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Forum: DIY Speakers and Subs   03-03-2015, 04:51 PM
Replies: 47
  HzHorn
Views: 1,069
Posted By JackNC
Figure out the angles??? if you've drawn it in...

Figure out the angles??? if you've drawn it in sketchup, you can use the protractor tool to give you the angles
Forum: DIY Speakers and Subs   02-26-2015, 06:13 PM
Replies: 31
Views: 657
Posted By JackNC
Amazing how that works, isn't it? Can be...

Amazing how that works, isn't it? Can be frustrating if you can't move, though.

Turning the sub around and noticing a difference - that most likely is due to boundary cancellation. With the cone...
Forum: DIY Speakers and Subs   02-26-2015, 05:20 PM
Replies: 31
Views: 657
Posted By JackNC
It sounds like a room integration, room mode...

It sounds like a room integration, room mode issue. Based on the room dimensions you get standing waves which result in peaks and nulls at various frequencies in the 20 -200 Hz range. EQ can cut...
Forum: DIY Speakers and Subs   02-24-2015, 08:51 AM
Replies: 349
Views: 11,853
Posted By JackNC
OK. Maybe I am conflating specific tests with...

OK. Maybe I am conflating specific tests with discussions/arguments I've read.

OTOH, I think the question that needs to be answered is which CD is best for the horn on which it will be used or...
Forum: DIY Speakers and Subs   02-24-2015, 08:22 AM
Replies: 349
Views: 11,853
Posted By JackNC
I think Geddes claims of CD- equivalence are...

I think Geddes claims of CD- equivalence are based on tests where all CDs are listened to on the same horn after having been EQed to have the same FR. Thus the perceived differences have to be due...
Forum: DIY Speakers and Subs   02-10-2015, 06:39 AM
Replies: 353
Views: 11,351
Posted By JackNC
I'm a little late to the party but I have a...

I'm a little late to the party but I have a theory and some background info that may help.

re' what is the noise floor coming out of the miniDSP?
-114 db is impressively high. The challenge...
Forum: DIY Speakers and Subs   01-14-2015, 08:39 AM
Replies: 353
Views: 11,351
Posted By JackNC
The problem one has with mid bass modules is that...

The problem one has with mid bass modules is that many of the pro woofers used work much better ported. The ported response shows a peak rise in group delay at the box tune frequency and is...
Forum: DIY Speakers and Subs   01-07-2015, 03:41 PM
Replies: 30
Views: 767
Posted By JackNC
Nice house! Its definitely going to be an...

Nice house! Its definitely going to be an acoustic challenge, though. I suspect you already know that. The DIY approach is to keep adding subs until it smooths out. Four subs should do it. Two,...
Forum: DIY Speakers and Subs   01-07-2015, 12:40 PM
Replies: 30
Views: 767
Posted By JackNC
that sounds like the typical L shaped ground...

that sounds like the typical L shaped ground floor of a "transitional" architecture tract home. Do you also have high ceilings? I had that room with subs on the front wall and got a huge...
Forum: DIY Speakers and Subs   01-05-2015, 06:22 AM
Replies: 35
Views: 1,271
Posted By JackNC
There are some subtle differences between the...

There are some subtle differences between the BMS4550 and e.g. the DE250 with which it competes, making it hard to say which is better. The one most on topic of this thread is that its voice coil...
Forum: DIY Speakers and Subs   12-15-2014, 10:26 PM
Replies: 34
Views: 852
Posted By JackNC
You may have seen my comment about resonance in...

You may have seen my comment about resonance in that other thread where structural integrity came up. Google "tacoma narrows bridge collapse" to see what I'm talking about. BTW, that bridge was...
Forum: DIY Speakers and Subs   12-15-2014, 05:18 PM
Replies: 15
Views: 363
Posted By JackNC
I just sold a house with brick facade and with...

I just sold a house with brick facade and with cracks in the brick. The buyer questioned the cracks. A licensed professional engineer said (paraphrasing) such cracks are normal due to settling and...
Forum: DIY Speakers and Subs   12-14-2014, 06:17 AM
Replies: 517
Views: 12,634
Posted By JackNC
You can put screws in invisibly from the back...

