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Forum: DIY Speakers and Subs   09-21-2014, 07:52 PM
Replies: 14
Views: 170
Posted By Bill Fitzmaurice
If the two subs were placed close together at the...

If the two subs were placed close together at the same end of the room and there was a total of 10ms differential in their time align relative to the LP that 10ms would equal 1/2 wavelength, 11.3...
Forum: Speakers   09-21-2014, 07:31 PM
Replies: 13
Views: 167
Posted By Bill Fitzmaurice
Thanks, I hadn't seen that. If the drivers are...

Thanks, I hadn't seen that. If the drivers are wired with correct polarity (not phase, they're related but not the same thing) and the two speakers cancel each other then there is a polarity flip...
Forum: DIY Speakers and Subs   09-21-2014, 05:17 PM
Replies: 14
Views: 170
Posted By Bill Fitzmaurice
What do your measurements show?

What do your measurements show?
Forum: DIY Speakers and Subs   09-21-2014, 05:03 PM
Replies: 7
Views: 109
Posted By Bill Fitzmaurice
If they have actual subs in there then they will...

If they have actual subs in there then they will need to be separately amplified. Your AVR doesn't have that ability.
Forum: DIY Speakers and Subs   09-21-2014, 04:58 PM
Replies: 14
Views: 170
Posted By Bill Fitzmaurice
The 4.8ms difference between the two is inaudible...

The 4.8ms difference between the two is inaudible within the subwoofer pass band, so it really doesn't matter anyway. If that 4.8ms was above 200Hz then it would be of some concern.
Forum: Speakers   09-21-2014, 04:50 PM
Replies: 13
Views: 167
Posted By Bill Fitzmaurice
When Audyssey says one thing and the results say...

When Audyssey says one thing and the results say something else it's the results that matter. There is one other possibility, that being at what frequency Audyssey takes its polarity measurements. If...
Forum: Speakers   09-21-2014, 03:40 PM
Replies: 14
Views: 181
Posted By Bill Fitzmaurice
Absolutely, and the price paid for 'as good as it...

Absolutely, and the price paid for 'as good as it gets' keeps coming down. The processors are computers. How's your current computer compare in bang for the buck compared to what you were using two...
Forum: Speakers   09-21-2014, 03:09 PM
Replies: 14
Views: 181
Posted By Bill Fitzmaurice
The difference between low end and high end...

The difference between low end and high end speakers is clearly audible, to a point, that point being around $5k per speaker, beyond which about all you get for more money spent is being able to brag...
Forum: DIY Speakers and Subs   09-21-2014, 02:59 PM
Replies: 7
Views: 109
Posted By Bill Fitzmaurice
Do you mean dual binding posts? That's for...

Do you mean dual binding posts? That's for so-called 'passive bi-amping', which does nothing. There originally would have been metal jumpers to connect the two sets of posts together. Assuming you've...
Forum: Speakers   09-21-2014, 02:48 PM
Replies: 6
Views: 82
Posted By Bill Fitzmaurice
In many cases to prevent the impedance load from...

In many cases to prevent the impedance load from being too low when running both zones they're series wired when both are in use. If the speakers have the same impedance that halves the voltage swing...
Forum: Subwoofers, Bass, and Transducers   09-20-2014, 07:12 PM
Replies: 4
Views: 145
Posted By Bill Fitzmaurice
Down firing has the same benefits as aiming it at...

Down firing has the same benefits as aiming it at a corner or a wall.
Forum: Subwoofers, Bass, and Transducers   09-20-2014, 02:27 PM
Replies: 4
Views: 145
Posted By Bill Fitzmaurice
The direction that the port aims makes no...

The direction that the port aims makes no difference. The direction the driver aims does, though probably not for the reason you might think. Aiming the driver at the corner or wall adds a bit of...
Forum: DIY Speakers and Subs   09-20-2014, 02:16 PM
Replies: 1
Views: 103
Posted By Bill Fitzmaurice
A transform circuit counters the 12dB/octave roll...

