"Crossover Design for New Project"

GM · August 14th, 2010, 11:04 AM

Originally Posted by Earl K

- Here's a frequency response.......

Thanks! Wasn't aware they had an epay store or reproducing the 511E.

GM

**Panomaniac** · August 14th, 2010, 12:59 PM

Extra thick walls or bracing?

I'll have both, please! :waver:

**Altec Best** · August 14th, 2010, 03:36 PM

Originally Posted by GM

Thanks! Wasn't aware they had an epay store or reproducing the 511E.

GM

Yes they are modified B's with no damping on them,I suppose you can apply it after or they will do it for you I think.

**bfish** · August 14th, 2010, 04:33 PM

Originally Posted by Earl K

- Here's a frequency response graph of a GPA 288H on one of their 511E horns ( presently being sold on eBay ) .

<> cheers

As compared to the 9848 system plot with a 511E/288-8E;

The GPA plot finally sheds some light on the 511E low end, -5dB @ 400Hz (based on a "usable" BW of +/-5dB from 400-15kHz). Might sound better at 600 though, depending on the network.

Which leads us back to the original Q of "crossover design"...

**bfish** · August 14th, 2010, 05:05 PM

Originally Posted by Altec Best

...they are ... with no damping on them...

Comparing plots of 288Gs on PWTs and other horns, the hump/dip/hump from ~1k-1.4k on the undamped 511E plot appears to be an effect of the 511s fundamental "bell" mode. (the sustained tone you get when striking one in front of a mic...). Probably safe to assume that can be easily fixed.

**Altec Best** · August 14th, 2010, 06:09 PM

Originally Posted by bfish

Comparing plots of 288Gs on PWTs and other horns, the hump/dip/hump from ~1k-1.4k on the undamped 511E plot appears to be an effect of the 511s fundamental "bell" mode. (the sustained tone you get when striking one in front of a Mic...). Probably safe to assume that can be easily fixed.

Looking forward to measuring mine.Original pair of E's that is well damped and my 288 conversion G's. My mic and rest of equip.should be here by early next week.

**bfish** · August 14th, 2010, 06:43 PM

You're welcome, but GM deserves the credit. I was playing ring-around-the-rosie in order to drag you through the briar patch so you'd understand, as understanding is way better than taking what you're told for granted.

As it turned out though, I got more scratched up in those briars than you did, because now I'm left trying to understand that &^%$$#$ DI plot.

**Altec Best** · August 14th, 2010, 07:02 PM

Originally Posted by bfish

You're welcome, but GM deserves the credit.

I know and I can't Thank him enough.All you guys have been super helpful.Let me put it this way."I WOULDN'T EVEN CONSIDER TRYING THIS PROJECT" without the guidance of all the members that have helped me. :thankU:

**bfish** · August 14th, 2010, 07:48 PM

"It's all about the music"

C'mon now, really. If you meant that, you'd be listening to (or performing) live music instead of listening to speakers.

You can be honest here. It's really about listening to recorded music on a system you built yourself.

**Altec Best** · August 14th, 2010, 08:21 PM

Originally Posted by bfish

"It's all about the music"

You can be honest here. It's really about listening to recorded music on a system you built yourself.

That's the plan.But that doesn't mean a whole lot if it sounds like crap no matter who built it right !! The most important thing is that it sounds right to me. BTW I have No Problem listening to speakers, especially "Good Ones"