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Search: Posts Made By: Bill Fitzmaurice
Forum: DIY Speakers and Subs   08-28-2015, 02:41 PM
Replies: 11
Views: 283
Posted By Bill Fitzmaurice
In part. Excursion goes up as frequency goes...

In part. Excursion goes up as frequency goes down, be it ported or sealed. Below Fb a ported box excursion will go up at a faster rate than sealed. That can give sealed an advantage, but where subs...
Forum: Audio Theory, Setup, and Chat   08-28-2015, 02:30 PM
Replies: 8
Views: 84
Posted By Bill Fitzmaurice
+/-1.5dB is close enough. For that matter +/- 3dB...

+/-1.5dB is close enough. For that matter +/- 3dB is considered as close to flat as one really needs. That's why you have a master volume control on the sub, as well as trim control in the AVR. Turn...
Forum: Audio Theory, Setup, and Chat   08-28-2015, 11:32 AM
Replies: 8
Views: 84
Posted By Bill Fitzmaurice
The SVS advice is odd, typically you want the...

The SVS advice is odd, typically you want the same level across the board. At any rate, you only need to use two bands of EQ on the sub, 30 and 40Hz. Take them both down to 72dB. That makes your sub...
Forum: Subwoofers, Bass, and Transducers   08-28-2015, 05:01 AM
Replies: 31
Views: 572
Posted By Bill Fitzmaurice
FWIW there's no such thing as imaging in the...

FWIW there's no such thing as imaging in the subwoofer frequency band width, so whatever it is that you're having issues with it's not imaging.
Agreed.
Forum: Subwoofers, Bass, and Transducers   08-28-2015, 04:52 AM
Replies: 1
Views: 64
Posted By Bill Fitzmaurice
If the sub buzzes when it's plugged into the wall...

If the sub buzzes when it's plugged into the wall but there is no input cable plugged into it the sub is defective.
Forum: Subwoofers, Bass, and Transducers   08-27-2015, 03:17 PM
Replies: 4
Views: 121
Posted By Bill Fitzmaurice
The original foams only lasted about 15-20 years,...

The original foams only lasted about 15-20 years, and started disintegrating in the 80s, so that's when the formulations were changed. I was re-foaming drivers in 1982. Anything from the late 80s or...
Forum: DIY Speakers and Subs   08-27-2015, 08:05 AM
Replies: 27
Views: 500
Posted By Bill Fitzmaurice
Man cave, where you can do what you want. :D ...

Man cave, where you can do what you want. :D
DIY subs tend to be larger than commercial, because the average DIYer understands how speakers work and will build them as large as they need to be to...
Forum: Speakers   08-27-2015, 05:34 AM
Replies: 57
Views: 901
Posted By Bill Fitzmaurice
Hoffman's Iron Law. It trades off low frequency...

Hoffman's Iron Law. It trades off low frequency extension for high sensitivity.
Forum: Subwoofers, Bass, and Transducers   08-27-2015, 05:30 AM
Replies: 16
Views: 162
Posted By Bill Fitzmaurice
The major problem with long wire connections to...

The major problem with long wire connections to subs is the potential for ground loop noise, as that noise increases proportionally to the wire length squared. Wireless is immune to ground looping,...
Forum: DIY Speakers and Subs   08-27-2015, 05:21 AM
Replies: 11
Views: 283
Posted By Bill Fitzmaurice
That's not the case. The enclosure acts like a...

That's not the case. The enclosure acts like a storage capacitor, delaying the port output sufficiently so that it's in phase with the driver output at and above Fb. Only below Fb is port radiation...
Forum: DIY Speakers and Subs   08-26-2015, 08:01 PM
Replies: 11
Views: 283
Posted By Bill Fitzmaurice
Yes. Both. Peak port output is at the tuning...

Yes. Both.
Peak port output is at the tuning frequency, extending on average 1/3 octave above and below the tuning frequency. Minimum cone excursion is at that same frequency.
That's not bad...
Forum: Subwoofers, Bass, and Transducers   08-26-2015, 03:06 PM
Replies: 13
Views: 228
Posted By Bill Fitzmaurice
Without seeing all of the pertinent driver data...

Without seeing all of the pertinent driver data one can't say for sure, but what's shown in the above graph probably reflects the excursion limit of the driver. At low frequencies that limit is...
Forum: Speakers   08-26-2015, 01:26 PM
Replies: 8
Views: 144
Posted By Bill Fitzmaurice
If you do that chances are the Atmos content will...

