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Forum: DIY Speakers and Subs   03-16-2017, 08:34 PM
Replies: 7
Views: 107
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: 29
Views: 694
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: 36,400
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: 483
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: 483
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: 483
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: 483
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: 145
Posted By michael hurd
Hogwash. :rolleyes:

Hogwash. :rolleyes:
Forum: DIY Speakers and Subs   02-16-2017, 04:43 PM
Replies: 82
Views: 2,264
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: 1,142
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: 989
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: 1,142
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: 353
Views: 20,686
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: 743
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: 743
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: 743
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.
Forum: DIY Speakers and Subs   01-02-2017, 05:44 PM
Replies: 50
Views: 743
Posted By michael hurd
If you are going for the 'cool' factor because no...

If you are going for the 'cool' factor because no one has used an enclosure out of steel before, great. The reasons they haven't are many, weight is a concern, and the fact that steel will have a...
Forum: DIY Speakers and Subs   01-02-2017, 05:28 PM
Replies: 13
Views: 392
Posted By michael hurd
Yes, it will sound much better with a properly...

Yes, it will sound much better with a properly designed box, and with a properly designed crossover that divides the frequency spectrum to each respective driver. These are non-negotiable if you want...
Forum: DIY Speakers and Subs   12-04-2016, 04:21 PM
Replies: 41
Views: 1,079
Posted By michael hurd
Low pressure / large surface area air bag. ...

Low pressure / large surface area air bag.

https://www.youtube.com/watch?v=yyxSHvREyrY
Forum: DIY Speakers and Subs   12-04-2016, 08:47 AM
Replies: 41
Views: 1,079
Posted By michael hurd
Kudos to diy speaker guy for doing the heavy...

Kudos to diy speaker guy for doing the heavy lifting when it comes to simulating large coil drivers.

Yes, an end to end resonance will be present, and it will sound terrible without addressing...
Forum: DIY Speakers and Subs   04-14-2016, 07:22 AM
Replies: 4
Views: 136
Posted By michael hurd
If you want a real upgrade, Mark Seaton ( Seaton...

If you want a real upgrade, Mark Seaton ( Seaton Sound ) used to sell an amplifier and driver package for the MFW 15.

If I am not mistaken the drive unit used was provided by Acoustic Elegance to...
Forum: DIY Speakers and Subs   04-11-2016, 09:08 PM
Replies: 9
Views: 353
Posted By michael hurd
There was also a few custom drivers made with 12...

There was also a few custom drivers made with 12 and at least one with a 10" cone and beefy 4" coil LMS motor. IIRC the story, it was made for underwater applications in a pool.
Forum: Ultra Hi-End HT Gear ($20,000+)   04-11-2016, 11:43 AM
Replies: 77
Views: 9,932
Posted By michael hurd
Yes you can easily spend a lot of money...

Yes you can easily spend a lot of money foolishly, but you need nothing more exotic than a few clamps, a decent circular saw with a long straight edge, a plunge router with a straight bit, perhaps a...
Forum: Ultra Hi-End HT Gear ($20,000+)   04-11-2016, 09:37 AM
Replies: 77
Views: 9,932
Posted By michael hurd
True, you can't buy time, and it takes time,...

True, you can't buy time, and it takes time, money and effort to delve deeply into the world of audio.

If you can put together a simple flat pack, solder components together, there are competent...
Forum: Ultra Hi-End HT Gear ($20,000+)   04-10-2016, 10:27 PM
Replies: 77
Views: 9,932
Posted By michael hurd
Community vetted design or 'design' by community...

Community vetted design or 'design' by community does not work. There are many people with personal views that do not understand all the science and compromise that is required to design a...
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