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Re: Couple J12L questions on flatpack, assembly and driver breakin.

Posted: Sat May 01, 2021 8:22 am
by Bruce Weldy
Joeytiii wrote: Sat May 01, 2021 6:32 am Oh yeah..... just figured out a new way to breaking the driver by running a android tone generator app through my wireless stereo. I am trying to figure out how high to turn up volume to match the output recommendations of 8 to 10 volts?

Do I just eyeball it the woofer for 1/4 inch movement?
No, go get a voltmeter. It doesn't have to be expensive - I think I bought one for under $10 that I've used for years. Set the volume based on hitting 10 volts showing on the meter.

Re: Couple J12L questions on flatpack, assembly and driver breakin.

Posted: Sat May 01, 2021 8:54 am
by Joeytiii
Bruce Weldy wrote: Sat May 01, 2021 8:22 am
Joeytiii wrote: Sat May 01, 2021 6:32 am Oh yeah..... just figured out a new way to breaking the driver by running a android tone generator app through my wireless stereo. I am trying to figure out how high to turn up volume to match the output recommendations of 8 to 10 volts?

Do I just eyeball it the woofer for 1/4 inch movement?
No, go get a voltmeter. It doesn't have to be expensive - I think I bought one for under $10 that I've used for years. Set the volume based on hitting 10 volts showing on the meter.
Yeah I have a multi meter I can use for that.

Now why didn't I think of that????
:roll:

Re: Couple J12L questions on flatpack, assembly and driver breakin.

Posted: Sat May 01, 2021 9:01 am
by Joeytiii
So I am building this cab for bass guitar only and will not be using any high drivers. I have been reading up on building the Low Pass filter and am perplexed at how best to create the joints. I have worked soldering on pc boards and when I look at the plans, it appears to show eyelets at each end of a wooden board. These were not part of the Leland's Deluxe kit so I wonder if I can just solder the speaker wire to each end?

Curious how other builders have created their own filter boards. Pictures would be helpful if available.

thanks

Re: Couple J12L questions on flatpack, assembly and driver breakin.

Posted: Sat May 01, 2021 9:28 am
by Bruce Weldy
Joeytiii wrote: Sat May 01, 2021 9:01 am So I am building this cab for bass guitar only and will not be using any high drivers. I have been reading up on building the Low Pass filter and am perplexed at how best to create the joints. I have worked soldering on pc boards and when I look at the plans, it appears to show eyelets at each end of a wooden board. These were not part of the Leland's Deluxe kit so I wonder if I can just solder the speaker wire to each end?

Curious how other builders have created their own filter boards. Pictures would be helpful if available.

thanks
it doesn't have to be pretty. 1/4" plywood. Lay out the parts where they need to go. I then drill a little hole on each side of the component. Use zip ties through the holes to hold the pieces in place, use hot melt glue all around them to lock 'em in place and just solder the wires together. No need for an eyelet board. You can certainly use one if you want - but it's not necessary.

I'd post some pics, but my new computer doesn't have my pictures on it yet.

I'm sure someone can show you some. Or just go look at some build threads. I'm sure there are pics of my crossovers in my POWERED SLA build.

Re: Couple J12L questions on flatpack, assembly and driver breakin.

Posted: Sat May 01, 2021 10:22 am
by Bill Fitzmaurice
Joeytiii wrote: Sat May 01, 2021 9:01 am Curious how other builders have created their own filter boards. Pictures would be helpful if available.
They're in your plans, and in the Sketchup model.

Re: Couple J12L questions on flatpack, assembly and driver breakin.

Posted: Sat May 01, 2021 11:21 am
by Seth
You can do them per the plans (recommended) and you can also get creative... as long as the circuit is wired correctly (cough cough... not gonna say it :mrgreen: )
Here's what I did for my shorty 2x6 SLA Pro's, used both sides of ¼" ply on stand-offs
20200407_181114.jpg
20200407_181124.jpg



Here's what I did for my Wedgehorn 6 build, assembled on a popsicle stick
20201207_141544.jpg
20201207_131413.jpg



Here's Bruce's SLA crossover, which is almost exactly like the plans show
(Note to general reader: There's a slight wiring error in this photo, do not use as a circuit wiring reference)

Image

Re: Couple J12L questions on flatpack, assembly and driver breakin.

Posted: Sat May 01, 2021 11:28 am
by Bruce Weldy
Seth wrote: Sat May 01, 2021 11:21 am
Here's Bruce's SLA crossover, which is almost exactly like the plans show
(Note to general reader: There's a slight wiring error in this photo, do not use as a circuit wiring reference)

Image
Oh my gosh....that wiring error will haunt me for all my days......

Re: Couple J12L questions on flatpack, assembly and driver breakin.

Posted: Sat May 01, 2021 3:06 pm
by Joeytiii
Bruce Weldy wrote: Sat May 01, 2021 11:28 am
Seth wrote: Sat May 01, 2021 11:21 am
Here's Bruce's SLA crossover, which is almost exactly like the plans show
(Note to general reader: There's a slight wiring error in this photo, do not use as a circuit wiring reference)

Image
Oh my gosh....that wiring error will haunt me for all my days......
Mucho Gracias.... this helps alot!

Re: Couple J12L questions on flatpack, assembly and driver breakin.

Posted: Tue May 04, 2021 6:17 am
by Joeytiii
The capacitor Leland sent does not have any markings to indicate a particular flow s I am assuming it can be installed in either

Re: Couple J12L questions on flatpack, assembly and driver breakin.

Posted: Tue May 04, 2021 9:55 am
by Seth
Joeytiii wrote: Tue May 04, 2021 6:17 am The capacitor Leland sent does not have any markings to indicate a particular flow s I am assuming it can be installed in either
Correct, it is a non-polarized capacitor.

Re: Couple J12L questions on flatpack, assembly and driver breakin.

Posted: Tue May 04, 2021 2:48 pm
by tallevan
Why use a low pass filter at all?
If you are using only a woofer for electric bass I don't see why you would throw away what few highs it reproduces.

Perhaps it improves the response in the mids a bit?
If so, the cabinet has naturally strong mids anyway.

Having said that, I do have a low pass filter in a woofer-only Simplexx cabinet that I can switch in and out.
I switch it in when I pair it with another Simplexx cabinet with a tweeter and filter network.
When I use it by itself, I bypass the low pass filter.

Re: Couple J12L questions on flatpack, assembly and driver breakin.

Posted: Tue May 04, 2021 3:36 pm
by Bill Fitzmaurice
You do so to improve the upper mids. Where highs are concerned the dispersion is too narrow for them to be heard off-axis.