Simplex 1x12 wedge combo version

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Askia
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Simplex 1x12 wedge combo version

#1 Post by Askia » Sun Mar 04, 2018 10:29 am

Hello Forum Members,
So I have started the project, and almost finished it. As I have a little time, I thought I'll share the process with some pics I did.
First, I managed to put together the main box, and cut some dampening, which came out fast, after testing if they fit fine...
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Then drilled out the handle holes, the L-pad hole, speakon input, and the place of the speakers
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Then tested the speakers, if they fit in nicely
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Then did the crossovers, and found a good place to fix, installed the L-Pad, and had a first test, if the speakers are working right... they did! :)
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So, the next step is glueing the front, glue the carpet, and get some speaker grill...

Sorry for the unorthodox picture orientation, if someone can tell me how to fix them here... the source's orientation is good.

Askia
Posts: 98
Joined: Mon Apr 25, 2011 12:48 am
Location: Hungary (Central-Europe)

Re: Simplex 1x12 wedge combo version

#2 Post by Askia » Wed Mar 28, 2018 5:55 am

Well, things went on... I've put the carpet on. It was my first carpeting experience, and the shape of the box made it quite difficult, so I'm not overly satisfied with the result.
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Askia
Posts: 98
Joined: Mon Apr 25, 2011 12:48 am
Location: Hungary (Central-Europe)

Re: Simplex 1x12 wedge combo version

#3 Post by Askia » Wed Mar 28, 2018 6:08 am

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I've cut the grill, installed speakers, and it's almost ready!

Almost, becouse I've to find out which speaker to go with. I've the BGH-25 tweeter, and two woofers to try. Delta Pro450a, and the 3012HO.
First was the Delta Pro450a. The result was not so pleasing, the tweeter was too loud for the woofer, but taming with L-Pad somehow made it not really less, but less harsh. Still there was an ugly sound, I guess somewhere arund 2khz, becouse that's a frequency where bass guitar just clanks unpleasantly.
Then tried the 3012HO, which made the sound far better, fuller lows, and the clanky sound went away. The tweeter is still louder then the woofer for me, and not sounding nice, rather harsh, not pleasant at all.
Notice: the woofers are brand new, so not braked in.
Ithink I'll have to make some measurments, if there's some problem with the crossover, becouse the tweeter really doesn't sound right for me.

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Bill Fitzmaurice
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Re: Simplex 1x12 wedge combo version

#4 Post by Bill Fitzmaurice » Wed Mar 28, 2018 7:09 am

The LPad may not be wired correctly. It should allow the tweeter volume to be reduced to fully off. If it's not wired correctly it might also affect the transfer function of the crossover, which might explain the harshness.

Askia
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Location: Hungary (Central-Europe)

Re: Simplex 1x12 wedge combo version

#5 Post by Askia » Wed Mar 28, 2018 11:29 am

Well, I can turn it off completely!
Anyway, I'll check the high pass filter, and the L-pad as well! Thank you!

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Bill Fitzmaurice
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Re: Simplex 1x12 wedge combo version

#6 Post by Bill Fitzmaurice » Wed Mar 28, 2018 12:30 pm

Also be aware that if there's distortion in the signal chain a tweeter will reveal it, and not in a nice way. If you like the sound with a tweeter keep it clean, no pedals, and have the amp gain low and volume high.

Askia
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Location: Hungary (Central-Europe)

Re: Simplex 1x12 wedge combo version

#7 Post by Askia » Thu Mar 29, 2018 4:22 am

Thanks for the advice! Luckily, I'm aware of this.

Askia
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Re: Simplex 1x12 wedge combo version

#8 Post by Askia » Sun Apr 08, 2018 7:39 am

There should be a problem with the low pass filter, the woofer is going up 'till 4 kHz! :) I'll check which element is doing the sabotage next week.

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Bill Fitzmaurice
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Re: Simplex 1x12 wedge combo version

#9 Post by Bill Fitzmaurice » Sun Apr 08, 2018 8:03 am

At what SPL? The 2nd order low pass isn't brickwall. If you want to make the cut off steeper add a 0.4mH coil after the 0.8mH coil, to create a 3rd order low pass. One end of the 0.4mH coil connects to the junction of the first coil and the cap, the other to the input of the LPad.

Askia
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Location: Hungary (Central-Europe)

Re: Simplex 1x12 wedge combo version

#10 Post by Askia » Sun Apr 08, 2018 11:06 am

I'll report after further investigation! Thank you for the advice!

Askia
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Re: Simplex 1x12 wedge combo version

#11 Post by Askia » Wed Apr 11, 2018 3:40 pm

Dear Bill,
the resistance of the additional 0.4mH coil should be less than: (here's the data in Ohm :) )

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Bill Fitzmaurice
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Re: Simplex 1x12 wedge combo version

#12 Post by Bill Fitzmaurice » Wed Apr 11, 2018 3:45 pm

If you use the same type as the 0.8mH you'll be OK.

Askia
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Re: Simplex 1x12 wedge combo version

#13 Post by Askia » Thu Apr 12, 2018 5:11 am

Thank you! :)
I have to confess, we made already an experiment... We put some reisser screws into the middle of the 0.8mH air core, until the inductance went up to approximately 1.2 mH. The sound become already much "better", the harsh high mids were chased away...
But I'll go and try the "T section" 3rd order low pass filter you advised!

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Bill Fitzmaurice
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Re: Simplex 1x12 wedge combo version

#14 Post by Bill Fitzmaurice » Thu Apr 12, 2018 7:00 am

Askia wrote:
Thu Apr 12, 2018 5:11 am
We put some reisser screws into the middle of the 0.8mH air core, until the inductance went up to approximately 1.2 mH. The sound become already much "better", the harsh high mids were chased away...
That's because you lowered the knee frequency. The problem is that it took away not only the high mids but also a lot of content well below that. Increasing the slope of the low pass should work better.

Chopthebass
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Re: Simplex 1x12 wedge combo version

#15 Post by Chopthebass » Thu Apr 12, 2018 11:24 am

Do the simplex tilt back plans include the opening for the amp or is this a modification you made?

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