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Forum: DIY Speakers and Subs   10-01-2014, 08:52 AM
Replies: 1
Views: 35
Posted By JackNC
Danley has :) and if you look at how he did you...

Danley has :) and if you look at how he did you will see both that it would be difficult for DIY and that the coax wasn't in poor man's territory. Danley has the output of the CD of the coax...
Forum: DIY Speakers and Subs   10-01-2014, 08:16 AM
Replies: 26
Views: 288
Posted By JackNC
Well I think Mike is right on with the tuning. ...

Well I think Mike is right on with the tuning. The difference supports what was said earlier that if crossing over at 80 Hz sealed is find but one does get a few db more output (3db at 80 hz) for...
Forum: DIY Speakers and Subs   09-30-2014, 06:57 PM
Replies: 6
Views: 266
Posted By JackNC
You might turn that crossover board over and look...

You might turn that crossover board over and look for a bad or broken solder joint....
Forum: DIY Speakers and Subs   09-30-2014, 11:20 AM
Replies: 26
Views: 288
Posted By JackNC
Assuming your mains are integrated in a baffle...

Assuming your mains are integrated in a baffle wall or the front and near side walls have lots of absorption, then what you describe "60hz...and then falling off a cliff" won't be plagued with...
Forum: DIY Speakers and Subs   09-30-2014, 10:41 AM
Replies: 26
Views: 288
Posted By JackNC
Sealed or vented depends on where you want to...

Sealed or vented depends on where you want to cross to your subs. If crossing at a conventional 80 Hz, I don't see a reason not to go sealed. If crossing at 50-60 Hz for use with horn subs that...
Forum: DIY Speakers and Subs   09-19-2014, 05:50 PM
Replies: 44
Views: 869
Posted By JackNC
YIKES! its new construction with sheetrock that...

YIKES! its new construction with sheetrock that was hung in a day using nailer guns. I've already had a few (just a few fortunately) nail pops. Imagine the WAF when after promising an invisible...
Forum: DIY Speakers and Subs   09-19-2014, 09:44 AM
Replies: 83
Views: 2,592
Posted By JackNC
I emailed "Lukasz Lewandowski <info@autotech.pl>"...

I emailed "Lukasz Lewandowski <info@autotech.pl>" and got back a DXF file for the SEOS18. It was basically a box outline with the radius for the corners and sufficient to define a cutout. Had to...
Forum: DIY Speakers and Subs   09-19-2014, 07:09 AM
Replies: 44
Views: 869
Posted By JackNC
re' "if the attic isn't sealed, which it probably...

re' "if the attic isn't sealed, which it probably isn't, then it will function as a very lossy ported cab and that will be difficult to model"

Hi LTD:

Suppose one wants to do an attic IB where...
Forum: DIY Speakers and Subs   09-12-2014, 11:28 AM
Replies: 42
Views: 743
Posted By JackNC
Hi Fred: Its a fascinating journey you've...

Hi Fred:
Its a fascinating journey you've embarked on and while I'm only a few steps ahead of you, let me try to help. I'm just sitting in an airport so its something to do. You need to do this to...
Forum: DIY Speakers and Subs   09-11-2014, 09:20 AM
Replies: 340
Views: 58,923
Posted By JackNC
Just to be clear - to me, the sims just mean that...

Just to be clear - to me, the sims just mean that those positions are worth trying. This thread is all about the quarter width/height position and demonstrate how good it can be but the sims show...
Forum: DIY Speakers and Subs   09-10-2014, 08:35 PM
Replies: 340
Views: 58,923
Posted By JackNC
Hi Marty: Its real easy to do a room sim. I...

Hi Marty:

Its real easy to do a room sim. I had one set up and just changed dimensions to match your room. Tried both corner and quarter width/height placement. The corner placement looks...
Forum: DIY Speakers and Subs   09-02-2014, 06:15 AM
Replies: 11,258
Views: 741,738
Posted By JackNC
DPDT switch is reversing CD polarity

DPDT switch is reversing CD polarity
Forum: DIY Speakers and Subs   08-28-2014, 05:02 AM
Replies: 340
Views: 58,923
Posted By JackNC
So what are you all doing or planning to do for...

So what are you all doing or planning to do for absorption?

What the OP did seems to have worked but who has 60 cm of room length to spend on absorption?

