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Search: Keyword(s): ; Posts Made By: Bill Fitzmaurice
Forum: DIY Speakers and Subs   02-08-2016, 03:34 PM
Replies: 9
Views: 144
Posted By Bill Fitzmaurice
Only a very poorly designed amp would suffer that...

Only a very poorly designed amp would suffer that result, especially one with the limited band width of a sub amp.
Forum: Speakers   02-08-2016, 03:23 PM
Replies: 4
Views: 79
Posted By Bill Fitzmaurice
Anything less than 1dB loss is inaudible. You...

Anything less than 1dB loss is inaudible. You could use 20ga or even 26ga as far as insertion loss is concerned, but they would lack the necessary current capacity, so in your case 18ga is the...
Forum: Speakers   02-08-2016, 03:22 PM
Replies: 4
Views: 75
Posted By Bill Fitzmaurice
Power isn't the issue, because power is the...

Power isn't the issue, because power is the product of voltage and current. The lower the impedance the less voltage it takes to reach the same levels. That seems to be a good thing, but the lower...
Forum: Speakers   02-08-2016, 02:08 PM
Replies: 4
Views: 79
Posted By Bill Fitzmaurice
Use this to calculate it: ...

Use this to calculate it:
http://www.bcae1.com/images/swfs/speakerwireselectorassistant.swf
Forum: Subwoofers, Bass, and Transducers   02-08-2016, 02:05 PM
Replies: 4
Views: 60
Posted By Bill Fitzmaurice
Try this: ...

Try this:
http://www.homedepot.com/p/TrafficMASTER-Black-24-in-x-36-in-Anti-Fatigue-Vinyl-Foam-Commercial-Mat-60-571-0900-20000300/202015909

With luck the sub feet will indent into the pad and...
Forum: DIY Speakers and Subs   02-08-2016, 02:00 PM
Replies: 9
Views: 144
Posted By Bill Fitzmaurice
The frequencies at which ferrites have an effect...

The frequencies at which ferrites have an effect are so far outside the bandwidth of audio, let alone a subwoofer, that it wouldn't matter. Besides, ferrites are so inexpensive that it they were...
Forum: DIY Speakers and Subs   02-08-2016, 01:56 PM
Replies: 17
Views: 1,036
Posted By Bill Fitzmaurice
Only if the sub enclosure panels vibrate to the...

Only if the sub enclosure panels vibrate to the point that the sub can only be described as defective. Even if that's the case all that's required to 'isolate' the sub is rubber feet or an...
Forum: Speakers   02-08-2016, 01:36 PM
Replies: 15
Views: 777
Posted By Bill Fitzmaurice
+1, which explains why most commercial studios...

+1, which explains why most commercial studios will have at least three sets. About the only place you'd find nearfields only is home project studios. You'd be hard pressed to call a JBL M2 a...
Forum: Subwoofers, Bass, and Transducers   02-08-2016, 11:24 AM
Replies: 1
Views: 54
Posted By Bill Fitzmaurice
It depends on the size of the room. If it's small...

It depends on the size of the room. If it's small compared to the wavelengths produced then the room boundaries will define the result as much as the subs themselves, in which case spreading the subs...
Forum: Audio Theory, Setup, and Chat   02-08-2016, 06:15 AM
Replies: 2
Views: 34
Posted By Bill Fitzmaurice
You will need a transformer to deliver the...

You will need a transformer to deliver the correct voltage. Speed may be affected by 50Hz versus 60Hz, but that depends on whether or not the turntable synchronizes to the AC line frequency. Some do,...
Forum: DIY Speakers and Subs   02-07-2016, 07:28 PM
Replies: 17
Views: 1,036
Posted By Bill Fitzmaurice
If it's bouncing about it could, but it shouldn't...

If it's bouncing about it could, but it shouldn't bounce about, and if it does something as simple and inexpensive as this will take care of it:...
Forum: Subwoofers, Bass, and Transducers   02-07-2016, 07:10 PM
Replies: 10
Views: 365
Posted By Bill Fitzmaurice
Not if the distance from the LP to room walls or...

Not if the distance from the LP to room walls or even the ceiling results in its being in a null zone.
Forum: DIY Speakers and Subs   02-07-2016, 07:05 PM
Replies: 17
Views: 1,036
Posted By Bill Fitzmaurice
What causes things in the room to vibrate is what...

