Monsoon planars

[adason]

[Moderation edit: This thread split from - https://www.diyaudio.com/community/threads/monsoon-speaker-parts.391848/ ]

Thanks woody for the monsoon planars. Since this is already in the right section, i will post the measurements data here.
Lets start with mh-700.

 

[adason]

This is fr response from 0 degree on axis and 10, 20, 30 and 40 degree of axis.
Then on axis with phase, looks ok.
And finally distortion.
MH-700 like other planars has rising response from ~250 Hz up, with hump at 7kHz. There is some resonance at the hump, even spike in distortion.

 

[adason]

I measured from the back too, one would assume the same. The holes on the back are a little larger and it looks a little better.

 

[adason]

For completion, waterfall and spectrogram.
Pretty clean, except that 7kHz hump.
I would use these from 500Hz to 5kHz.
Do not pay attention to low fr bumps. That's my heating, its cold.

 

[adason]

Offcourse i used protective cap for measurements. 200uF for mh-700, and 30uF for the tweeter. Here is family portrait.

 

[adason]

And now for the tweeter.
Same stuff.

 

[adason]

To complete tweeter waterfall and spectrogram.
I don't think i will measure it from the back, its very symmetrical.

 

[adason]

This is what Monsoon produced as floorstanding speakers. For inspiration.

 

[AVWERK]

I remember the tall versions at CES in Vegas but they were being played out on the main noisy floor area
and refreshingly clean and nice sounding despite those conditions
It would be interesting to hear how they stack up now

regards
David

 

[planet10]

Thanx for that Adason, about what expected for the big panel, i am surprised the tweeters go as low as they do.

dave

 

[adason]

Actually, Monsoon used natural rollof of that tweeter to cross it at 1500 Hz. I would cross higher.

 

[planet10]

I should have some the XOs from the tweeter, IIRC 2nd order.

dave

 

[adason]

Started the build.
Off course foam core 🙂. But it will be braced by wood and lots of gorilla glue. Strong, stiff but light. And I got some more mh-500 from ebay.

 

[adason]

Main reason for two tweeters is impedance, I do not like 4 ohm speakers. Now its all 8 ohm.
All glued together. Now to the crossover. I am thinking 5kHz. Mainly because I want to suppress that 7kHz bump on mid, plus it will relieve tweeter from overexcursion. It may be capable 1.5kHz, but why push it.

 

[adason]

It will receive few coats of black paint.

 

[planet10]

Silver 700 panels… i have only ever seen them in black.

dave

 

[dBel84]

fun watching what you have come up with.

I popped my M1000 panels on top of a tangband long throw 5" subwoofer



they make great desk speakers / nearfield monitors

 

[adason]

Hi dBel84, have you measured fr response of those mh1000s? Just curious.

 

[dBel84]

Sadly not. I did buy a mic but have not tried measuring these yet.

 

[adason]

Started working on the crossover. Just 4uF for the tweeters, and 0.25mH for mid planars. 5kHz first order. Thats what i normally prefer if drivers behave. I try flat response and phase.
Measured response when tweeter and mid were wired in the same polarity (blue) and oposite polarity (brown).
Cleary cap is swithing in first order, tweeter needs to be flipped.