Missed the fine print and could have easily wired wrongly with disastrous results 🫨 many thanks for pointing out 👍🙏
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Re: MA200/CHN50 combo WAW
For me, the plan going forward is based on some early results:
1. The MA200 produced big soundstage, better than other MA drivers. Also better than similar competitors products. Re: some (subjective)listening experience from @nandappe
2. There is some noticeable loss of treble with MA200 (in a TQWT box), based on the above tests
3. Distortion concerns at ~470Hz
https://www.hifi-selbstbau.de/index.php/hsb-datenblaetter/breitbandchassis/markaudio-ma200-m?start=5
For me, the plan going forward is based on some early results:
1. The MA200 produced big soundstage, better than other MA drivers. Also better than similar competitors products. Re: some (subjective)listening experience from @nandappe
2. There is some noticeable loss of treble with MA200 (in a TQWT box), based on the above tests
3. Distortion concerns at ~470Hz
https://www.hifi-selbstbau.de/index.php/hsb-datenblaetter/breitbandchassis/markaudio-ma200-m?start=5
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and possibly the MTM enclosure with dual MA200s will increase the SPL sufficiently?
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Depends what you call 'sufficient'. Parallel wiring a pair of identical drivers gives +6dB relative to a single example of the driver for a given voltage input: +3dB from the doubled cone area, and +3dB from the doubled current draw, since impedance has been halved. Series wiring = no change in sensitivity relative to a single unit: you get +3dB from the doubled cone area but this is cancelled out by -3dB from the doubled impedance (halved current draw).
As an aside, this is why driver SPLs should be measured under 2.83v conditions rather than 1w, since the actual SPL sensitivity results are comparable across different coil impedances.
I think I should stress that Dave & I aren't here touting for trade -we're here as DIYers. If you want to discuss it though, you can email us through www.planet10-hifi.com or www.wodendesign.comEnglish please
dave
diyAudio moderarion team
I meant the sound actually and these type of faults can be hard to troubleshoot especially when all boxed up. So the finger pointing easier on the drivers or cabinet design 😉haha!
RE: MTM, With the drivers close together, this will be like point source performance, very interesting 🤔
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It would -but would also require a complete redesign, with much larger components to lower the nominal crossover frequency, additional LF impedance compensation to kill the upper box impedance peak for the filter to actually work, and then extra EQ components to recreate the target response around the original filter frequency. A pure point source operation wasn't the object with this design; it's designed & voiced to incorporating the standard MTM target of decent horizontal dispersion with more in the way of vertical directionality / contrained polars.
800Hz -one of the favoured traditional Altec filter frequencies & works nicely with this configuration. However, remember the slopes are slightly asymmetric, and significantly offset, and to actually get the target response you need the padding & damping in place as they're serving as mild EQ (amongst other things).
Many thanks, really appreciate your time and efforts. Need to build these beauties at some stage but have limited skills/tools to build the cabinets according to specs. Someone with carpentry/joinery skills best suited. Doesn’t matter what region you are from but must have the skills and capacity to undertake. Happy to supply just the drivers needed and the filter boards for x2 speakers. Source the rest of the parts needed to complete. Then build to specs, test, measure, listen and compare. Share results. Builder to keep the finished items. Interested? Please let me know and we can start a new project here🙂
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Per previous (probably buried) answers, yes, providing you use some extra damping.
Low-mid-30s, optimally positioned / loaded, would be a realistic F6.
Low-mid-30s, optimally positioned / loaded, would be a realistic F6.
As I think my post in another thread suggests, with a rear mouth “horn” such as the FH family, boundary loading can make a huge difference in measured and perceived performance.
Finally got a pair of MA200's, Retro fit them into an old floor-stander 8" box while i build the correct boxes for them. So far they sound amazing, I'm sure they will need a while to "break in" but very impressive so far
