HiWave HiBM65C20F 3-1/2" BMR Wide Range Driver Measurements and Impressions - diyAudio
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Old 7th December 2012, 10:34 PM   #1
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Default HiWave HiBM65C20F 3-1/2" BMR Wide Range Driver Measurements and Impressions

I bought a few of the $7 US HiWave HiBM65C20F-8 BMR wide range drivers. At the price, I could not resist. Initial impression is that they sound good, and it's hard to tell if one is off or on axis as it sounds about the same wherever you stand.

Here is the test cabinet (1.6 liter and well stuffed):

Click the image to open in full size.

And, the measurement (close mic about 6", all other speakers, such as the subwoofer, are disabled for the measurement):

Click the image to open in full size.

Just using one for a center channel for now. I'll listen for a while (a month or two) and then put a real front baffle on (right now the baffle is 1/4" thick cardboard). I'm currently playing music through it (mono - ).

Last edited by Ben_Tech; 7th December 2012 at 10:37 PM.
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Old 7th December 2012, 10:40 PM   #2
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Can you say line array?


What do you think of that dip? Must be some phase issue.
There is a big spike in the impedance chart.
Can you post a raw measurement?
Maybe HD as well?
That would be splendid!
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Old 7th December 2012, 10:41 PM   #3
Pallas is offline Pallas  Pakistan
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Looks interesting for an up-firing omni-ish surround/ambience speaker.
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Old 7th December 2012, 10:46 PM   #4
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Quote:
Originally Posted by Pallas View Post
Looks interesting for an up-firing omni-ish surround/ambience speaker.
Yes! This to!

Try it out Ben!
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Old 7th December 2012, 10:51 PM   #5
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Yes, it sounds about the same pointing upward.
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Old 7th December 2012, 10:57 PM   #6
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I think there is not as much 'air' as some of the more expensive full range drivers (such as Fountek FR88EX, admittedly six times the price). Although I'm not sure too many people would be missing much above 12K anyway due to hearing issues. We shall see with higher levels and some break in. The HiWave has more bass than expected in a tiny sealed cab and will interface well with a subwoofer at 100 Hz. It's fast at all frequencies and upper bass is very tuneful....
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Old 7th December 2012, 11:03 PM   #7
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No smoothing, with phase:

Click the image to open in full size.

This is an in-room measurement and I have a lot of computers with fans running. The room has poor acoustics, but I did close mic it to help with that. Just thought you might want to know.
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Old 7th December 2012, 11:12 PM   #8
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Can u hear that dip? Somebody in another thread said they could but, it looks to be a pretty narrow BW to me.
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Old 8th December 2012, 12:03 AM   #9
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No way. I'd have to be incredibly familiar with a specific recording and there would have to be some important sonic detail right at that frequency. Then maybe a real human could pick out that that specific detail sounded 'muffled' or some such. I guess I just don't listen to specific tracks over and over like the professional reviewers do.
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Old 8th December 2012, 12:09 AM   #10
ra7 is offline ra7  United States
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Might be a reflection of the driver surround or the pipe edge.
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