Jack 10 - First Build Advice Required

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Stylojon
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Joined: Wed Jan 03, 2018 4:39 pm

Jack 10 - First Build Advice Required

#1 Post by Stylojon » Tue Jan 09, 2018 3:40 pm

Hi All

I've built 4 x Tuba 24's in the past and have decided to build a pair of jack 10's for a neat, compact bass rig.

I'm currently putting my first one together and i'm enjoying it very muchly :D

BUT

The crossover side of things is doing my crust in...

I've read my plans time and time again, so thought id ask a little advice in the hope things will be clear.

I aim to couple two J10's to my 300W @ 4 ohm amp (GB Shuttle 3.0 currently used with an Ampeg 1x 15 + tweeter cab)

I will daisy chain the cabs together for a 4 ohm load.

I would like to go "woofer only" for the bottom cab and woofer plus 6 piezo element flat array for the top one.

Do I need anything crossover / filter wise inside the lower cab?

What do I need in the top cab?

I will begin with Beta 10's in both cabs until funds allow me to upgrade (I already have 4 betas in other cabs)

Any good UK sources for any crossover & filter parts would also be appreciated.

Thanks for reading and apologies for what is probably a common question

Jon

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Bill Fitzmaurice
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Re: Jack 10 - First Build Advice Required

#2 Post by Bill Fitzmaurice » Tue Jan 09, 2018 4:29 pm

Stylojon wrote:
Tue Jan 09, 2018 3:40 pm
I would like to go "woofer only" for the bottom cab and woofer plus 6 piezo element flat array for the top one.
Do I need anything crossover / filter wise inside the lower cab?
You should use the same low pass filter as that in the top cab, or their phase responses will be different.
What do I need in the top cab?
The low pass and high pass filters shown in the plans.
Any good UK sources for any crossover & filter parts would also be appreciated.
viewforum.php?f=14

Stylojon
Posts: 7
Joined: Wed Jan 03, 2018 4:39 pm

Re: Jack 10 - First Build Advice Required

#3 Post by Stylojon » Tue Jan 09, 2018 4:47 pm

Thank you

I may try without tweeters first and see if the sound suits my style

I'm not a very "toppy" bass player.

Looking forward to getting them finished

Cheers

Grant Bunter
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Location: Ilfracombe Queensland Australia
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Re: Jack 10 - First Build Advice Required

#4 Post by Grant Bunter » Tue Jan 09, 2018 4:56 pm

For your woofer J10:
Under the heading "Woofer Low Pass filter" my older plans discuss the use of the 2K Chebyshev filter,
A Chebyshev alignment low-pass filter on the woofer reduces impedance in the midrange to allow higher current flow, and therefore about 2dB higher sensitivity, at 2 kHz.
and goes on to say:
It’s optional when bi-amping and in woofer only bass cabs.
The reason it's optional in a bass cab is you can decide for yourself if you simply want to use your drivers natural response to dictate the sound you get from the cab.
That's fine if you were only going to build woofer only cabs, but since you're building both varieties, I would put the woofer filter in (As Bill has said above).

You might also consider the piezo switching option:
viewtopic.php?f=14&t=19211

So you can switch/dial in the amount of HF in your top cab...
Built:
DR 250: x 2 (melded array) with March 2012 plans.
T39's: 4 x 20" BP102 , 2 x 28" 3012lf.
WH8: x 3 with melded array.
Bunter's Audio and Lighting "like"s would be most appreciated...

Stylojon
Posts: 7
Joined: Wed Jan 03, 2018 4:39 pm

Re: Jack 10 - First Build Advice Required

#5 Post by Stylojon » Tue Jan 09, 2018 5:13 pm

thank you - appreciate your reply

i must confess i'm a bit lost on the component side of things

i'm having a dig around online to see what's available and more importantly what's correct for my build!

Cutting wood? No problems.... building filters? Yikes!

Guess we've all got to start somewhere

Thanks again

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Chris_Allen
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Joined: Wed Jul 11, 2007 2:43 pm
Location: Huddersfield, UK

Re: Jack 10 - First Build Advice Required

#6 Post by Chris_Allen » Tue Jan 09, 2018 6:50 pm

You can build filters using terminal blocks. It's secure, simple and no solder required. The terminal blocks screw straight into the plywood.

Take a look half way down this thread:

viewtopic.php?f=30&t=21814
Built:
6xDR200, 2xT39, 2xT48, 2xJack110, 1xOmni10.5, 1xAutotuba, 1xT18, 1xSLA Pro, 1xW8, 1xW10

Stylojon
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Joined: Wed Jan 03, 2018 4:39 pm

Re: Jack 10 - First Build Advice Required

#7 Post by Stylojon » Wed Jan 10, 2018 2:38 pm

Excellent

Thank you

Stylojon
Posts: 7
Joined: Wed Jan 03, 2018 4:39 pm

Re: Jack 10 - First Build Advice Required

#8 Post by Stylojon » Sun Jan 21, 2018 11:54 am

Finished my first jack 10 today

Woofer only bass guitar cabinet

Loaded with Eminence Beta 10 (I had one needing a home)

One word.... GOBSMACKED

I'm loving what I'm hearing. I guess that's all that matters eh?

Never expected that much grunt from such a small speaker and cabinet!

Now.... Best I get on with number two! 😁

Thanks Bill!

Stylojon
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Joined: Wed Jan 03, 2018 4:39 pm

Re: Jack 10 - First Build Advice Required

#9 Post by Stylojon » Sat Feb 24, 2018 5:25 am

Can I just ask....

I love my first jack 10 and I'm building my second.

One is just not quite cutting it at rehearsals, so I'm sure two will be ok.

But

I'm also wondering how much of an improvement a deltalite 2 2510 would be over the beta 10 (used as I already had them)

Anyone upgraded from the beta to the deltalite?

Thanks

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Bill Fitzmaurice
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Re: Jack 10 - First Build Advice Required

#10 Post by Bill Fitzmaurice » Sat Feb 24, 2018 9:02 am

The answer you seek is in paragraph 2 on the first page of your plans.

Stylojon
Posts: 7
Joined: Wed Jan 03, 2018 4:39 pm

Re: Jack 10 - First Build Advice Required

#11 Post by Stylojon » Mon Feb 26, 2018 7:32 am

So reduced weight and maybe a bit more bottom end with deltalites due to greater xmax?

I have the xmax for the Deltalite 2 2510 listed as 4.2mm whereas my plans state 4.8mm

Was just looking for opinions that anyone may have had who'd upgraded from the beta to the deltalite

Maybe 2 x J10's with betas will do the trick without the extra financial outlay

Experiment time

Cheers

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