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Forum: DIY Speakers and Subs   08-27-2014, 05:21 AM
Replies: 5
Views: 74
Posted By Bill Fitzmaurice
What that's telling you is that you shouldn't use...

What that's telling you is that you shouldn't use it with 4kW. The thermal rating is what the voice coil will handle without burning up, not what you should expect the speaker to run at. My car...
Forum: Subwoofers, Bass, and Transducers   08-27-2014, 05:11 AM
Replies: 20
Views: 270
Posted By Bill Fitzmaurice
If you look at his posting history you'll see he...

If you look at his posting history you'll see he always has an agenda.
Forum: HDTV Programming   08-27-2014, 05:04 AM
Replies: 566
Views: 18,633
Posted By Bill Fitzmaurice
We've now seen the transition from action...

We've now seen the transition from action thriller to soap opera, a show in search of a plot to keep it going for another season, or two, or five. I got sucked into it with 'Lost' and 'Prison Break',...
Forum: Speakers   08-26-2014, 07:01 PM
Replies: 2
Views: 41
Posted By Bill Fitzmaurice
It could be anything from a bad HF driver to a...

It could be anything from a bad HF driver to a blown crossover component to a loose wire.
Forum: Subwoofers, Bass, and Transducers   08-26-2014, 04:28 PM
Replies: 4
Views: 100
Posted By Bill Fitzmaurice
The area of the port was reduced by the addition...

The area of the port was reduced by the addition of the straws, lowering the tuning of the cab. But that should have no effect on vibration. For that matter, what vibration?
Forum: Audio theory, Setup and Chat   08-26-2014, 08:59 AM
Replies: 15
Views: 294
Posted By Bill Fitzmaurice
It's worse than that, it's an MMTMM. It does list...

It's worse than that, it's an MMTMM. It does list two crossover frequencies to the tweeter, 1100 and 1400Hz, so apparently the outboard midbasses are crossed lower. The problem is that in a...
Forum: DIY Speakers and Subs   08-26-2014, 07:43 AM
Replies: 17
Views: 251
Posted By Bill Fitzmaurice
Chances are you won't be able to get them....

Chances are you won't be able to get them. Besides, if the cabs were properly designed they're already the correct size.
Forum: Audio theory, Setup and Chat   08-25-2014, 02:29 PM
Replies: 10
Views: 190
Posted By Bill Fitzmaurice
If it makes a hard knocking sound when you rap it...

If it makes a hard knocking sound when you rap it with your knuckles it's going to reflect high frequencies like mad. Textured wall paper is thick, and soft to the touch. No hard knocking when you...
Forum: DIY Speakers and Subs   08-25-2014, 02:24 PM
Replies: 6
Views: 188
Posted By Bill Fitzmaurice
It suffers the typical malady of band-pass boxes,...

It suffers the typical malady of band-pass boxes, it's a one-note wonder. Their own SPL charts show that to be the case.
Forum: Audio theory, Setup and Chat   08-25-2014, 01:14 PM
Replies: 10
Views: 190
Posted By Bill Fitzmaurice
Good Not good Good Good. Three out of...

Good
Not good
Good
Good.
Three out of four ain't bad. The fourth element is the walls. It would take extensive, and not the least bit invisible, traps to cut down on the wall reflections. I have...
Forum: Speakers   08-25-2014, 11:49 AM
Replies: 29
Views: 686
Posted By Bill Fitzmaurice
Most DIY speakers, kit or scratch built, have...

Most DIY speakers, kit or scratch built, have better drivers and higher quality crossover components than most commercial speakers. That's because DIYers know what drivers and other components are...
Forum: Audio theory, Setup and Chat   08-25-2014, 11:42 AM
Replies: 10
Views: 190
Posted By Bill Fitzmaurice
I don't see anything in the sweeps that indicates...

I don't see anything in the sweeps that indicates the need for bass traps per se, but you could stand some reflection taming. What's on the floor? What's the ceiling material? Walls? A small amount...
Forum: DIY Speakers and Subs   08-25-2014, 11:36 AM
Replies: 6
Views: 188
Posted By Bill Fitzmaurice
I'm not impressed with that design either. A...

