I don't understand the BFD clipping meter. Please help.

[thewire]

Thanks Andysu. I have thought about one of these DCX2496 before and it keeps looking more and more like what I need. You can see on my graphs here my subs require a bit of tweeking after the crossover as the slope is not steep enough. When I equalize from a 80Hz crossover point and eq the 90Hz bump, it results in a flatter looking response for my left and right channels.

The center I checked out and it is in phase according to my volt meter. I went inside and removed some extra damping material I added in there some years ago, and the extra dip went away. I also noticed my new replacement tweeter was out-of-phase in comparrison to my other mains. It's no wonder I was having so many problems with it. Now this makes me wonder if the extra damping material I placed behind the lower drivers in my towers that had none are not having some kind of negative effect. I'm also not sure if increasing the volume in my subs by removing the displacement caused by the plate amps enclosures is not somehow increasing the output above the crossover area to high. When I measured near field I did not notice such a bump however so it could only be something to do with my room modes at 80Hz which I was aware of when designing the room. So I might be able to correct this with a custom roll-off instead of using the eq to do so. It makes it difficult to set levels when I need to add eq after my crossover, but if I do calibrations in REW with sweeps instead of using these Pink Noises to set levels I get it looking better.

I tried this time with the polarity on all my subs reversed and I also checked the center to see that it was in-phase with the voltmeter afterwards. I'm not sure which was left or right here but the sub unequalized is purple, the response without subs of the center is in black, and the center is still blue. I will think about the DCX2496. I should be getting some tax return money sometime soon.



edit: now getting 98dB in Jurrasic park and the room sounds alright, bit loud though.

[Andysu]

Afternoon Wire, Its chilly here in UK! We had mild snow fall this afternoon yippy!

I’d think hard if I was you. I was gutted when I saw the dbx4800 layout at the Empire Leicester Square and know this was the new word for cinema installation. I know there was no sure way I had £3K for each dbx4800 and was I depressed for weeks after hearing it in action with Transformers at 56KW!

After looking around Google I stumbled onto the DCX2496 and when I saw the price I know this would tackle some of the minor difficulties that I’ve faced over the years. Something that has most the problem solving under one lid.

It might have a few things less then the THX dbx4800 but it’s really for cinema the home doesn’t really need it unless you shamelessly rich.

A DEQ2496 is another thing on the shopping list the DCX2496 only has 9 band EQ per LF and HF when used for LCR fronts over its 1, 2, 3, 4, 5 and 6 outputs the more steeper crossover filters you use, the less and lesser the FREE SPACE because on the DCX2496 for dynamic EQ on inputs and all 6 outputs.

But when you weigh the cost of a few DCX2496 two is basic for LCR and another for surrounds and LFE.1 or surrounds and centre back.

Additional ones can be assigned for multiple surrounds and surrounds means lots placed along the walls to warp it around and defuse the sound without the THX being turned ON!

Mine has been turned OFF now for 4 or 5 months. The THX for the surrounds right adds this annoying hand-sawing like sound! That is noticeable with pink noise all-channels it sticks out like sore thumb!

I use 10 surrounds small JBL control 1, six for the sidewalls 3 on each side. 4 on the back wall because two isn’t enough I can hear the gap between the two.

Empire has at least I think 16 on the back wall? 11 for each side wall and each one is powered separately, I think, or that is what I have read, unless two or three are wired together and sent off to the Crown amp and so and so on.

Anyway I can ramble on for hours, a DCX and DEQ is cheap as biscuits when compared to £$3K.

I’d keep working on the graph a simple solution might just be eluding you?

Try standing the sub, on stool, first test it as is, then on a stool in the same area except it won’t be in the space anymore!?

3-D
Forwards backwards
Side-to-side
Up-and-down

[thewire]

Andysu wrote:

Afternoon Wire, Its chilly here in UK! We had mild snow fall this afternoon yippy!

I’d think hard if I was you. I was gutted when I saw the dbx4800 layout at the Empire Leicester Square and know this was the new word for cinema installation. I know there was no sure way I had £3K for each dbx4800 and was I depressed for weeks after hearing it in action with Transformers at 56KW!

After looking around Google I stumbled onto the DCX2496 and when I saw the price I know this would tackle some of the minor difficulties that I’ve faced over the years. Something that has most the problem solving under one lid.

It might have a few things less then the THX dbx4800 but it’s really for cinema the home doesn’t really need it unless you shamelessly rich.

