heart Simple Mid-Top SMT 212

10 years 6 months ago - 5 years 5 months ago #5467 by giveortake
Simple Mid-Top SMT 212 was created by giveortake
Use this thread to discuss the Simple Mid-top SM212 design posted here

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10 years 4 months ago #5754 by hansa
Replied by hansa on topic Simple Mid-Top SMT 212
Recomended Eigtheensound driver/horn?!?

What seems to be the officer, problem?

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10 years 4 months ago #5756 by chaudio
Replied by chaudio on topic Simple Mid-Top SMT 212
I recommend all the 18Sound horns! They're great!

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10 years 4 months ago #5758 by tony.a.s.s.
Replied by tony.a.s.s. on topic Simple Mid-Top SMT 212
What ever speakers are used, if it's passive, the success of box will largely depend on the balance brought about by a finely tuned x/o.
A 2x12 mid will probably suffer from phase cancellation in the upper frequencies of the 12's, and there's no easy cure.

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10 years 4 months ago #5759 by chaudio
Replied by chaudio on topic Simple Mid-Top SMT 212
Tony, do you ever do 2.5 way crossovers? I mean if you've got a dual midrange, roll off the bottom one lower than the one closer to the HF so that only one driver is covering the region where it crosses over to the HF? Since a lot of drivers having a rising response you might get a flatter response?

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10 years 4 months ago #5765 by tony.a.s.s.
Replied by tony.a.s.s. on topic Simple Mid-Top SMT 212
Chris, I've never done that, but just to clarify, I was referring to the upper part of the 2 X12 regarding phase issues. It's the upper part of the 12's that go out of phase with each other when they are close together.. You may well have realised this, but I wasn't sure.

Peace and goodwill to all speaker builders

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10 years 4 months ago #5766 by bitzo
Replied by bitzo on topic Simple Mid-Top SMT 212
so...to resolve the phase issue should be nice putting a panel between the 2 woofer to divide the horn mouth?

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10 years 4 months ago #5767 by tony.a.s.s.
Replied by tony.a.s.s. on topic Simple Mid-Top SMT 212
When I first looked at the drawing which was for about 10 seconds, I saw it as a straight baffle front loaded reflex job. It just goes to show what a plank I can be sometimes. So, I guess the division separating the speakers is the answer.
I have mentioned before, that there is a point between 2 speakers where coupling ceases to be obstructive and becomes productive, I always meant to attempt to draw a graph indicating where the crossover point might be. I think the difficult part is the fact that, although frequency doesn't alter, I believe the size of the speakers play a roll in the effect. This is because of the beaming effect, which happens when the length of the frequency being played reaches the piston diameter of the speaker, therefore, a 10" speaker will play much higher before beaming occurs compared to an 18"speaker where beaming would occur at a lower frequency
My point is, regarding the coupling effect, is that I believe it would happen at different frequencies according to what size speaker is used. Perhaps the answer is to calculate at what frequency a particular speaker will beam, calculate the length and make the dividing wedge slightly longer than the figure. Someone who knows more than me may have a better answer.

Peace and goodwill to all speaker builders

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10 years 2 months ago #5877 by bitzo
Replied by bitzo on topic Simple Mid-Top SMT 212
In your opinion, what type of driver works nice in this cab?
I've heard someone that use b&c pe32

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10 years 2 months ago #5930 by nickyburnell
Replied by nickyburnell on topic Simple Mid-Top SMT 212
Thinking of doing a half version of this, one driver. I'm never sure about flares that don't go inside the diameter of the driver though. Is there any point?

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