I'm not impressed with that design either. A friends of mine built one and concluded it was aptly named, as it was really good at killing drivers. :mad:
Forum: Speakers   08-25-2014, 07:57 AM
Replies: 29
Views: 686
Posted By Bill Fitzmaurice
True, what we're talking about is speakers...

True, what we're talking about is speakers optimized for operation above 70Hz or so, as opposed to speakers intended for use down to 35Hz or so. To cover that lower octave with equal sensitivity...
Forum: Audio theory, Setup and Chat   08-25-2014, 05:08 AM
Replies: 6
Views: 223
Posted By Bill Fitzmaurice
Technically there's no such thing as 'RCA cable'....

Technically there's no such thing as 'RCA cable'. The plugs are RCA. Interconnect cables using RCA plugs are often called RCA cables, but that's a misnomer, they're correctly referred to coaxial...
Forum: Speakers   08-25-2014, 05:00 AM
Replies: 29
Views: 686
Posted By Bill Fitzmaurice
A single 5 inch driver is going to struggle going...

A single 5 inch driver is going to struggle going to 80Hz at all, let alone with headroom. I wouldn't consider less than a 2x6.5 bookshelf for a serious system.
Cabin gain begins at the frequency...
Forum: Speakers   08-24-2014, 01:41 PM
Replies: 29
Views: 686
Posted By Bill Fitzmaurice
That's the operative question. If the original...

That's the operative question. If the original bookshelves were just plain too small to comfortably reach 70-80Hz with plenty of headroom then towers might give a better result. But so would...
Forum: DIY Speakers and Subs   08-24-2014, 07:17 AM
Replies: 8
Views: 208
Posted By Bill Fitzmaurice
Look at the SPL chart for a floor stander and a...

Look at the SPL chart for a floor stander and a dedicated top. Cover both of them below 80Hz. What's the advantage to the floor stander? :confused:
Floor standers are large because they have to be...
Forum: DIY Speakers and Subs   08-24-2014, 06:16 AM
Replies: 8
Views: 208
Posted By Bill Fitzmaurice
If you're going to run subs you don't want...

If you're going to run subs you don't want towers, you want dedicated tops that only go to 70Hz or so. Towers are for when you don't have subs handling the low end.
Forum: DIY Speakers and Subs   08-24-2014, 06:09 AM
Replies: 6
Views: 188
Posted By Bill Fitzmaurice
The 6dB peak at 80Hz won't give 'warmth and great...

The 6dB peak at 80Hz won't give 'warmth and great low end punch', it will give a midbass boom. That peak is the result of the cab being tuned way too high, partly the result of the port area being...
Forum: DIY Speakers and Subs   08-24-2014, 05:46 AM
Replies: 3
Views: 147
Posted By Bill Fitzmaurice
If you volume match them to both producing 75dB...

If you volume match them to both producing 75dB with a test tone, then turn the system down 6dB by reducing the voltage swing by 1/2, they'll both be producing 69dB. Double the voltage swing for an...
Forum: Speakers   08-23-2014, 03:09 PM
Replies: 7
Views: 228
Posted By Bill Fitzmaurice
Not as long as you don't try to use them below...

Not as long as you don't try to use them below their rated -3dB low frequency limit.
High sensitivity speakers go louder with less power than low sensitivity. If you want a system that goes...
Forum: DIY Speakers and Subs   08-23-2014, 02:28 PM
Replies: 3
Views: 147
Posted By Bill Fitzmaurice
If they're level matched at one gain setting...

If they're level matched at one gain setting they'll be level matched at any gain setting, unless you drive any of them beyond their nominal linear response range, ie., past xmax.
Forum: Speakers   08-23-2014, 01:41 PM
Replies: 29
Views: 686
Posted By Bill Fitzmaurice
I'm not wild about their sub specs. They show...

I'm not wild about their sub specs. They show maximum output at 20-31.5Hz at 110dB, 12dB lower than from 40-63Hz, and that's after EQ. That would be OK in a room no larger than 20 feet or so on the...
Forum: Speakers   08-23-2014, 01:29 PM
Replies: 7
Views: 228
Posted By Bill Fitzmaurice
High sensitivity/high Fs/low Q drivers. They...

High sensitivity/high Fs/low Q drivers. They don't go as low in sealed cabs as lower sensitivity/low Fs/high Q drivers. That's the trade off required to get their high sensitivity. I said 'in most...
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