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Search: Keyword(s): ; Posts Made By: JackNC
Forum: DIY Speakers and Subs   02-05-2016, 09:57 AM
Replies: 93
Views: 1,363
Posted By JackNC
the quideline about sides not being equal is not...

the quideline about sides not being equal is not about panel resonance; its also about internal standing waves. If you stuff the box, you'll absorb internal reflections and won't have to worry...
Forum: DIY Speakers and Subs   02-05-2016, 09:46 AM
Replies: 93
Views: 1,363
Posted By JackNC
the quideline about sides not being equal is not...

the quideline about sides not being equal is not just about panel resonance; its also about internal standing waves. If you stuff the box, you'll absorb internal reflections and won't have to worry...
Forum: DIY Speakers and Subs   02-05-2016, 08:18 AM
Replies: 304
Views: 17,646
Posted By JackNC
Hi Gizzie: Just noticed your awesome huge...

Hi Gizzie:

Just noticed your awesome huge biradial horns and thought they would make a great starting point for a pair of synergies.

take a look at this thread ...
Forum: DIY Speakers and Subs   01-18-2016, 12:33 PM
Replies: 131
Views: 11,275
Posted By JackNC
The goal of the frustrum is to thin out the horn...

The goal of the frustrum is to thin out the horn wall where the hole goes through while minimizing the amount of air trapped between the speaker cone and the horn wall. You've done a nice job of...
Forum: DIY Speakers and Subs   01-18-2016, 10:43 AM
Replies: 14
Views: 338
Posted By JackNC
Can you use the volume under the stairs &/or the...

Can you use the volume under the stairs &/or the plant shelf?
A line of 12's in the outside corner of the room might work well also
Forum: DIY Speakers and Subs   01-18-2016, 10:42 AM
Replies: 14
Views: 338
Posted By JackNC
Can you use the volume under the stairs &/or the...

Can you use the volume under the stairs &/or the plant shelf?
A line of 12's in the outside corner of the room might work well also
Forum: DIY Speakers and Subs   01-12-2016, 08:18 AM
Replies: 32
Views: 524
Posted By JackNC
http://www.speakerworks.com/Custom_Steel_Speaker_G...

http://www.speakerworks.com/Custom_Steel_Speaker_Grill_Black_p/cg2b.htm

...custom steel speaker grills
Forum: DIY Speakers and Subs   12-14-2015, 11:31 AM
Replies: 7
Views: 158
Posted By JackNC
I doubt you will be able to get braces in through...

I doubt you will be able to get braces in through the driver hole. If not, then:

I wood drill holes in the outside of the box to just fit the largest diamenter dowels I could find. Then glue up...
Forum: DIY Speakers and Subs   12-10-2015, 04:37 PM
Replies: 20
Views: 352
Posted By JackNC
THe following link is to a white paper on the...

THe following link is to a white paper on the Murphy Corner Line Array and discusses the effective lengthening of a floor to ceiling line array by floor and ceiling reflections. Keep in mind that...
Forum: DIY Speakers and Subs   12-10-2015, 11:15 AM
Replies: 20
Views: 352
Posted By JackNC
re' I wonder how close drivers would need to be...

re'
I wonder how close drivers would need to be for a true line-source / cylindrical wave-form to form?

the minimum spacing is 1/4 wavelength at the highest frequency the line will be used. 4...
Forum: DIY Speakers and Subs   12-10-2015, 06:27 AM
Replies: 20
Views: 352
Posted By JackNC
If a line array extends from floor to ceiling,...

If a line array extends from floor to ceiling, then floor and ceiling reflections make it works as if it were infinitely long and so you can get the line array effect in room at bass frequencies and...
Forum: DIY Speakers and Subs   12-10-2015, 06:00 AM
Replies: 151
Views: 2,848
Posted By JackNC
That hump looks like boundary support.... ...

That hump looks like boundary support....


NF? if that is a nearfield response its not boundary support
Forum: DIY Speakers and Subs   12-09-2015, 07:52 AM
Replies: 23
Views: 426
Posted By JackNC
the problem with nearfield subs when you have 2...

the problem with nearfield subs when you have 2 rows of seating is that the subs are going to be nearfield only for the closest row.

