To support my floorstanding speakers, i have the idea to make a dual subwoofer in a tv/stereo cabinet. So both the subs on the outside and room in the middle for the receiver and mediabox.
There is room for 21W(max) X 24D(+/-) and 13~15H. Which would give me roughly about 60~70 liter a sub.
Already made a samplebox in Winisd and i think the driver i chosen is not a good fit.
MONACOR SPH-300TC - 12" Subwoofer
With a 65l ported box (1x20cm vent) and low/highpass filters (25< and 120>) the max SPL is at best -2dB ???
That doesn't seem well, does it?
ps: i added two images, in the second picture i compare this driver to a SB-Acoustic, which seems to perform much better. The third image show the max power for both. The Monacar acts really strange here....
There is room for 21W(max) X 24D(+/-) and 13~15H. Which would give me roughly about 60~70 liter a sub.
Already made a samplebox in Winisd and i think the driver i chosen is not a good fit.
MONACOR SPH-300TC - 12" Subwoofer
With a 65l ported box (1x20cm vent) and low/highpass filters (25< and 120>) the max SPL is at best -2dB ???
That doesn't seem well, does it?
ps: i added two images, in the second picture i compare this driver to a SB-Acoustic, which seems to perform much better. The third image show the max power for both. The Monacar acts really strange here....
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Oke, i tried another type from Monacar, the 250tc 10inch driver.
Meanwhile, i learned you need a linkwitz transform too boost these kind of woofers.
so here i have simulated this Monacar 250TC in a 65liter vented box, with a highpass at 16hz and a lowpass at 160hz and a linkwitz transform.
This looks much better, but am i on the right track here?
What type of filter to use for the highpass for example?
I used the linkwitz here. And the butterfly for the lowpass.
Meanwhile, i learned you need a linkwitz transform too boost these kind of woofers.
so here i have simulated this Monacar 250TC in a 65liter vented box, with a highpass at 16hz and a lowpass at 160hz and a linkwitz transform.
This looks much better, but am i on the right track here?
What type of filter to use for the highpass for example?
I used the linkwitz here. And the butterfly for the lowpass.
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The 300TC driver is a mid-bass driver not a subwoofer. The 250TC seems to be similar. They will run out of xmax quickly.
Are you sure you want stereo subwoofers? 90+% of all recorded bass content is mixed mono and will sound bad over a stereo bass system.
To have the least phasing and comb-filtering effect you want to have the subs together and in a corner of the room.
Keep in mind that if you are going to use it indoors, you will get a big boost on the low end due to room/boundary gain, which will make it sound boomy. (to much low end) A sealed subwoofer has a nice roll off that compensates for the room gain and will sound best.
Are you sure you want stereo subwoofers? 90+% of all recorded bass content is mixed mono and will sound bad over a stereo bass system.
To have the least phasing and comb-filtering effect you want to have the subs together and in a corner of the room.
Keep in mind that if you are going to use it indoors, you will get a big boost on the low end due to room/boundary gain, which will make it sound boomy. (to much low end) A sealed subwoofer has a nice roll off that compensates for the room gain and will sound best.
Well, i was not convinced with the Monicars i picked (just in simulation) so i looked futher and this is maybe the best option for me:
The S8 Acoustics SB23MFCL45-4 8 inch driver. This is really a subwoofer beast, with 12mm Xmax for example.
I do not want to place them in corners, the plan is i merge them into a tv/stereo cabinet. That does not mean the subs are gonna be stereo, the cabinet is just called that way, i never seen a tv/mono cabinet...haha.
What does concern me is resonance of the cabinet, so anything standing on it will "jump". Some slices rubber can help with that, i asume.
The plan is --sub(mono)----receiver/mediabox----sub(mono)--
On top the topplate wood, 2inches thick, with some dampening under it.
On the bottom, also dampening feets.
That is the plan. But i build one sub-box first, test it and i guess i still have to use some passive filtering to balance things out. Just adding the plate amp and fiddle with that, is as i asume, not enough.
So yes, i do have to measure things and measure again to get that smooth bass, from possibly not the best position. What is does, is saving me space. Thats what i am after.
