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Forum: Speakers   02-27-2015, 03:47 PM
Replies: 10
Views: 143
Posted By Bill Fitzmaurice
Typically the B output is connected to the same...

Typically the B output is connected to the same power amp as the A output, so there's nothing to be gained.
Sony typically will only work well with 6 ohm or higher loads. It may work OK with 4 ohm,...
Forum: DIY Speakers and Subs   02-27-2015, 02:37 PM
Replies: 6
Views: 72
Posted By Bill Fitzmaurice
In the home those might work OK, but I'd never...

In the home those might work OK, but I'd never trust them for professional use. I've not yet found a knock-off connector that's roadworthy. For me it's only genuine Neutrik, Switchcraft, Amphenol or...
Forum: Speakers   02-27-2015, 02:29 PM
Replies: 20
Views: 175
Posted By Bill Fitzmaurice
You can cut the THD to the HF speaker section a...

You can cut the THD to the HF speaker section a lot more than that, as you can fully clip the LF amp while keeping the HF amp clean. That would be an unusual scenario, at least in consumer...
Forum: Speakers   02-27-2015, 12:36 PM
Replies: 20
Views: 175
Posted By Bill Fitzmaurice
That's going too far. Even low end speakers will...

That's going too far. Even low end speakers will sound better with active bi-amping, due to the lowered THD and IMD in the amplification stages, and the elimination of all the shortcomings of passive...
Forum: DIY Speakers and Subs   02-27-2015, 12:22 PM
Replies: 6
Views: 72
Posted By Bill Fitzmaurice
All you need is two conductor shielded. There's...

All you need is two conductor shielded. There's no need for a drain wire. There's no special mic cable for use with phantom power.
Forum: Speakers   02-27-2015, 12:07 PM
Replies: 20
Views: 175
Posted By Bill Fitzmaurice
If you don't remove the passive crossovers from...

If you don't remove the passive crossovers from the speakers then fully half the benefit of active bi-amping isn't realized.
That benefit comes from reduced THD by splitting the frequency pass bands...
Forum: Speakers   02-27-2015, 10:10 AM
Replies: 20
Views: 175
Posted By Bill Fitzmaurice
With friends like that...:rolleyes:

With friends like that...:rolleyes:
Forum: Speakers   02-27-2015, 08:22 AM
Replies: 20
Views: 175
Posted By Bill Fitzmaurice
Don't bi-amp. Do read this: ...

Don't bi-amp. Do read this:
http://www.chuckhawks.com/bi-wire_bi-amp.htm
Forum: Subwoofers, Bass, and Transducers   02-27-2015, 06:31 AM
Replies: 3
Views: 98
Posted By Bill Fitzmaurice
It's probably too loud. My sub is a foot behind...

It's probably too loud. My sub is a foot behind me, and I can't localize it when the system is correctly balanced. If I turn the sub up too loud I can localize it. Due to the difference in the...
Forum: Speakers   02-27-2015, 06:19 AM
Replies: 3
Views: 55
Posted By Bill Fitzmaurice
The last driver I toasted was a 300w EVM15B...

The last driver I toasted was a 300w EVM15B pro-sound woofer. It took less than a second to burn out the voice coil with a high powered transient pulse, so exposure time isn't necessarily a factor....
Forum: DIY Speakers and Subs   02-26-2015, 03:46 PM
Replies: 10
Views: 196
Posted By Bill Fitzmaurice
Maybe, maybe not. There are more variables in...

Maybe, maybe not. There are more variables in play. Remember that low pass filters are not brickwall, and that drivers create harmonics. With respect to direct radiating subs it's primarily those...
Forum: Speakers   02-26-2015, 03:39 PM
Replies: 17
Views: 222
Posted By Bill Fitzmaurice
How much is that in decibels? BTW, the correct...

How much is that in decibels? BTW, the correct term is inductive reactance.
Forum: Speakers   02-26-2015, 12:42 PM
Replies: 17
Views: 222
Posted By Bill Fitzmaurice
A bit late to this party you are. ...

