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Forum: DIY Speakers and Subs   02-21-2017, 02:24 PM
Replies: 20
Views: 301
Posted By Bill Fitzmaurice
Sealed f3 in 4 cu ft is around 30Hz, ported in 12...

Sealed f3 in 4 cu ft is around 30Hz, ported in 12 cu ft is around 15Hz. The difference in maximum SPL is 8dB at 20Hz, 11dB at 15Hz. How much do you want to piss your neighbors off? :eek:
Forum: Speakers   02-21-2017, 01:14 PM
Replies: 16
Views: 295
Posted By Bill Fitzmaurice
Isolation devices do exactly the same thing that...

Isolation devices do exactly the same thing that high priced cables do: separate the unwary and uninformed from their money.
http://ethanwiner.com/speaker_isolation.htm

The reason why...
Forum: Speakers   02-21-2017, 11:40 AM
Replies: 16
Views: 295
Posted By Bill Fitzmaurice
'Decoupling' is snake oil as well. What goes...

'Decoupling' is snake oil as well. What goes through walls and ceilings are long wavelength low frequency sound waves, sourced from the driver cone and, in the case of a ported cab, the port. What...
Forum: Speakers   02-21-2017, 11:05 AM
Replies: 16
Views: 295
Posted By Bill Fitzmaurice
Snake oil.

Snake oil.
Forum: Speakers   02-21-2017, 10:57 AM
Replies: 12
Views: 120
Posted By Bill Fitzmaurice
55 in my living room, not counting those built in...

55 in my living room, not counting those built in to the TV, as they never get used.
Forum: DIY Speakers and Subs   02-21-2017, 06:43 AM
Replies: 33
Views: 972
Posted By Bill Fitzmaurice
Not necessarily. The movement of a cone will...

Not necessarily. The movement of a cone will create harmonics, at any level. The higher the level the longer the cone movement and the higher the % of harmonics created, even if the driver is still...
Forum: Audio Theory, Setup, and Chat   02-21-2017, 06:33 AM
Replies: 17
Views: 191
Posted By Bill Fitzmaurice
http://www.parts-express.com/dayton-audio-umm-6-us...

http://www.parts-express.com/dayton-audio-umm-6-usb-measurement-microphone--390-808
You don't need to calibrate at a specific level. 75dB is recommended, mainly because that's at least 20dB above...
Forum: DIY Speakers and Subs   02-20-2017, 07:57 PM
Replies: 33
Views: 972
Posted By Bill Fitzmaurice
It doesn't matter. When a driver gets pushed hard...

It doesn't matter. When a driver gets pushed hard enough it will create above bandwidth harmonics, which can reflect off bare surfaces inside the cab to reflect back to the cone and/or out the port,...
Forum: DIY Speakers and Subs   02-20-2017, 07:49 PM
Replies: 5
Views: 105
Posted By Bill Fitzmaurice
Can you see around corners?

Can you see around corners?
Forum: Speakers   02-20-2017, 07:47 PM
Replies: 15
Views: 173
Posted By Bill Fitzmaurice
That would only happen if the cables you replaced...

That would only happen if the cables you replaced were totally defective. For a perceived doubling of volume, a 10dB increase, with even 50 foot cables you'd have to go from 30 gauge to 12 gauge.
Forum: Car Audio, Video, and Nav   02-20-2017, 05:56 PM
Replies: 2
Views: 69
Posted By Bill Fitzmaurice
Wrong forum. ...

Wrong forum.
http://www.avsforum.com/forum/160-car-audio-video-nav/
Forum: DIY Speakers and Subs   02-20-2017, 05:53 PM
Replies: 5
Views: 105
Posted By Bill Fitzmaurice
The only 'must' rule is don't place the port...

The only 'must' rule is don't place the port where you can look through it and see the cone.
Forum: Audio Theory, Setup, and Chat   02-20-2017, 05:51 PM
Replies: 17
Views: 191
Posted By Bill Fitzmaurice
You still don't. Measuring response is far more...

