AVS Forum | Home Theater Discussions And Reviews - Search Results
Showing results 1 to 25 of 998
Search took 0.45 seconds.
Search: Keyword(s): ; Posts Made By: Bill Fitzmaurice
Forum: Subwoofers, Bass, and Transducers   02-22-2017, 01:59 PM
Replies: 12
Views: 155
Posted By Bill Fitzmaurice
Another trick is to find the best location for...

Another trick is to find the best location for one sub, chart the response, then find other locations where the response peaks and valleys of the first are offset by the peaks and valleys of the...
Forum: Subwoofers, Bass, and Transducers   02-22-2017, 01:55 PM
Replies: 5
Views: 64
Posted By Bill Fitzmaurice
That's usually the worst place to put subs. There...

That's usually the worst place to put subs. There are literally hundreds of threads here on that subject. After you determine where to place them for best results set their individual volumes as...
Forum: Subwoofers, Bass, and Transducers   02-22-2017, 01:50 PM
Replies: 15
Views: 131
Posted By Bill Fitzmaurice
So do many pro-sound power amps. Using an amp...

So do many pro-sound power amps. Using an amp like the TEAC one would place an electronic crossover between the source and the amp.
Forum: DIY Speakers and Subs   02-22-2017, 01:42 PM
Replies: 6
Views: 146
Posted By Bill Fitzmaurice
Frequency limited too. Used as intended, in a car...

Frequency limited too. Used as intended, in a car with music, cabin gain will allow them to work pretty well. For home theater they're not up to the task.
There is no work around to Hoffman's Iron...
Forum: Speakers   02-22-2017, 01:29 PM
Replies: 5
Views: 78
Posted By Bill Fitzmaurice
On the woofers the number 67 indicates Eminence,...

On the woofers the number 67 indicates Eminence, the number 8048 indicates produced the 48th week of 1968 or 1978, on the other 8039 the 39th week of 1968 or 1978. I doubt it's Klipsch, probably home...
Forum: DIY Speakers and Subs   02-22-2017, 11:44 AM
Replies: 1
Views: 34
Posted By Bill Fitzmaurice
You can get a reasonably good result nearfield...

You can get a reasonably good result nearfield with a gated measurement, which reduces the influence of the room. Even so they should all be measured in the same location. Measuring outdoors...
Forum: Subwoofers, Bass, and Transducers   02-22-2017, 09:38 AM
Replies: 12
Views: 155
Posted By Bill Fitzmaurice
That's the preferred method. It's not often...

That's the preferred method. It's not often recommended because of the very low percentage of sub owners who have UMIK or the like.
Forum: Audio Theory, Setup, and Chat   02-22-2017, 09:32 AM
Replies: 2
Views: 45
Posted By Bill Fitzmaurice
It doesn't work that way, because those drivers...

It doesn't work that way, because those drivers won't be identical other than size. There are roughly a dozen factors that combine to determine driver sensitivity and maximum output, with the cone...
Forum: Speakers   02-22-2017, 09:23 AM
Replies: 31
Views: 463
Posted By Bill Fitzmaurice
A solid core door is a must, hollow core doors...

A solid core door is a must, hollow core doors might as well not be there. Even a solid wood style/rail and panel door lacks the mass to stop low frequencies. A full 1 3/8" of solid material is what...
Forum: Speakers   02-22-2017, 06:51 AM
Replies: 31
Views: 463
Posted By Bill Fitzmaurice
It won't. Even if you used a platform of...

It won't. Even if you used a platform of sufficient density that it actually could prevent transmission of low frequencies, say six inches of solid concrete, long wavelengths will simply go around...
Forum: Subwoofers, Bass, and Transducers   02-21-2017, 08:32 PM
Replies: 15
Views: 131
Posted By Bill Fitzmaurice
It would be better, especially if they have an f3...

It would be better, especially if they have an f3 in the vicinity of 85Hz. But bottom line you'll never get a really good result doing it as you are. For subs and mains to integrate well they should ...
Forum: DIY Speakers and Subs   02-21-2017, 02:24 PM
Replies: 20
Views: 312
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: 31
Views: 463
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: 31
Views: 463
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: 31
Views: 463
Posted By Bill Fitzmaurice
Snake oil.

Snake oil.
Forum: Speakers   02-21-2017, 10:57 AM
Replies: 12
Views: 123
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: 34
Views: 1,033
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: 208
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: 34
Views: 1,033
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: 111
Posted By Bill Fitzmaurice
Can you see around corners?

Can you see around corners?
Forum: Speakers   02-20-2017, 07:47 PM
Replies: 16
Views: 189
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: 75
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: 111
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: 208
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: 16
Views: 189
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.
Showing results 1 to 25 of 998

 
Forum Jump: