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Forum: DIY Speakers and Subs   05-10-2017, 04:28 PM
Replies: 225
Views: 8,266
Posted By michael hurd
Not specifically. I intend to quantify the...

Not specifically.

I intend to quantify the amount of sound transmission through one, using a bookshelf speaker inside another enclosure with the woofer(s) shorted.
Forum: DIY Speakers and Subs   05-10-2017, 03:41 PM
Replies: 225
Views: 8,266
Posted By michael hurd
Klippel poster on loudspeaker cone...

Klippel poster on loudspeaker cone non-linearities:

https://www.klippel.de/fileadmin/klippel/Files/Know_How/Literature/Papers/KLIPPEL_Cone_Vibration_Poster.pdf
Forum: DIY Speakers and Subs   05-10-2017, 03:28 PM
Replies: 225
Views: 8,266
Posted By michael hurd
Exactly, and some people study this phenomenon. ...

Exactly, and some people study this phenomenon.

Beyma has a link on their site to an AES paper on modes in loudspeaker cones here:

https://www.beyma.com/uploads/descargas/1352741048.pdf
Forum: Receivers, Amps, and Processors   04-30-2017, 08:18 AM
Replies: 81
Views: 1,587
Posted By michael hurd
Define 'better'. 5 way binding posts are more...

Define 'better'. 5 way binding posts are more 'flexible' in terms of cable terminations, not necessarily better.

75w RMS into 8R is a bit over 24 V.

I prefer Neutrik Speakon connectors, but...
Forum: Receivers, Amps, and Processors   04-30-2017, 05:51 AM
Replies: 81
Views: 1,587
Posted By michael hurd
You will have to find an installer that sells...

You will have to find an installer that sells these, they don't sell them at Amazon or regular A/V stores. You didn't mention if you require XLR outputs: This does not have RCA outputs.
...
Forum: DIY Speakers and Subs   04-30-2017, 05:25 AM
Replies: 76
Views: 2,134
Posted By michael hurd
My experience with PL Premium - best practice is...

My experience with PL Premium - best practice is to scrape it off while it is still semi-solid. After about 3-4 hours of curing, it shaves off very easily and cleanly with a sharp knife. Support the...
Forum: DIY Speakers and Subs   04-30-2017, 03:44 AM
Replies: 149
Views: 4,490
Posted By michael hurd
This is what I was alluding to in post # 25, in...

This is what I was alluding to in post # 25, in not as many words. Wood moves with changes in moisture.
Forum: Subwoofers, Bass, and Transducers   04-20-2017, 09:01 PM
Replies: 3,692
Views: 102,448
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: 178
Views: 4,525
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: 178
Views: 4,525
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: 771
Views: 34,662
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: 771
Views: 34,662
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: 178
Views: 4,525
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: 178
Views: 4,525
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: 178
Views: 4,525
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: 178
Views: 4,525
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: 114
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: 149
Views: 4,490
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: 36,625
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: 489
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: 489
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: 489
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: 489
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: 179
Posted By michael hurd
Hogwash. :rolleyes:

Hogwash. :rolleyes:
Forum: DIY Speakers and Subs   02-16-2017, 04:43 PM
Replies: 138
Views: 4,894
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...
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