Need good drivers for 'copper' speaker cabinet

[exurbia]

Well pano the Pilbara is the back of beyond, but at the moment we are enjoying superb weather. We have only had a couple of Hot!! days so far. Most of the time it has been in the low to mid 30's only four days over 40 degrees since spring began. Can't wait for Summer
If you make it over here you're always welcome for a barbie and a listen to the system of the week.
Then we'll send you to stay with some friends with a goldmine at Marble Bar. The mine is actually at Bamboo Creek, an absolutely beautiful place bang in the middle of some really harsh country.

Peter.

[jerome69]

Originally posted by kstlfido
Found these-

http://www.madisound.com/catalog/pro...oducts_id=1615

Seas 7" coaxial. Clear cone. Not 8" but close enough!

Any experience out there with these?

-Kent

Hi Kent,

A good driver, well made, should match well with your cabinet. Can work in 35L@35Hz and can go down 32Hz@-3dB. Have a clean sound, should have a rigid box. Note 35 Liters ~ 1.25 cubic feet, the port should be 3inch diameter and 10.3inch long

Used in the French Elipson sphere

you can find a crossover for this driver at Madisound, Crossover

and here an other design from Speaker builder


Have fun

[exurbia]

Woohoo, those Seleniums look good for the job and the el cheapo dollars, not really full range though.
The Seas are a "nice" driver for domestic mid-fi, not really much good for playing an outdoor venue. They tend to get rather hot when they're hammered
I've got a pair here with separated coils, and that was with 80 Watts of unclipped input (good party but)

[jerome69]

Ok a PA driver is needed Better choice for hard conditions. Coaxial SEAS for home ...

See here Eminence Beta-8CX 8" Coaxial Driver

Also add The tweeter

and the crossover @3.5kHz and a L-PAD for the tweeter.
or a crossover with L-PAD @3.5kHz

Keep your box, a little too large but don't worry.

[Pano]

A pro driver is going to stand a LOT more abuse than any hi-fi job, for sure. But it may be hard to get low bass out of the pro 8" in 1.25 feet.

Just remember when you model what the driver will do in that volume - a 100Hz peak will give you that classic boom-boom sound that so many cheap systems have. It's what most people like.
A peak at around 75Hz gives a much warmer sound (to my ear). You don't have to go down into the basement to get happy bass.

You probably know what already, just throwing it out there.


OK Peter, I'll stop by for some brews and the barbie when I finally make that looong drive from Peth to Broome. Some day......

[Pano]

I just had a quick look at the Beta 8CX modeled in unibox.
A sealed box is not the way to go - but...

In a ported box of 1.25' (35.5L) it could work very well.
Tune the port to 70Hz and you have a nice little peak at 75Hz.
Tune it to 90Hz and you get a "boom bump" of almost 6 dB at 95Hz.
Or tune it in between for whatever flavor you like the best. =)

Decent effiency, too. Like 94dB/W. That sure helps.

[infinia]

Originally posted by panomaniac
I just had a quick look at the Beta 8CX modeled in unibox.
A sealed box is not the way to go - but...

In a ported box of 1.25' (35.5L) it could work very well.
Tune the port to 70Hz and you have a nice little peak at 75Hz.
Tune it to 90Hz and you get a "boom bump" of almost 6 dB at 95Hz.
Or tune it in between for whatever flavor you like the best. =)

Decent effiency, too. Like 94dB/W. That sure helps.

Hi Pano
Could you be kind and post .gif of the response of this driver with 70Hz tuning.
With Xmax and the 3"x3" port what is the max SPL and power?

[infinia]

FYI I thought to put this $47 selenium out there before > Sort of more of Pro midbass for closed box, IB or OB tho. It's really eff. and rugged. Fs seems too high, but may give useful pseudo bass with harmonics by tuning for extra low EBS since Vas is less than 0.4 Cu Ft. But if some way you could shoehorn a ten incher then you really be in the business.

8in http://www.parts-express.com/pe/show...iewRand=757360

10in http://www.parts-express.com/pe/show...number=264-332

EDIT>possible tweeter for DIY horn
http://www.parts-express.com/pe/show...number=264-235

[Pano]

Well..... looks like you can't get real loud without hitting x-max in the low end. See graph below.

The graph is with a 9sq in port - 70Hz tuning.

But I'll bet in reality, you'll be just fine. Maybe you'll want a HP filter at line level.

[infinia]

Thanks Pano
looking at your plot... varify the Total Response is from 2 parts i.e. TR = driver + port
Xmax is a valid limit for the driver only, so 6~7dB more drive can be had.

Yea you are right about the HP filter. I think all these BR w/ high Fs low Xmax will have port unloading issues.