You can put screws in invisibly from the back side of the double baffle and not need so many clamps.
I've used green glue for damping when doing a double baffle. What I can't tell you is if its...
Forum: DIY Speakers and Subs   12-10-2014, 05:53 PM
Replies: 24
Views: 603
Posted By JackNC
that is all theory/analysis. The best thing to...

that is all theory/analysis. The best thing to do is measure your response in room and tailor the solution to it. You may need some boost or cut around the box tuning frequency to make the response...
Forum: DIY Speakers and Subs   12-10-2014, 03:04 PM
Replies: 24
Views: 603
Posted By JackNC
check this thread out if you haven't already done...

check this thread out if you haven't already done so:

http://www.avsforum.com/forum/155-diy-speakers-subs/1461489-how-extend-high-pass-filter-below-20hz-dcx2496.html

also works for iNuke DSP
Forum: DIY Speakers and Subs   12-10-2014, 07:04 AM
Replies: 32
Views: 568
Posted By JackNC
The ported and passive radiator are virtually the...

The ported and passive radiator are virtually the same. The passive radiator functions equivalently to a port but doesn't chuff or have a pipe resonance. The disadvantage is they can cost almost as...
Forum: DIY Speakers and Subs   12-10-2014, 06:06 AM
Replies: 32
Views: 568
Posted By JackNC
The way to squeeze the most SPL out of it,...

The way to squeeze the most SPL out of it, generally speaking, would be to put it in a big box, but then you lose the advantage of using a 10" driver. If you are going to use a big box, you might as...
Forum: DIY Speakers and Subs   12-03-2014, 08:20 PM
Replies: 239
Views: 4,816
Posted By JackNC
Re' "To note, you do not twist the connector into...

Re' "To note, you do not twist the connector into place on the input, correct?"

Right! In fact, the input connectors don't twist. The output connectors are different.and do twist...

If no...
Forum: DIY Speakers and Subs   11-28-2014, 03:07 PM
Replies: 4
Views: 128
Posted By JackNC
The "Physical Vb" parameter in the left most...

The "Physical Vb" parameter in the left most column sets the box volume. Vb means "volume of the box and is in liters". You put a number in there and it shows you the response. If you like the...
Forum: DIY Speakers and Subs   11-22-2014, 02:57 PM
Replies: 15
Views: 526
Posted By JackNC
I was stuck in the same loop for a while. I'm...

I was stuck in the same loop for a while. I'm basically going to add subs until I'm satisfied. I did some room sims to see what it took to tame the room and it looked like full range mains plus...
Forum: DIY Speakers and Subs   11-10-2014, 12:45 PM
Replies: 150
Views: 6,097
Posted By JackNC
here are the specs

here are the specs
Forum: DIY Speakers and Subs   11-10-2014, 06:32 AM
Replies: 12,205
Views: 828,346
Posted By JackNC
Good point, that didn't occur to me, but I was...

Good point, that didn't occur to me, but I was careful not to make an absolute statement:)

Still, I don't think one loses anything with 35 Hz mains assisted by subs. There is some research, don't...
Forum: DIY Speakers and Subs   11-10-2014, 06:15 AM
Replies: 12,205
Views: 828,346
Posted By JackNC
Going for that extra octave on the low end is...

Going for that extra octave on the low end is likely to cost you too much on the high end of the woofer range. That is why so many MBMs cover from 40 Hz up. And 30-40 Hz MBMs are what one can do...
Forum: DIY Speakers and Subs   11-10-2014, 05:58 AM
Replies: 12,205
Views: 828,346
Posted By JackNC
30 Hz up is considered full range for music...

30 Hz up is considered full range for music because very few musical instruments (I'm only aware of pipe organs) have fundamentals lower than 30 Hz
Forum: DIY Speakers and Subs   11-09-2014, 04:42 PM
Replies: 12,205
Views: 828,346
Posted By JackNC
Modularity is a solution for the seller more so...

Modularity is a solution for the seller more so than for the buyer. But it can also help the buyer who wants to spread out his investment over time.

If these are designed correctly, no version...
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