HiWave HiBM65C20F 3-1/2" BMR Wide Range Driver Measurements and Impressions - Page 4 - diyAudio
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Old 10th March 2013, 11:12 PM   #31
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Hi Derek, looks like you might've misinterpretted slightly - I'm gonna build a bipole, not a dipole.

The former has all the drivers wired in phase, but two facing backwards. You get force cancellation (as the drivers are moving in opposite directions), so the cabinet won't try to walk around.
Another useful effect of this set-up is that baffle step losses are compensated for: each driver effectively sees an infinite baffle, as the same waves are coming around from the other side of the cabinet.

The cabinet will be sealed for a first attempt.
I might look into the 3.5" Peerless passive radiators at a later time - tuning could be interesting with the ~0.6 Qts of the drivers I've ordered.

Dipole construction will have lots of cancellation: I think even 100Hz would be wildly optimistic.
I might give it a quick try during the construction of the cabinet, but would expect lots of eq would be needed, which would take its toll on battery life.


Last edited by chris661; 10th March 2013 at 11:16 PM.
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Old 25th July 2013, 02:29 PM   #32
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I am pondering doing an MTM with the l.5 inch drivers, however I am wondering if the tweeter is even necessary? Wiring the drivers in parallel would increase the sensitivity to 87 db, correct? I would need a BSC if running full range. Thoughts?
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Old 9th September 2013, 02:32 PM   #33
lithoc is offline lithoc  Malaysia
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Originally Posted by Ben_Tech View Post
I listened to a few TV shows on the HiWave center channel today and found that, even with the center set to +8 dB in the receiver, the dialog was low compared to the music emitting from my reference speakers. I upped it to the max (+10 dB) and will try again.

The intelligibility was good, just not loud enough relative to the mains (which are not particularly efficient mind you). Sounded recessed, for lack of a better word.

I'm sure a line array of the BMR's would fix that but I only bought three, not the required four for a series/parallel wiring scheme. No big deal, will see how it goes.

Also, if the BMR was used (even in singles) for the front three, that would probably work as well as then all three would have the same power requirements.

Even though it only takes an hour apiece to build these in temporary form I'm debating if it is worth further experimentation or not.

Regardless, it has to be one of the best $10 speakers out there.

I have few questions to ask

Did you test the speaker using only BMR driver for left + center + right ?

How does it loud enough for some action movies ?

BMR driver claims to have lesser "fall off level" compare with conventional cone type driver, do you notice the same? Try listen from far?
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