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Forum: Subwoofers, Bass, and Transducers   04-20-2017, 09:01 PM
Replies: 3,040
Views: 84,342
Posted By michael hurd
No speaker wire to the subs or speakers either. ...

No speaker wire to the subs or speakers either.

Kinda like 'display' televisions at Ikea.... big plastic boxes with nothing in them. This is a how to 'not' assemble an audio system folks.
Forum: DIY Speakers and Subs   04-20-2017, 08:34 PM
Replies: 144
Views: 3,527
Posted By michael hurd
Absolutely the cones will pass more sound then...

Absolutely the cones will pass more sound then the box walls, without a doubt. I suppose that one could substitute wooden circular plugs for the woofers instead. Not too hard to make with a router...
Forum: DIY Speakers and Subs   04-19-2017, 11:15 PM
Replies: 144
Views: 3,527
Posted By michael hurd
I can try this in a few weeks when the weather is...

I can try this in a few weeks when the weather is good, and can band pass a bookshelf speaker actively to measure the amount of re-radiated sound out of an enclosure with the main woofers shorted so...
Forum: DIY Speakers and Subs   04-15-2017, 05:31 PM
Replies: 417
Views: 19,260
Posted By michael hurd
Second cup of coffee = needed...:rolleyes: ...

Second cup of coffee = needed...:rolleyes:

Since the force factor is based on the B field and the length of wire in the gap, larger diameter, longer coil wind is more wire length, although...
Forum: DIY Speakers and Subs   04-15-2017, 05:17 PM
Replies: 417
Views: 19,260
Posted By michael hurd
Higher radiation resistance, better power...

Higher radiation resistance, better power transfer from the diaphragm to air as the driver diameter goes up, at low frequencies.
Forum: DIY Speakers and Subs   04-14-2017, 04:13 PM
Replies: 144
Views: 3,527
Posted By michael hurd
What I am suggesting is that yes, there is some...

What I am suggesting is that yes, there is some radiation from the enclosure. Yes, I am stating that the sound I heard was traveling through the cabinet ( between 500 and 2khz ). IIRC, the chamber...
Forum: DIY Speakers and Subs   04-14-2017, 02:09 PM
Replies: 144
Views: 3,527
Posted By michael hurd
I have had the opportunity to hear a sweep of a...

I have had the opportunity to hear a sweep of a tower loudspeaker in an anechoic chamber. Standing behind the loudspeaker at a distance of about 2 meters, you can barely perceive any sound with a...
Forum: DIY Speakers and Subs   04-13-2017, 09:41 PM
Replies: 144
Views: 3,527
Posted By michael hurd
This is correct, and any acoustic panel also...

This is correct, and any acoustic panel also perform better when spaced away from the solid surface behind it.
Forum: DIY Speakers and Subs   04-13-2017, 09:37 PM
Replies: 144
Views: 3,527
Posted By michael hurd
I

If you have put your ear to a rail road track, you can 'hear' a train coming from a long way off, yet the vibration is basically nil. Same with underwater sounds, the sounds of propellers can be...
Forum: DIY Speakers and Subs   03-16-2017, 08:34 PM
Replies: 7
Views: 112
Posted By michael hurd
Without knowing what you are trying to...

Without knowing what you are trying to accomplish, you probably will not get a lot of responses.

An analog would be similar to attempting brain surgery in the dark with a chainsaw. :serious:
...
Forum: DIY Speakers and Subs   03-16-2017, 07:12 PM
Replies: 70
Views: 2,369
Posted By michael hurd
Did you measure the moisture of the boards prior...

Did you measure the moisture of the boards prior to glue up? I'd hate for you to go through all of this work to have problems when the wood moves as it acclimates to your environment.
Forum: DIY Speakers and Subs   02-22-2017, 05:10 PM
Replies: 613
Views: 36,536
Posted By michael hurd
Rob, don't forget as the coils warm up the DCR...

Rob, don't forget as the coils warm up the DCR increases.

If I am not mistaken Ricci did a few measurements of 'hot' impedance after sweeps, you might gain some insight there, not sure if it was...
Forum: DIY Speakers and Subs   02-21-2017, 04:11 PM
Replies: 26
Views: 486
Posted By michael hurd
As mentioned Frequency modulation and Amplitude...

