm headed out this afternoon with Jeff, but we won't be in town soon enough for the John Wick 2 showing. If anyone wants seats PM/e-mail me at sales@seatonsound.net and I can pass on the 2 tickets...
Forum: Dedicated Theater Design & Construction   02-17-2017, 12:26 PM
Replies: 461
Views: 19,296
Posted By Mark Seaton
Hey Chop! With the peaked ceiling, you might...

Hey Chop!

With the peaked ceiling, you might want to consider having a frame built left to right at some appropriate height with a fabric track. You can spend a bunch on huge width rolls for...
Forum: Subwoofers, Bass, and Transducers   02-16-2017, 03:57 PM
Replies: 58
Views: 1,246
Posted By Mark Seaton
Obviously I am heavily biased, but I would argue...

Obviously I am heavily biased, but I would argue that starting with a flat/smooth response is important to the end sound quality.

When you measure at your listening position you can only take so...
Forum: Area Home Theater Meets   02-14-2017, 09:28 AM
Replies: 1,217
Views: 28,532
Posted By Mark Seaton
I'm in for John Wick, Row 43, seat 19.

I'm in for John Wick, Row 43, seat 19.
Forum: DIY Speakers and Subs   02-13-2017, 01:47 PM
Replies: 146
Views: 4,629
Posted By Mark Seaton
Well stated. I more so mentioned it in the...

Well stated. I more so mentioned it in the context that the 21DS115 was impressively quiet, not saying the 21SW152 was bad. While I prefer drivers that have low operational/self noise for home use...
Forum: DIY Speakers and Subs   02-12-2017, 04:29 PM
Replies: 146
Views: 4,629
Posted By Mark Seaton
Short answer: The area inside a 6" VC is greater...

Short answer: The area inside a 6" VC is greater than inside a 4.5" VC, and a driver with a 6" VC is being built to withstand serious thermal abuse. Air movement, rather than low noise oscillation,...
Forum: DIY Speakers and Subs   02-12-2017, 10:46 AM
Replies: 146
Views: 4,629
Posted By Mark Seaton
For deep bass applications where maximum power...

For deep bass applications where maximum power handling isn't much of a consideration past the 4.5" VC in the 21DS115, I expect we'll mostly see subtle differences in parameters and response, along...
Forum: DIY Speakers and Subs   02-11-2017, 07:41 PM
Replies: 146
Views: 4,629
Posted By Mark Seaton
After some initial testing I decided to give each...

After some initial testing I decided to give each driver some time on the bench for break in. With an Fs in the 30-37Hz range, getting enough motion takes a bit more care to be sure you won't cause...
Forum: DIY Speakers and Subs   02-10-2017, 11:18 AM
Replies: 146
Views: 4,629
Posted By Mark Seaton
Finishing up some further measurements this...

Finishing up some further measurements this weekend. Not getting detailed into maximum output, but some useful info.
Forum: DIY Speakers and Subs   02-07-2017, 06:09 PM
Replies: 7
Views: 271
Posted By Mark Seaton
Quickly eyeballing things in the iNuke software,...

Quickly eyeballing things in the iNuke software, try flipping the HS12 to a LS12 with ~+8dB @ 20Hz. Set the high pass filter to Bessel, 12dB @ 20Hz.
Forum: DIY Speakers and Subs   02-07-2017, 12:15 PM
Replies: 7
Views: 271
Posted By Mark Seaton
You might want to try turning off the limiter...

You might want to try turning off the limiter first and checking if you have the levels calibrated. Right now you're barely allowing peaks of 225W:
...
Forum: Subwoofers, Bass, and Transducers   02-03-2017, 01:51 PM
Replies: 6,744
Views: 367,904
Posted By Mark Seaton
Please reach out to Brian or Carol at...

Please reach out to Brian or Carol at SpeakerPower (http://www.speakerpower.net/), as they supplied and can most certainly service the amplifier in your subwoofer. Let them know you purchased the...
Forum: DIY Speakers and Subs   02-02-2017, 12:45 PM
Replies: 49
Views: 1,091
Posted By Mark Seaton
A 26" wide opening is much easier than a 26" wide...

A 26" wide opening is much easier than a 26" wide box. You can either just build them on a flat face with the drivers set back slightly with only 4" of the edge of the woofer concealed, or you can...
Forum: DIY Speakers and Subs   02-01-2017, 06:58 PM
Replies: 49
Views: 1,091
Posted By Mark Seaton
You will end up rolling off the LT20s well above...

You will end up rolling off the LT20s well above the tuning frequency in the 40s, so the interaction there should be minimal. The sealed option also has no set frequency limits, just a matter of how...
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