What causes things in the room to vibrate is what causes your eardrums to vibrate so that you hear the sub: the long wavelengths produced by the movement of the driver cone. If you want objects to...
Forum: Speakers   02-07-2016, 06:56 PM
Replies: 17
Views: 484
Posted By Bill Fitzmaurice
I had that happen to me once when I posted that...

I had that happen to me once when I posted that link here, and I got flagged for it. :mad:
What's odd is that when I put a link in a post I always click on it myself to make sure that it's working....
Forum: Receivers, Amps, and Processors   02-07-2016, 02:04 PM
Replies: 8
Views: 101
Posted By Bill Fitzmaurice
Not that good. Reference simply means having a...

Not that good. Reference simply means having a system capable of reaching 85dB with 20dB of headroom at the LP.

Where calibration is concerned there's nothing magic about a 75dB level. It's...
Forum: Subwoofers, Bass, and Transducers   02-07-2016, 01:51 PM
Replies: 10
Views: 365
Posted By Bill Fitzmaurice
Opposing drivers cancel motive forces that might...

Opposing drivers cancel motive forces that might cause the sub itself to move, but they don't cancel the low frequency long wavelengths that would cause a table in such close proximity to vibrate...
Forum: Speakers   02-07-2016, 01:39 PM
Replies: 25
Views: 487
Posted By Bill Fitzmaurice
'Noticed' is the correct term. Blindfolded you...

'Noticed' is the correct term. Blindfolded you wouldn't be able to tell the difference, because imaging is 100% in the midrange and high frequencies well above where there's any difference in the...
Forum: Speakers   02-07-2016, 01:31 PM
Replies: 15
Views: 777
Posted By Bill Fitzmaurice
There is when it's prominently displayed on the...

There is when it's prominently displayed on the studio's website and other advertising. Musicians are just as prone to fall prey to the 'if it costs a lot it must be good' syndrome as anyone else.
Forum: DIY Speakers and Subs   02-07-2016, 10:00 AM
Replies: 97
Views: 1,443
Posted By Bill Fitzmaurice
Try this: ...

Try this:
https://www.youtube.com/watch?v=MXW0bx_Ooq4
Forum: DIY Speakers and Subs   02-07-2016, 08:24 AM
Replies: 97
Views: 1,443
Posted By Bill Fitzmaurice
I use screws. If the driver is heavy I'll add...

I use screws. If the driver is heavy I'll add some small plywood blocks to the back of the baffle for better retention, unless the screws go into braces, in which case they're not going anywhere.
Forum: DIY Speakers and Subs   02-07-2016, 08:20 AM
Replies: 17
Views: 1,036
Posted By Bill Fitzmaurice
All you need is rubber feet or a thick vinyl pad....

All you need is rubber feet or a thick vinyl pad. Anything more sophisticated or expensive won't work any better. ...
Forum: Subwoofers, Bass, and Transducers   02-07-2016, 07:51 AM
Replies: 10
Views: 365
Posted By Bill Fitzmaurice
Unless the table is very heavy it's going to...

Unless the table is very heavy it's going to vibrate. It might even need to be bolted to the floor.
Forum: DIY Speakers and Subs   02-07-2016, 07:41 AM
Replies: 97
Views: 1,443
Posted By Bill Fitzmaurice
It's not necessary, unless you're using a backing...

It's not necessary, unless you're using a backing piece to allow flush mounting of the driver. Bracing the baffle to the back is sufficient, which is shown in my first illustration back on the first...
Forum: DIY Speakers and Subs   02-07-2016, 07:34 AM
Replies: 8
Views: 94
Posted By Bill Fitzmaurice
Add the additional volume It doesn't matter,...

Add the additional volume
It doesn't matter, though you should not make ports smaller than 2 inches on any axis.
Anything below .2 at maximum anticipated power input is fine
There's no such thing...
Forum: DIY Speakers and Subs   02-07-2016, 07:26 AM
Replies: 97
Views: 1,443
Posted By Bill Fitzmaurice
This picture shows the end on view of braces...

This picture shows the end on view of braces connecting two panels. If the panels are 1/2" thick the addition of the red brace increases the panel stiffness to the equivalent of 1" thick panels. The...
Showing results 1 to 25 of 999

 
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