You still don't. Measuring response is far more important than measuring levels. Get the USB mic. Pay once, cry once.
Forum: Speakers   02-20-2017, 03:40 PM
Replies: 15
Views: 173
Posted By Bill Fitzmaurice
To be accurate, they're not, 86dB would be a far...

To be accurate, they're not, 86dB would be a far more honest figure. Still, there's got to be something very wrong with them for the OP to get that result.
Forum: DIY Speakers and Subs   02-20-2017, 11:44 AM
Replies: 33
Views: 972
Posted By Bill Fitzmaurice
That's not what my testing and experience has...

That's not what my testing and experience has found. It won't have the effect in a sub as it does in a higher band width speaker, but even in a sub it can be beneficial, especially if the sub is...
Forum: DIY Speakers and Subs   02-20-2017, 11:40 AM
Replies: 20
Views: 301
Posted By Bill Fitzmaurice
Correct. That means you'd want the sub to have a...

Correct. That means you'd want the sub to have a half space f3 not higher than perhaps 25Hz.
Forum: Speakers   02-20-2017, 11:29 AM
Replies: 16
Views: 182
Posted By Bill Fitzmaurice
It does, and that's one of the reasons why having...

It does, and that's one of the reasons why having the center above or below doesn't make much, if any, difference. Mine is below, offset to one side, but the source is always heard as coming from the...
Forum: Speakers   02-20-2017, 11:22 AM
Replies: 16
Views: 295
Posted By Bill Fitzmaurice
An extra layer of 5/8" sheet rock on both sides...

An extra layer of 5/8" sheet rock on both sides of the walls, and solid oak doors. You're trying to contain 14 to 60 foot wavelengths. That's only accomplished with a lot of mass.
Forum: Speakers   02-20-2017, 07:44 AM
Replies: 16
Views: 182
Posted By Bill Fitzmaurice
I can't speak for others, but I always listen...

I can't speak for others, but I always listen with my ears, never my eyes. ;)
Forum: Speakers   02-20-2017, 07:16 AM
Replies: 15
Views: 173
Posted By Bill Fitzmaurice
If the individual speaker volumes can all be set...

If the individual speaker volumes can all be set to sound the same then nothing is broken. If the surround levels don't seem loud enough it's only because that's how they were mixed. If your personal...
Forum: DIY Speakers and Subs   02-19-2017, 09:16 PM
Replies: 20
Views: 301
Posted By Bill Fitzmaurice
Cabin gain starts at the frequency where the...

Cabin gain starts at the frequency where the longest room dimension is equal to 1/2 wavelength. With a very tight room up to 12dB/octave is possible, but don't assume that you'll get more than...
Forum: Subwoofers, Bass, and Transducers   02-19-2017, 07:45 PM
Replies: 18
Views: 246
Posted By Bill Fitzmaurice
Snake oil. The sound comes from the cone and...

Snake oil. The sound comes from the cone and port. Feet have no effect on that.
Forum: Speakers   02-19-2017, 07:38 PM
Replies: 16
Views: 182
Posted By Bill Fitzmaurice
My L/R are both up high, my center is down low....

My L/R are both up high, my center is down low. No issues at all.
Forum: Subwoofers, Bass, and Transducers   02-19-2017, 05:24 PM
Replies: 32
Views: 501
Posted By Bill Fitzmaurice
There is. When the drive voltage from the AVR is...

There is. When the drive voltage from the AVR is too low the signal to noise ratio will be lower. That tends not to be an issue with subs, as most noise occurs well above the sub woofer frequency...
Forum: Subwoofers, Bass, and Transducers   02-19-2017, 04:31 PM
Replies: 18
Views: 246
Posted By Bill Fitzmaurice
Help do what? Other than looking pretty.

Help do what? Other than looking pretty.
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