No worries if things do not work out the way i like them.
ps: the boos of the low end is not lower Fs, but a bump at some higer Fs? Agreed, that is what the measuring is for; to balance things out, a paramedic EQ filter for example.
The S8 Acoustics SB23MFCL45-4 8 inch driver. This is really a subwoofer beast, with 12mm Xmax for example.
I do not want to place them in corners, the plan is i merge them into a tv/stereo cabinet. That does not mean the subs are gonna be stereo, the cabinet is just called that way, i never seen a tv/mono cabinet...haha.
What does concern me is resonance of the cabinet, so anything standing on it will "jump". Some slices rubber can help with that, i asume.
The plan is --sub(mono)----receiver/mediabox----sub(mono)--
On top the topplate wood, 2inches thick, with some dampening under it.
On the bottom, also dampening feets.
That is the plan. But i build one sub-box first, test it and i guess i still have to use some passive filtering to balance things out. Just adding the plate amp and fiddle with that, is as i asume, not enough.
So yes, i do have to measure things and measure again to get that smooth bass, from possibly not the best position. What is does, is saving me space. Thats what i am after.
No worries if things do not work out the way i like them.
ps: the boos of the low end is not lower Fs, but a bump at some higer Fs? Agreed, that is what the measuring is for; to balance things out, a paramedic EQ filter for example.
8'' SB23MFCL45-4 :: SB Acoustics
That is more suitable but will be happy in a small box and it's bass response is not very smooth.
Are you designing for looks or sound quality?
Do you have a drawing of this cabinet and are the subwoofers going to be part of it? As that is probably not a sound idea.
Room gain doesn't influence Fs but but will raise practical F3 response.
You can't fix/EQ bad placement of speakers and this part is often overlooked as there is not much money to be be made.
That is more suitable but will be happy in a small box and it's bass response is not very smooth.
Are you designing for looks or sound quality?
Do you have a drawing of this cabinet and are the subwoofers going to be part of it? As that is probably not a sound idea.
Room gain doesn't influence Fs but but will raise practical F3 response.
You can't fix/EQ bad placement of speakers and this part is often overlooked as there is not much money to be be made.
Small box is fine, leaves me more room for anything else in the cabinet 😉
With this driver 25 Liters volume is the perfect match. I already bought this
driver, awaiting its arival. Hear good things from it.
Dunno about the bass response, what i see in winisd after a low/high-pass, linkwitz transform and a EQ to soften a peak, looks fine to me.
This is the measured box tuned at 30fs: Subwoofer Box for S8 Acoustics SB23MFCL45-4 | Ported Box | Slot
I try to design for quality, but i very much like it designed, part of the cabinet i have in mind. Hopefully you are not gonna tell me that it is impossible.
Keep in mind i am not looking for party mode levels sound. Just more or less normal soundlevels. Also i start only with 1 box, test that on different locations
and if i really cannot get to sound good on the position i have in mind, i drop the whole tv/cabinet thing and make it cornered box as you suggest.
ps: here you can see the simulated measurements in Winisd: Subwoofer bouwen met een plate amp - forum.zelfbouwaudio.nl
With this driver 25 Liters volume is the perfect match. I already bought this
driver, awaiting its arival. Hear good things from it.
Dunno about the bass response, what i see in winisd after a low/high-pass, linkwitz transform and a EQ to soften a peak, looks fine to me.
This is the measured box tuned at 30fs: Subwoofer Box for S8 Acoustics SB23MFCL45-4 | Ported Box | Slot
I try to design for quality, but i very much like it designed, part of the cabinet i have in mind. Hopefully you are not gonna tell me that it is impossible.
Keep in mind i am not looking for party mode levels sound. Just more or less normal soundlevels. Also i start only with 1 box, test that on different locations
and if i really cannot get to sound good on the position i have in mind, i drop the whole tv/cabinet thing and make it cornered box as you suggest.
ps: here you can see the simulated measurements in Winisd: Subwoofer bouwen met een plate amp - forum.zelfbouwaudio.nl
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