A transform circuit counters the 12dB/octave roll off of a sealed speaker with a corresponding 12dB/octave EQ boost. Typical shelving filters are only 6dB/octave.
Forum: Speakers   09-20-2014, 07:04 AM
Replies: 19
Views: 421
Posted By Bill Fitzmaurice
As to whether a speaker is sensitivity rated...

As to whether a speaker is sensitivity rated 2.83v/1m or 1w/1m, in both cases current and power are never actually involved in the measurement. The driver/speaker is measured with a constant voltage...
Forum: Speakers   09-20-2014, 06:45 AM
Replies: 42
Views: 675
Posted By Bill Fitzmaurice
All amps don't sound the same. There are...

All amps don't sound the same. There are differences based on their frequency response, power capacity, THD and so forth. If they don't have similar specs they will sound different. If they sound...
Forum: Speakers   09-19-2014, 04:46 PM
Replies: 19
Views: 421
Posted By Bill Fitzmaurice
We aren't, you are. The fact that you are...

We aren't, you are. The fact that you are indicates that you don't know how amps and speakers work. With all due respect, you should reconsider advising others when you are the one who should be...
Forum: Speakers   09-19-2014, 04:40 PM
Replies: 42
Views: 675
Posted By Bill Fitzmaurice
The reverse is also true. The difference is that...

The reverse is also true. The difference is that oddiophiles never arrive at their conclusions via blind testing, nor do they believe in specs. They do, however, believe in pixie dust, and the notion...
Forum: Speakers   09-19-2014, 01:00 PM
Replies: 42
Views: 675
Posted By Bill Fitzmaurice
It won't be 'better', it will be different. The...

It won't be 'better', it will be different. The primary limiting factor of how much clean power any AVR or amp can deliver is the power supply. AVRs may claim to put out, for instance, 5x100w or...
Forum: Subwoofers, Bass, and Transducers   09-19-2014, 12:44 PM
Replies: 16
Views: 320
Posted By Bill Fitzmaurice
Google Room EQ Wizard (REW).

Google Room EQ Wizard (REW).
Forum: Speakers   09-19-2014, 12:37 PM
Replies: 19
Views: 421
Posted By Bill Fitzmaurice
Fixed voltage. About that there is no room for...

Fixed voltage. About that there is no room for debate. An amp delivers equal voltage no matter what the load impedance, within the capabilities of the amp to also supply the necessary current. That's...
Forum: Speakers   09-19-2014, 09:30 AM
Replies: 42
Views: 675
Posted By Bill Fitzmaurice
Ask said people how subs in cars and headphones...

Ask said people how subs in cars and headphones can work well below 50-60Hz. :rolleyes:
Forum: Speakers   09-19-2014, 09:25 AM
Replies: 19
Views: 421
Posted By Bill Fitzmaurice
A 6 ohm limit is common with many receivers and...

A 6 ohm limit is common with many receivers and AVRs.
Forum: Speakers   09-19-2014, 05:48 AM
Replies: 19
Views: 421
Posted By Bill Fitzmaurice
At small signal levels the four ohm would be 3dB...

At small signal levels the four ohm would be 3dB louder. Maximum SPL would be the same, because how loud a speaker goes isn't based on power, it's based on the driver excursion limit. That is not...
Forum: Audio theory, Setup and Chat   09-18-2014, 03:58 PM
Replies: 12
Views: 193
Posted By Bill Fitzmaurice
Boom box.

Boom box.
Forum: Speakers   09-18-2014, 11:37 AM
Replies: 5
Views: 96
Posted By Bill Fitzmaurice
For the best imaging of the left/right speakers...

For the best imaging of the left/right speakers they should be at least 2/3 as far apart as the distance from the screen to the listening position. Having them only five feet apart would be OK if the...
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