A bit late to this party you are.
http://www.bcae1.com/images/swfs/speakerwireselectorassistant.swf

With cables of standard construction and average length capacitance and inductance are not an...
Forum: Speakers   02-26-2015, 12:36 PM
Replies: 8
Views: 83
Posted By Bill Fitzmaurice
+20dB is a one hundred fold increase in power, so...

+20dB is a one hundred fold increase in power, so damage to both the crossover components and drivers is a distinct possibility.
An SPL and THD sweep would show it. It's possible to damage the...
Forum: DIY Speakers and Subs   02-26-2015, 11:56 AM
Replies: 11
Views: 170
Posted By Bill Fitzmaurice
They don't have enough slope, and the corner...

They don't have enough slope, and the corner frequency isn't precise, as that depends on the input impedance of the amp.
Forum: DIY Speakers and Subs   02-26-2015, 11:53 AM
Replies: 10
Views: 196
Posted By Bill Fitzmaurice
All of it. Sound waves will reflect off all the...

All of it. Sound waves will reflect off all the panels, not just the back.
Forum: Speakers   02-26-2015, 06:57 AM
Replies: 10
Views: 143
Posted By Bill Fitzmaurice
Possibly. None of the pictures I've seen of them...

Possibly. None of the pictures I've seen of them are without the grille, so the tweeter position is unknown. If it is close to the top of the speaker then you could put the second speaker above the...
Forum: DIY Speakers and Subs   02-26-2015, 06:42 AM
Replies: 10
Views: 196
Posted By Bill Fitzmaurice
+1. A mattress topper has more foam and less air...

+1. A mattress topper has more foam and less air for a given nominal thickness.
Forum: Speakers   02-26-2015, 06:35 AM
Replies: 8
Views: 83
Posted By Bill Fitzmaurice
Yes. It can be manifested in a number of ways,...

Yes. It can be manifested in a number of ways, including altered response and higher THD.
Forum: DIY Speakers and Subs   02-25-2015, 08:27 PM
Replies: 10
Views: 196
Posted By Bill Fitzmaurice
How thick you need to go depends on how low the...

How thick you need to go depends on how low the frequencies are that you want to damp. 1 1/2 inch foam tends to be fine for mains operating above 80Hz, for a sub I'd go thicker. BTW, eggcrate foam...
Forum: Speakers   02-25-2015, 03:37 PM
Replies: 10
Views: 183
Posted By Bill Fitzmaurice
None. If that was the case recording studios...

None. If that was the case recording studios would use different speakers for mixing different genres. They don't. As is the case with any content you'll get the best results with speakers that give...
Forum: Subwoofers, Bass, and Transducers   02-25-2015, 01:33 PM
Replies: 5
Views: 165
Posted By Bill Fitzmaurice
+1. The same high decibel output at low...

+1. The same high decibel output at low frequencies that you hear as great bass is what rattles things. You can't have the one without the other, so if you want great bass you have to make sure that...
Forum: Audio Theory, Setup, and Chat   02-25-2015, 01:26 PM
Replies: 16
Views: 274
Posted By Bill Fitzmaurice
A voltage source will deliver the same voltage...

A voltage source will deliver the same voltage into any impedance load, so the answer is no. However, you can run into loading issues when the driven impedance is too low compared to the source. That...
Forum: Subwoofers, Bass, and Transducers   02-25-2015, 09:50 AM
Replies: 12
Views: 212
Posted By Bill Fitzmaurice
It might not, but if that's the case I consider...

It might not, but if that's the case I consider it a design flaw, unless the port is rear or bottom firing, where it's inaccessible to little ones...or mice.
Forum: Subwoofers, Bass, and Transducers   02-25-2015, 07:53 AM
Replies: 12
Views: 212
Posted By Bill Fitzmaurice
You don't have grilles on your speakers with a...

You don't have grilles on your speakers with a child in the house? That's just asking for trouble.
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