I've run REW room sim on an SBA and see...
Forum: DIY Speakers and Subs   08-18-2014, 03:25 PM
Replies: 211
Views: 11,229
Posted By JackNC
That is certainly one of the reasons. With an...

That is certainly one of the reasons. With an offset horn I can use two drivers, for improved sensitivity and lower distortion and I get a lower horn height which helps with CTC.
Forum: DIY Speakers and Subs   08-18-2014, 11:12 AM
Replies: 211
Views: 11,229
Posted By JackNC
re'Interesting design. How does SoundEasy predict...

re'Interesting design. How does SoundEasy predict polars? Can you specify drivers as coaxials or horns? How does it account for the SEOS horn, for example

Sound easy doesn't model horns well but...
Forum: DIY Speakers and Subs   08-18-2014, 05:47 AM
Replies: 211
Views: 11,229
Posted By JackNC
Hi Rahula: I had seen your thread over at DIYA...

Hi Rahula:
I had seen your thread over at DIYA but didn't put 2 and 2 together here. Why not a SEOS 18 in the middle instead of a KEF?

I'm going in the same direction as you with WMTMW but...
Forum: DIY Speakers and Subs   08-17-2014, 07:28 PM
Replies: 211
Views: 11,229
Posted By JackNC
D'appolito says that directional mics aren't as...

D'appolito says that directional mics aren't as smooth in FR as omni's and have a proximity effect that raises the bass response. He favors omnidirectional condenser mics for their accuracy. After...
Forum: DIY Speakers and Subs   08-17-2014, 09:59 AM
Replies: 211
Views: 11,229
Posted By JackNC
directional mics for indoor measurements?

just reread the thread as I have SEOS18s on order
On this post, it struck me: what if we measured indoors with a directional mic?

I did a little research:

Line Microphones
When miking must...
Forum: DIY Speakers and Subs   08-15-2014, 08:40 AM
Replies: 11,258
Views: 741,738
Posted By JackNC
I'm looking at a 24" wide 90x45 horn mated with...

I'm looking at a 24" wide 90x45 horn mated with 18" SEOS, which per Bill's spreadsheet holds horizontal pattern control down to 383 hz. Its response is flat or nearly so down to 100 Hz but pattern...
Forum: DIY Speakers and Subs   08-15-2014, 07:08 AM
Replies: 11,258
Views: 741,738
Posted By JackNC
Not exactly what? I can see I wasn't clear...

Not exactly what?

I can see I wasn't clear enough about what kind of midhorn I had in mind. I referenced Synergy meaning a wooden conical horn with perhaps 2 8" or 10" drivers tapped into the...
Forum: DIY Speakers and Subs   08-15-2014, 04:58 AM
Replies: 11,258
Views: 741,738
Posted By JackNC
Bill: The 2nd horn is for the midrange. (maybe...

Bill:
The 2nd horn is for the midrange. (maybe it isn't; I didn't look at a picture of the JBL. If not, suppose it was) Consider a SEOS below a conical mid horn with a vented rear chamber. You...
Forum: DIY Speakers and Subs   08-08-2014, 08:56 AM
Replies: 15
Views: 543
Posted By JackNC
you can model the effect of the holy panel here: ...

you can model the effect of the holy panel here:

http://www.acousticmodelling.com/multi.php
Forum: DIY Speakers and Subs   08-05-2014, 09:28 AM
Replies: 836
Views: 51,762
Posted By JackNC
One way to enlarge a hole cleanly with a router...

One way to enlarge a hole cleanly with a router is the following
1. cut a circle with the router to fit tightly in the old hole using a router circle jig
2. glue it in place lightly
3. route...
Forum: DIY Speakers and Subs   08-04-2014, 10:48 AM
Replies: 836
Views: 51,762
Posted By JackNC
Hi Rory: I'm looking forward to seeing an FR...

Hi Rory:
I'm looking forward to seeing an FR measurement; wondering how smooth it is between 100 and 200 hz. Any info yet?
Thanks,
Jack
Forum: DIY Speakers and Subs   07-30-2014, 09:04 AM
Replies: 410
Views: 8,173
Posted By JackNC
Looking at SPL vs distance: 135 db @ 1m from...

Looking at SPL vs distance:

135 db @ 1m from 1 horn
141 db @ 1m from 2 horns
147 db @ 1m from 4 horns ????

-6db per doubling of distance from 2 horns:
135 db at 2m
129 db at 4m
...
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