As mentioned Frequency modulation and Amplitude modulation distortion are not suspension related.

Typical harmonic distortion is relatively benign compared to FMD, more so the lower orders [ 2nd...
Forum: DIY Speakers and Subs   02-21-2017, 04:04 PM
Replies: 26
Views: 486
Posted By michael hurd
Try this: Play a mixed, equal amplitude 40...

Try this:

Play a mixed, equal amplitude 40 hz signal and a 400 hz signal in your 'small box loudspeaker' and see what the 400 hz signal does when modulated by the woofer undergoing 40 hz...
Forum: DIY Speakers and Subs   02-20-2017, 10:52 PM
Replies: 26
Views: 486
Posted By michael hurd
Absorption will treat standing waves. I built...

Absorption will treat standing waves. I built some 6 foot long sonotube subs years ago, and they had a terrible overhang from an end to end resonance. It wasn't just the spike in FR amplitude, they...
Forum: DIY Speakers and Subs   02-20-2017, 10:46 PM
Replies: 26
Views: 486
Posted By michael hurd
It may be common practice, but it is not wise. ...

It may be common practice, but it is not wise.

E. W. Kellogg in 1931 proposed 0.1 cm ( 1mm ) as a maximum amplitude of diaphragm excursion to keep FMD and AMD distortion to a reasonable level....
Forum: DIY Speakers and Subs   02-20-2017, 10:13 PM
Replies: 5
Views: 178
Posted By michael hurd
Hogwash. :rolleyes:

Hogwash. :rolleyes:
Forum: DIY Speakers and Subs   02-16-2017, 04:43 PM
Replies: 126
Views: 4,225
Posted By michael hurd
Shh.... a certain someone might drop in to...

Shh.... a certain someone might drop in to proclaim you have 100% distortion below tune, and that you have 'undone' your world class system. :)

Or in the alternative, that the measurements aren't...
Forum: DIY Speakers and Subs   02-07-2017, 06:38 PM
Replies: 53
Views: 1,165
Posted By michael hurd
Woodworking 101... wood moves with moisture...

Woodworking 101... wood moves with moisture content. Using solid wood with plywood or other sheet goods is not a great idea, unless they are absolutely the same moisture content prior to attachment,...
Forum: DIY Speakers and Subs   02-04-2017, 08:34 PM
Replies: 31
Views: 1,000
Posted By michael hurd
Not many people open up the wiring connector in...

Not many people open up the wiring connector in the plug n' play world. Straight from engineering: we used 4 conductor wire, and 4 conductor plugs, the wires are in parallel inside the enclosure and...
Forum: DIY Speakers and Subs   02-04-2017, 03:41 PM
Replies: 53
Views: 1,165
Posted By michael hurd
If this is a first time tool purchase, consider...

If this is a first time tool purchase, consider use, storage and set up of any system before purchase.

A circular saw, mated to a premium guide system, can be easily stored, moved and set up....
Forum: DIY Speakers and Subs   02-04-2017, 03:27 PM
Replies: 388
Views: 23,784
Posted By michael hurd
Morning wood? :rolleyes: Recessed waveguide...

Morning wood? :rolleyes:

Recessed waveguide for the win. How are you going to adhere it to the baffle? My suggestion would be a 1K moisture cure urethane product like Sika-Flex.
Forum: DIY Speakers and Subs   01-02-2017, 06:59 PM
Replies: 50
Views: 748
Posted By michael hurd
I would strongly urge that if you want the metal...

I would strongly urge that if you want the metal cylinder 'look' or plate look to wrap a sonotube enclosure. It will be a lot lighter, you won't need a crane to move it into position.

Alternately,...
Forum: DIY Speakers and Subs   01-02-2017, 05:51 PM
Replies: 50
Views: 748
Posted By michael hurd
Instead of going for flat plate, you may be...

Instead of going for flat plate, you may be better served by making the enclosures cylindrical, this will require a lot less bracing compared to a rectangular enclosure. They will still need heavy...
Forum: DIY Speakers and Subs   01-02-2017, 05:47 PM
Replies: 50
Views: 748
Posted By michael hurd
Just re-read the posts, didn't realize you are in...

Just re-read the posts, didn't realize you are in a bunker underground... disregard the information about the weight then.
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