woofer assested full range design wanted

[picowallspeaker]

Ok, so y'all, g'night !!!

 

[Cal Weldon]

Child of the universe is right. We need speakers capable of broadcasting to our distant neighbours. 6" doesn't get half way to the moon. We need real speakers to do a real job.

 

[tilroh]

Just purchased Bob B's MLTL plans. I can use them without woofers for a while.
In meantime I'm trolling through 100s of woofers at Wagner. Wagner Electronics
Don't know what to look for but I'm looking.

 

[tilroh]

I bought some 9mm “Acoustic Pin Board” (NCR rating 0.4) to line Bob Bs T7-A7IIs. I figure I’ll have to double it.

Tonight we visited a friend who said he’d build passive line-level crossovers for me. He ask me about crossover slope and decibels and other things that I had no idea about.

Then we listened to his new B&W 802Ds. I measured 95db on my phone and the speakers didn’t even sound loud.

Arrg, Mack

 

[chrisb]

As to the implied question about passive XO for the Alpairs - I'd try something around 80-100Hz for mono, and perhaps as high as 350Hz for stereo. First order has the fewest number of parts - if using the individual amp's input impedance in the calculus, a single cap for each HP and LP stage.

http://p10hifi.net/TLS/downloads/PLLXO_Calculator.xls.zip

Be aware that if you found 95dB not to be particularly loud (perhaps that was on peaks?) , you could be at risk of over-driving the Alpairs if your goal is to sustain higher levels than that.

 

[planet10]

First order has the fewest number of parts - if using the individual amp's input impedance in the calculus, a single cap for each HP and LP stage.

You still need a cap & an R for the low pass.The high pass can use the amp's input impedance as the R.

dave

 

[tilroh]

As to the implied question about passive XO for the Alpairs - I'd try something around 80-100Hz for mono, and perhaps as high as 350Hz for stereo. First order has the fewest number of parts - if using the individual amp's input impedance in the calculus, a single cap for each HP and LP stage.

http://p10hifi.net/TLS/downloads/PLLXO_Calculator.xls.zip

Be aware that if you found 95dB not to be particularly loud (perhaps that was on peaks?) , you could be at risk of over-driving the Alpairs if your goal is to sustain higher levels than that.

Thanks for XO info Chris & P10.

I should have used "harsh" instead of "loud". I guess it's one of the differences in having 8w/c and $100. drivers vs. 140w/c and high end speakers.

About 75db is my normal listening level.

 

[tilroh]

Made some sawdust today. Will glue up next Sat.

An externally hosted image should be here but it was not working when we last tested it.

 

[Cal Weldon]

If you had use cleats and have even just two clamps and an air nailer those babies would be fully assembled in an hour.

Just sayin'

Tough crowd here, we want to see progress.

 

[tilroh]

yeah and if a toad had wings......
Gotta find the hole cutting jig for the router and have a play with that first.
The sides are thick Meranti or "Philippine Mahogany". Finish will be Awlgrip's Awlwood satin.
How many types of Alpair 7 are there?!

 

[planet10]

How many types of Alpair 7 are there?!

4. The original. The same but with the molded insuper gasket added. The A7.3. Current is the same A7.3 with arrestor and instead of the molded in super gasket, a stick-on super gasket.

dave

 

[Octavia]

and don't forget there are the metal, paper, and maop versions too

 

[Octavia]

and of course the enabled dots, dashes and coating splashes!

 

[tilroh]

The B&W 802Ds `I heard the other night had dimples on the mid range driver as well as the bass port. 'Must be something to it.

 

[AudioLapDance]

True, and you can do many weird and wonderful things if you are willing and equipped to play with stacks of miniDSP brand products. I am not, so my choices are more limited.

Bob

If you have the cheap miniDSP you can feed it I2S directly but it has to be what the chip accepts: 48k/16.

 

[tilroh]

4. The original. The same but with the molded insuper gasket added. The A7.3. Current is the same A7.3 with arrestor and instead of the molded in super gasket, a stick-on super gasket.

dave

I chose Grey.

 

[planet10]

You mean Silver?

dave

 

[tilroh]

You mean Silver?

dave

Grey - Mark Audio Alpair 7 Gen. 3 - Grey - PAIR


A7G3 Grey

 

[planet10]

Mark calls them grey & gold but they are silver & copper. Makes things a bit confusing

dave

 

[tilroh]

Thanks P10. I was wondering if I was losing my mind, again.