A DEQ2496 is another thing on the shopping list the DCX2496 only has 9 band EQ per LF and HF when used for LCR fronts over its 1, 2, 3, 4, 5 and 6 outputs the more steeper crossover filters you use, the less and lesser the FREE SPACE because on the DCX2496 for dynamic EQ on inputs and all 6 outputs.

But when you weigh the cost of a few DCX2496 two is basic for LCR and another for surrounds and LFE.1 or surrounds and centre back.

Additional ones can be assigned for multiple surrounds and surrounds means lots placed along the walls to warp it around and defuse the sound without the THX being turned ON!

Mine has been turned OFF now for 4 or 5 months. The THX for the surrounds right adds this annoying hand-sawing like sound! That is noticeable with pink noise all-channels it sticks out like sore thumb!

I use 10 surrounds small JBL control 1, six for the sidewalls 3 on each side. 4 on the back wall because two isn’t enough I can hear the gap between the two.

Empire has at least I think 16 on the back wall? 11 for each side wall and each one is powered separately, I think, or that is what I have read, unless two or three are wired together and sent off to the Crown amp and so and so on.

Anyway I can ramble on for hours, a DCX and DEQ is cheap as biscuits when compared to £$3K.

I’d keep working on the graph a simple solution might just be eluding you?

Try standing the sub, on stool, first test it as is, then on a stool in the same area except it won’t be in the space anymore!?

3-D
Forwards backwards
Side-to-side
Up-and-down

I put all these holes in my stage now and the front left and right speakers now match seemless, but there is still the back wall I need to treat. There is the scene in Jurrasic Park right before Dennis is going to execute his virus on the computer, then they cut to the lawyer and the lightning strikes. That boom reverberates off my back wall like it is so easy to make my room sound bad, when in fact it sounds pretty good already. It doesn't sound like when I heard it at the theater I liked so much for that sound, and it is similar to problems I hear. So I want to fix the basics and get rid of the boominess in my room and then I will think about the eq more. When I get the eq wrong it just sounds worse than no eq at all, and setting up my current eq with the FBQ takes me a long time to enter in the two filters because I feel like I have to get it just right for all four subs and every seat.

[thewire]

Andysu wrote:

Afternoon Wire, Its chilly here in UK! We had mild snow fall this afternoon yippy!

I’d think hard if I was you. I was gutted when I saw the dbx4800 layout at the Empire Leicester Square and know this was the new word for cinema installation. I know there was no sure way I had £3K for each dbx4800 and was I depressed for weeks after hearing it in action with Transformers at 56KW!

After looking around Google I stumbled onto the DCX2496 and when I saw the price I know this would tackle some of the minor difficulties that I’ve faced over the years. Something that has most the problem solving under one lid.

It might have a few things less then the THX dbx4800 but it’s really for cinema the home doesn’t really need it unless you shamelessly rich.

A DEQ2496 is another thing on the shopping list the DCX2496 only has 9 band EQ per LF and HF when used for LCR fronts over its 1, 2, 3, 4, 5 and 6 outputs the more steeper crossover filters you use, the less and lesser the FREE SPACE because on the DCX2496 for dynamic EQ on inputs and all 6 outputs.

But when you weigh the cost of a few DCX2496 two is basic for LCR and another for surrounds and LFE.1 or surrounds and centre back.

Additional ones can be assigned for multiple surrounds and surrounds means lots placed along the walls to warp it around and defuse the sound without the THX being turned ON!

Mine has been turned OFF now for 4 or 5 months. The THX for the surrounds right adds this annoying hand-sawing like sound! That is noticeable with pink noise all-channels it sticks out like sore thumb!

I use 10 surrounds small JBL control 1, six for the sidewalls 3 on each side. 4 on the back wall because two isn’t enough I can hear the gap between the two.

Empire has at least I think 16 on the back wall? 11 for each side wall and each one is powered separately, I think, or that is what I have read, unless two or three are wired together and sent off to the Crown amp and so and so on.

Anyway I can ramble on for hours, a DCX and DEQ is cheap as biscuits when compared to £$3K.

I’d keep working on the graph a simple solution might just be eluding you?

Try standing the sub, on stool, first test it as is, then on a stool in the same area except it won’t be in the space anymore!?

3-D
Forwards backwards
Side-to-side
Up-and-down

The used equalizers are sure as not as cheap as they used to be. I spent awhile trying to find one, then gave up. I did find a cheap subsonic filter to try adding to the subwoofers.

http://store.hlabs.com/pk4/store.pl?view_product=12

Adding lots of acoustic treatments seems to have smoothed out (fixed???) some of the problems. The lower ports on the speakers had been eluding me.