You say the drivers will be 2 feet from your head. At 4 feet...
Forum: DIY Speakers and Subs   12-03-2015, 02:40 PM
Replies: 15
Views: 478
Posted By JackNC
If you want to see what wall mounting does to...

If you want to see what wall mounting does to your response, go to Charlie Laub's website and download Jeff Bagby's diffraction and boundary simulator
...
Forum: DIY Speakers and Subs   11-11-2015, 09:16 PM
Replies: 74
Views: 1,617
Posted By JackNC
I'm getting these numbers from Unibox, which is...

I'm getting these numbers from Unibox, which is doing the math for me

VBOX = 21 cu.ft = 594.7 L

Ftune = 13 hz

Vent dia = 8"

Vent one flush end: Port Length = 76.84 cm Port air speed...
Forum: DIY Speakers and Subs   11-11-2015, 12:11 PM
Replies: 66
Views: 2,124
Posted By JackNC
go to the link below and enter your room...

go to the link below and enter your room dimensions and speaker location into the calculator.
It may tell you where this null is coming from.

http://tripp.com.au/sbir.htm
Forum: DIY Speakers and Subs   10-22-2015, 01:20 PM
Replies: 24
Views: 422
Posted By JackNC
The JBL 2242 is too rich for my blood. What do...

The JBL 2242 is too rich for my blood. What do you all think of this similarly named driver, which to me looks pretty good on paper:

http://www.paudiothailand.com/pdf/products/P180-22423.pdf
...
Forum: DIY Speakers and Subs   08-29-2015, 08:08 AM
Replies: 18
Views: 631
Posted By JackNC
I suspect you want a woofer that plays a little...

I suspect you want a woofer that plays a little higher than 100 Hz for the Maggies, which like most planar drivers have limited Xmax. I would choose a driver that could play well up to 200 hz and...
Forum: DIY Speakers and Subs   08-29-2015, 07:17 AM
Replies: 29
Views: 1,113
Posted By JackNC
Just a thought, eh? Could you perhaps share what...

Just a thought, eh? Could you perhaps share what movitated that thought? i.e. why is your bass less than perfect?

I find it hard to imagine that even 8 wouldn't be adequate but if that were the...
Forum: DIY Speakers and Subs   08-21-2015, 06:58 AM
Replies: 133
Views: 4,859
Posted By JackNC
If you have your subs in the front corners and...

If you have your subs in the front corners and the LP centered on the width then they are equidistant from the LP and won't cancel each other. They may need to be time aligned with your mains to...
Forum: DIY Speakers and Subs   08-19-2015, 08:12 AM
Replies: 281
Views: 5,199
Posted By JackNC
Another thing that didn't occur to me: measuring...

Another thing that didn't occur to me: measuring speakers with the AVR in the loop. Of course that is what you want to do if measuring in room and using the AVR for equalization (e.g. Audessey). My...
Forum: DIY Speakers and Subs   08-19-2015, 05:33 AM
Replies: 281
Views: 5,199
Posted By JackNC
The question is how do you get the audio into and...

The question is how do you get the audio into and out of the PC. It will have some kind of a sound card in it and at least headphone and mic jacks. You can also do audio I/O using HDMI although...
Forum: DIY Speakers and Subs   08-18-2015, 05:59 AM
Replies: 281
Views: 5,199
Posted By JackNC
I don't see why the ECM8000 wouldn't work. It...

I don't see why the ECM8000 wouldn't work. It would be best if you had a calibration file for it. Behr claims its got a "ruler flat response", which it probably does until somewhere down in the...
Forum: DIY Speakers and Subs   08-17-2015, 08:52 AM
Replies: 125
Views: 5,189
Posted By JackNC
Thanks, Nate. Found it on the web and bookmarked...

Thanks, Nate. Found it on the web and bookmarked it!
Forum: DIY Speakers and Subs   08-17-2015, 08:23 AM
Replies: 68
Views: 1,511
Posted By JackNC
An interesting experiment would be to rotate the...

An interesting experiment would be to rotate the speaker 90 degrees and raise it up off the floor, or leave it on the floor. Either way you can determine if its an end effect or a floor proximity...
Showing results 1 to 25 of 391

 
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