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Old 20th July 2005, 04:31 PM   #1
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Default A fistful of Monacor SP-200X

I got an urge to build a crazy box with fullrange-drivers since I have never fiddled around with any. Since I work at Monacor, it's quite economical for me to use monacor drivers.

The project I had in mind was a big box with 6pcs of SP-200X (8inch fullrange speaker). When I simulate in winisd I get unusual (for "normal" drivers anyway) results. It seems I need a HUUUGE box to make them go low. Also I have a "bump" on the line which I would like to get rid of without a 680liter box (that size actually makes lovely similations). Is the "bump" just a simulation error or is this common for some fullrange speakers?

If a 600 liter box is what it takes then 600 liters it is, but I would like a smaller box if it's possible.
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Old 20th July 2005, 05:07 PM   #2
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I quickly modelled a maximally flat vented box with one SPH-200x driver in it.

83 liters is one big mother f... for ONE fullranger !!!
40Hz as F3 is jummy, but still ...

It seems your sims are correct, but may I suggest using SPH-60X ? I designed a vented enclosure of about 11 liters, with a F3 of 60Hz for a friend of mine. 60Hz is lower than you would expect for such a small driver, but you could get to 50Hz in a 25 liter enclosure, which *wouldn't* give you the "almost there but not just yet."-feeling about the bass.

There is a pic here:

The woofer in front is a SPH-212, which I will use in my Ambiorix sub (flat till 30Hz, vb 74L, total of 109L) in a few days.
The combination of those schould be very cost-effective.
-- If in doubt: overdesign!
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Old 20th July 2005, 05:27 PM   #3
giulio is offline giulio  United Kingdom
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something is likely to be very wrong with your simulations. I have used them open baffle with great satisfaction.

I doubt you need that kind of box.

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Old 20th July 2005, 06:31 PM   #4
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Thank you both for your ideas. I was leaning towards the 8 inch because of its much larger area. This speaker will have to provide a lot of SPL. I was planning to run the 6 speakers in series and then connect them to a 100V amplifier which is specified 100V @ 42Ohm. I know it's a totally braindead idea, but that's just the way I am
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Old 21st July 2005, 10:20 AM   #5
joensd is offline joensd  Germany
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A speaker with multiple 8" ?
Unless you roll 5 of them off at high frequencies I donŽt think youŽll get satisfactory results.
What about one driver as a start or a bi-pole transmission line?

Any comparisons of that especial driver with more "known" chassis?
Looks tempting as it is quite cheap.

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Old 21st July 2005, 03:53 PM   #6
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Excellent point. That totally slipped my mind. Hmmm... guess I will have to figure out something else. I was a nice idea though
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Old 29th July 2005, 09:15 PM   #7
Igla is offline Igla  Slovenia
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I've put my Monacors SP-200X in a 75 liter bass-reflex cabinets
(one driver per box) and they are doing just fine.I drive them with LM3875 gainclone and NON-OS TDA1543 DAC.Bass is low, fast and defined.

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Old 30th July 2005, 08:36 AM   #8
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I have ordered a pair of them for test. They will reside in a fairly large box of 80 liter tuned to about 40Hz. I have tried the best I can to model a suitable parallel noth filter and a Zobel circuit for it. I used the formulas found at carstereo.com It should be quite interesting since I have never heard a full-range single driver speaker.
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Old 30th July 2005, 06:18 PM   #9
sumacSK is offline sumacSK  Slovakia
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I also use this driver in 47 litre box tuned to 45 Hz and I'm very happy with it. Looking forward to your experiences. BTW this driver needs helper tweeter IMO (I use eminence APT80 crossed with 0.5uF )

Good luck Martin
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Old 10th August 2005, 12:52 PM   #10
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Finished the speakers yesterday. You are right about the tweeter. Too much moving mass for high dynamics.

First I tested them with just the zobel circuit. The sound was very "middy". This is of partly because they are not "played in" yet. They will sound better after a couple of hours.

Today I assembled the parallel notch filter. Now we're talkin'! Much better. Except the lack of extreme highs they are quite OK. Considering the cost, they are excellent. Maybe I should try the smaller 5" drivers too some day.
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