If you do that chances are the Atmos content will be indistinguishable from the other content.
Forum: Speakers   08-26-2015, 01:23 PM
Replies: 17
Views: 309
Posted By Bill Fitzmaurice
Those looking for used often don't do their...

Those looking for used often don't do their research. The seller will state the original MSRP, and a buyer who doesn't know that new gear typically sells for well under MSRP might thinking they're...
Forum: DIY Speakers and Subs   08-26-2015, 10:29 AM
Replies: 14
Views: 341
Posted By Bill Fitzmaurice
The OPs experience shows the benefit of...

The OPs experience shows the benefit of immediately testing, if not actually breaking in, a driver when you get it. If it's got a defect putting 25Hz at 12v into it overnight will probably bring it...
Forum: Subwoofers, Bass, and Transducers   08-25-2015, 10:26 AM
Replies: 18
Views: 201
Posted By Bill Fitzmaurice
This: ...

This:
http://www.homedepot.com/p/TrafficMASTER-Black-24-in-x-36-in-Anti-Fatigue-Vinyl-Foam-Commercial-Mat-60-571-0900-20000300/202015909
Forum: Speakers   08-25-2015, 10:21 AM
Replies: 22
Views: 296
Posted By Bill Fitzmaurice
I'm referring to the two 4 inch woofers of the...

I'm referring to the two 4 inch woofers of the Motion 8. But as far as that goes I wouldn't run the surrounds lower than 100Hz either. Four inch drivers are only capable of so much, and will easily...
Forum: Speakers   08-25-2015, 08:51 AM
Replies: 22
Views: 296
Posted By Bill Fitzmaurice
I wouldn't run a pair of fours lower than 100Hz....

I wouldn't run a pair of fours lower than 100Hz. I run fours at 80Hz, but my center has six of them, my L/R eight each.
Forum: Speakers   08-25-2015, 08:19 AM
Replies: 22
Views: 296
Posted By Bill Fitzmaurice
There will be very little change with time. Break...

There will be very little change with time. Break in primarily softens woofer surrounds and spiders, giving a bit lower extension, but the change isn't particularly noticeable. Distortion is the...
Forum: Subwoofers, Bass, and Transducers   08-25-2015, 05:09 AM
Replies: 16
Views: 431
Posted By Bill Fitzmaurice
The higher the frequency the louder it must be to...

The higher the frequency the louder it must be to have the same impact. There comes a point where there is insufficient room pressurization to give the chest thump sensation, roughly above 200Hz, no...
Forum: Subwoofers, Bass, and Transducers   08-24-2015, 07:06 PM
Replies: 16
Views: 431
Posted By Bill Fitzmaurice
No, a snare doesn't go low. Kick drum, yes, that...

No, a snare doesn't go low. Kick drum, yes, that along with electric bass is the major source of chest thump at large concerts.
Forum: Subwoofers, Bass, and Transducers   08-24-2015, 04:29 PM
Replies: 16
Views: 431
Posted By Bill Fitzmaurice
It won't, for the reasons already stated. Even...

It won't, for the reasons already stated. Even identical systems will be different in different rooms, and within any given room SPL will vary with the placement of the LP. You might as well be...
Forum: DIY Speakers and Subs   08-24-2015, 05:18 AM
Replies: 12
Views: 297
Posted By Bill Fitzmaurice
My smaller horns (T18, Table Tuba) can come in...

My smaller horns (T18, Table Tuba) can come in that low. Even a Tuba HT can if you go with the least expensive suitable driver.
Labor costs, shipping costs and the low WAF of large cabs. Commercial...
Forum: Subwoofers, Bass, and Transducers   08-23-2015, 08:17 PM
Replies: 16
Views: 431
Posted By Bill Fitzmaurice
105dB at the LP. It's not, as it doesn't take...

105dB at the LP.
It's not, as it doesn't take into consideration the sensitivity or frequency response of the sub, nor the room response.
Forum: Subwoofers, Bass, and Transducers   08-23-2015, 02:09 PM
Replies: 3
Views: 106
Posted By Bill Fitzmaurice
I'd pass on that. You shouldn't have to jump...

I'd pass on that. You shouldn't have to jump through hoops to make sure they work. If the seller is honest and wants to make a sale he'll provide the wherewithal to test them.
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