2x6" headbox for a tweeterless 1x15"

[washburn_it]

Hi,

I've sold my "tweeterless" 1x15" to a friend of mine and, after some gigs, he came to the conclusion that more mid-high frequencies would "complete" the sound of the cab.
The cab is equipped with a B&C speaker (15PZ40, 4 ohm version) which T/S parameters are the following:

sensitivity (1W/1m)= 97 dB
frequency range= 35-2000 Hz
Pe (max)= 600 Watt RMS
Fs= 39 Hz
Re=5.4 ohm
Qes=0.27
Qms=7.6
Qts=0.26
Vas=137 dm3
Sd=855 cm2
XMax= +/- 8 mm
Mms=125 g
Bl=24.5
Le= 2 mH

He wouldn't like a 2x10" but something more compact so I thought about a smaller cab (than a 2x10") with 2x6" (in parallel to match 4 ohm), specifically two 18Sound 6ND410.
Would this be a good solution? Is a tweeter better than a midrange in this case?
To tell the truth I don't like tweeters with bass cabs, I prefer midranges but, anyway, I would like to have an opinion from the experts.

Regards,

Roberto

[billfitzmaurice]

Originally Posted by washburn_it

To tell the truth I don't like tweeters with bass cabs, I prefer midranges but, anyway, I would like to have an opinion from the experts.

Regards,

Roberto

IMO a midrange is almost always the better option, because no pro-sound woofer is capable of running to the 3.5kHz or higher where a tweeter kicks in, and almost no one needs to go higher than the 8kHz that a midrange driver can provide. A 2x6 would work well, make sure it's either a vertical array or a cross-firing horizontal array. With the low sensitivity of the B&C even one 6ND410 would suffice.

[Arjank]

Just add that 18sound 6" driver and build a fEarful.
One will do like billfitzmaurice said.

[washburn_it]

With the low sensitivity of the B&C even one 6ND410 would suffice.

As far as I know there isn't a 4 ohm version of the 6ND410 so I have to put two of them (8 ohm) in parallel, I could build a L-Pad to "equilibrate" the sensitivity vs the B&C.

Just add that 18sound 6" driver and build a fEarful.

My friend has just bought the 1x15" so I don't think he would agree to spend further money for a fEarful.

Thanks, regards.

Roberto

[Arjank]

Originally Posted by washburn_it

My friend has just bought the 1x15" so I don't think he would agree to spend further money for a fEarful.

If the 6" can be "added" to the current cabinet he only needs to spend some on the crossover.
It will not be an exact fEarful copy but if the B&C fit's in the current enclosure it could work out pretty well. The crossover might not be optimal for the B&C 15, but allways better then designing one without any knowledge.

[washburn_it]

Originally Posted by Arjank

If the 6" can be "added" to the current cabinet he only needs to spend some on the crossover.

Unfortunately there isn't enough room to fit the 6" directly in the existent cabinet so a compact external box is the only solution.
The "good news" is that his amp head has got 2 channels (with an electronic crossover) so there is no need for a passive crossover, he would drive the 1x15" with a channel and the "mid" external box with the other.
At the end of the game he would pay for the 6" and for the tolex to cover the box.

Regards,

Roberto

[mcapote]

Originally Posted by washburn_it

As far as I know there isn't a 4 ohm version of the 6ND410 so I have to put two of them (8 ohm) in parallel, I could build a L-Pad to "equilibrate" the sensitivity vs the B&C.



My friend has just bought the 1x15" so I don't think he would agree to spend further money for a fEarful.

Thanks, regards.

Roberto

why not just build the crossover to support a 4ohm woofer and 8 ohm mid? or am i off on that? cheaper than putting 2 expensive mids and lpading them down the 4dB or whatever you will have to to make up the difference.

[Arjank]

Originally Posted by washburn_it

Unfortunately there isn't enough room to fit the 6" directly in the existent cabinet so a compact external box is the only solution.
The "good news" is that his amp head has got 2 channels (with an electronic crossover) so there is no need for a passive crossover, he would drive the 1x15" with a channel and the "mid" external box with the other.
At the end of the game he would pay for the 6" and for the tolex to cover the box.

Regards,

Roberto

That sounds great, an external cab could be the ticket. Does the electronic crossover provide enough flexibilty/range?

[greenboy]

Yeah, what's the amp/preamp?

[washburn_it]

Originally Posted by greenboy

Yeah, what's the amp/preamp?

It's a Carvin R1000, the max crossover freq. is 800 Hz if I'm correct, so it shouldn't be a problem to cut the mid.

[Arjank]

Originally Posted by washburn_it

It's a Carvin R1000, the max crossover freq. is 800 Hz if I'm correct, so it shouldn't be a problem to cut the mid.

I see, it's sweapable and 12dB/oct. 12 o'clock would be a good starting point, I would stay between 10 and 13 o'clock. Just fiddle around with it. It may also be necessary to invert the 6" plus and minus to get a correct phase response.
For protection I would add a 47uf capacitor in series with the 6" mid, just in case you run the head fullrange and forget to switch the bi-amping on.

[Jeff Scott]

Originally Posted by Arjank

II would stay between 10 and 13 o'clock.

[Arjank]

Originally Posted by Jeff Scott

Hehehe, yeah, that looks funny for you guys.
But here in Europe we don't use AM an PM, so it was natural for me to write 13 instead of 1

So again.
I see, it's sweapable and 12dB/oct. 12 o'clock would be a good starting point, I would stay between 10 and 1 o'clock .

[lbwdog]

Originally Posted by Arjank

Hehehe, yeah, that looks funny for you guys.
But here in Europe we don't use AM an PM

So how do you know when it's time to go to work?

[Arjank]

Originally Posted by lbwdog

So how do you know when it's time to go to work?

Haha, remember, a day has 24hours

[Jeff Scott]

Not over here!

[Jeff Scott]

BTW, wouldn't that be read as 1300 hour or just 13?

[Matthijs]

Originally Posted by Jeff Scott

BTW, wouldn't that be read as 1300 hour or just 13?

I think 1300 hour is a US Army thing. To us it's just 13

[Arjank]

Originally Posted by Matthijs

I think 1300 hour is a US Army thing. To us it's just 13

To be more specific 13:00

[washburn_it]

It's 13 but here in Italy (at least) we use to say "it's ONE o'clock"...did we go a bit OT??