I am probably misreading, so apologies in advance.
A 12" driver for an horizontal home center is pretty large. The big problem is the center to center frequency of the woofers, more than the crossover frequency, but it might be OK.
With a 12" coax though you are approaching commercial theater dimensions, so why not make it a vertical, floor stander?
Also, consider make it self powered. A 3 channel Hypex plate amp will solve a lot of crossover problems.
A 12" driver for an horizontal home center is pretty large. The big problem is the center to center frequency of the woofers, more than the crossover frequency, but it might be OK.
With a 12" coax though you are approaching commercial theater dimensions, so why not make it a vertical, floor stander?
Also, consider make it self powered. A 3 channel Hypex plate amp will solve a lot of crossover problems.
Last edited:
There will be a LCR when finished
The vertical L&R I don't think there the problem,
Just the horizontal center
The vertical L&R I don't think there the problem,
Just the horizontal center
Overkill is an euphemism.
That said i've got nothing against headroom, quite the contrary.
120db? Do you plan to run them at this level or this is just theorical limit/capability of the system you plan?
Ok about the screen i was going to ask about it.
That said, i visited the city theater recently. For a room something like 20meter width x 16 meter depth and 8 meter height they have less membrane area than you plan and it's able to make your hears bleed in middle of room... ( they probably have more amp power though).
That said i've got nothing against headroom, quite the contrary.
120db? Do you plan to run them at this level or this is just theorical limit/capability of the system you plan?
Ok about the screen i was going to ask about it.
That said, i visited the city theater recently. For a room something like 20meter width x 16 meter depth and 8 meter height they have less membrane area than you plan and it's able to make your hears bleed in middle of room... ( they probably have more amp power though).
Last edited:
With a 12" coax the frequency is not critical at all - you can go down until the woofer or subwoofer takes over with no problem.
With a coax you don't have a horizontal center in the critical range. 😉 The proposed coax isn't really the right choice tough. I'd strongly prefer a coax with a horn in front of the cone, like the 12FHX76. That provides a much more even mid-high dispersion.
120db music yes,
Nor in the mlp but my basement os 700-800sqft open space,
So I turn it up often when I am doing laundry, cleaning that kinda thing,
Lol
I love head room
I.love dynamic range
In 2 channel I should be fun qith EMD music
Nor in the mlp but my basement os 700-800sqft open space,
So I turn it up often when I am doing laundry, cleaning that kinda thing,
Lol
I love head room
I.love dynamic range
In 2 channel I should be fun qith EMD music
I guess you need more than 120dB. You need to drown out the washing mashine, the dryer, vacuum AND your yelling wife at the same time, after all!
The 12" can easily go down to 80 Hz but even at 150 Hz the phase difference is so low, you cannot detect it at all. So no, you don't get a single advantage from it with such a coax. Your argument would be perfect on a non-coax though.
^ no we talk coax driver ( cx88), not a coax CD.
The only reason to put mtm horizontally is... pictures and because more drivers are 'better'. Unless you cross low enough and need a lot of low end pressure.
But to be blunt, the kind of loudspeaker planned are ( theorically) on par with Tannoy Dreadnough. I would study them and for which space/requirements they were developped...
Go active and forget passive with 1kw amp imho. Like Mark stated earlier.
If going coax CD+Horn then things are differents.
Given your requirements i would take a look at Mark100's threads and way of doing loudspeakers. 😁
The only reason to put mtm horizontally is... pictures and because more drivers are 'better'. Unless you cross low enough and need a lot of low end pressure.
But to be blunt, the kind of loudspeaker planned are ( theorically) on par with Tannoy Dreadnough. I would study them and for which space/requirements they were developped...
Go active and forget passive with 1kw amp imho. Like Mark stated earlier.
If going coax CD+Horn then things are differents.
Given your requirements i would take a look at Mark100's threads and way of doing loudspeakers. 😁
Last edited:
Anyway, it doesn't matter, if you want that, many members of the board are willing to help you and so am I. I will tell you if something is unreasonable from a technical stand point but it's undeniable double 15" do a pressure and impact that's sheer impressive and can only matched by a horn speaker. It doesn't matter if the maxspl is never needed, if that's your dream, go for it!
I have 4 - 24 subs
With 2 more on my list,
Yes I have a problem
The sealed 15s gives Me so many crossover points ,
For home theater
And
2 channel should be so fun
I understand active,
I think I want passive as of now ,
Is a 500hz crossover unreasonable?
Might not be perfect but
With 2 more on my list,
Yes I have a problem
The sealed 15s gives Me so many crossover points ,
For home theater
And
2 channel should be so fun
I understand active,
I think I want passive as of now ,
Is a 500hz crossover unreasonable?
Might not be perfect but
Well, I have 4 15" subs in a 16m³ room, so it's comparable to your space? I don't mind if you go big, I'm happy there's someone who can go all out! 😉
500Hz as a XO from the mid woofer to the sub or the coax cone to the CD? If it's the latter, that's not very reasonable.
500Hz as a XO from the mid woofer to the sub or the coax cone to the CD? If it's the latter, that's not very reasonable.
Hi everyone,
Sorry for drunk texting you all last night. I meant well. So maybe I was typing with the wrong assumptions. I understood:
Woofer - Coax - Woofer, with the 3 large drivers 12" wide, implying a minimum center to center distance of 2' for the woofers. I also understood the desired Woofer/Coax transition to be 400 Hz. I did a little trig this morning (always a dangerous thing) and calculated that for this arrangement, at 45 degrees horizontally one woofer would lag the other by about 1.4 feet, or ~ 17". Then I put that into XSim using ideal drivers and came up with the interference chart below:
So, based on my poor understanding of the OP's request, it seems if you want to have good horizontal dispersion in the woofers then you need to cross at closer to 100Hz instead of 400 Hz. Of course, the problem is made worse because I assumed exactly 12" diameter drivers and 12" centers. Probably a bad idea.
If this design is going to be used with subwoofers anyway, better to ensure your coax goes to 80-100Hz and leave the rest to the sub.
For clarity, this simulation simulates only 2 ideal woofers and does not take into account the coax, cabinet, crossover, etc.
Sorry for drunk texting you all last night. I meant well. So maybe I was typing with the wrong assumptions. I understood:
Woofer - Coax - Woofer, with the 3 large drivers 12" wide, implying a minimum center to center distance of 2' for the woofers. I also understood the desired Woofer/Coax transition to be 400 Hz. I did a little trig this morning (always a dangerous thing) and calculated that for this arrangement, at 45 degrees horizontally one woofer would lag the other by about 1.4 feet, or ~ 17". Then I put that into XSim using ideal drivers and came up with the interference chart below:
So, based on my poor understanding of the OP's request, it seems if you want to have good horizontal dispersion in the woofers then you need to cross at closer to 100Hz instead of 400 Hz. Of course, the problem is made worse because I assumed exactly 12" diameter drivers and 12" centers. Probably a bad idea.
If this design is going to be used with subwoofers anyway, better to ensure your coax goes to 80-100Hz and leave the rest to the sub.
For clarity, this simulation simulates only 2 ideal woofers and does not take into account the coax, cabinet, crossover, etc.