HSU Research Forum (HRF)  

Go Back   HSU Research Forum (HRF) > Hsu Central > Hsu Research - Speakers and Subwoofers
Forum Help Members List Calendar Search Today's Posts Mark Forums Read

Thread Tools Rate Thread Display Modes
Old November 16th, 2014, 9:13 PM
shadyJ shadyJ is offline
Registered User
Member Since: Feb 2009
Posts: 348
shadyJ is on a distinguished road
Hsu ever going to post CEA numbers for the MBM-12?

I am curious how loud the MBM-12 gets with respect to Hsu's other subs. Have you guys ever thought about posting CEA measurements for it? If not, Hsu Research ought to put something up which illustrates how much punch the MBM-12 can give? I know about Ilkkas measurements, but that was for the mk1 and can only be compared to the other subs Ilkka tested. Most of those subs are not around any more since those tests were done years ago, so it's a a bit difficult to gauge how powerful the MBM-12 is in comparison to current subs.
Reply With Quote
Old November 17th, 2014, 1:21 AM
SME SME is offline
Registered User
Member Since: Jul 2012
Posts: 258
SME is on a distinguished road
My understanding is that the only difference between the mk1 and mk2 is the ability to switch between ported and sealed modes. Please correct me if I'm wrong. I certainly wouldn't mind learning that my MBMs are more capable than I thought they were. That said, I looked at the old MBM web page, and it looks like it has the same amp, so they probably do perform about the same.

I'm running my MBMs in ported mode after having measured and compared the two. (Note: These were done in-room where the variation in location between woofer and port plays a bigger role so these numbers are rough estimates.) The ported mode boosts output up to 2-3 dB between about 30 and 200 Hz and shows no evidence of ringing or other substantial change in transient response. The port-contributed phase delay stays under 90 degrees above 30 Hz. I believe the built-in high-pass filters probably contributes a lot more phase delay (at least 180 degrees at 50 Hz, right?) in both modes. As such, I think the sealed mode is most useful for those without EQ capability who may achieve a better sub/MBM crossover with it.

Anyway, going by the Ilkkas measurements (don't forget to add 6 dB for the change in reference distance), it appears the MBM may perform slightly worse (~2 dB) than the VTF-15H. Hsu Research indicated otherwise in a phone conversation, saying the MBM should hold its own or exceed the performance of the 15H. I don't know if this statement assumes improvement gained in actual application by bi-amping the bass or by virtue of increased placement flexibility. Even if the MBM is more powerful than the 15H, I doubt it can beat either of the new products. I still think there's a niche for the MBM though. It costs a little more than 1/2 as much and takes up 1/3 of the space of a VTF-15H.

Last edited by SME : November 17th, 2014 at 11:48 PM. Reason: correct typos
Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is Off
HTML code is Off
Forum Jump

All times are GMT -8. The time now is 4:43 AM.

Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2022, Jelsoft Enterprises Ltd.
Forum Rules The Golden Rule: Treat others as you would want to be treated.

Technical Support: The best way to get tech support for serious issues is to call or email us. Questions asked on the forum may not be answered by qualified professionals.

No "Flaming": Spiteful talk and flaming wars will lead to "time-outs" for parties involved.

Shootouts: Shootouts are comparisons between products. We need to know about shootouts before allowing them on the forum, so call us and talk to the director of Sales before posting. Otherwise, your shootout may be removed.

Add to Reputation: Once you are a registered member, you can click this icon to add to the tally of other members' Rep Points. You must vote for seven other people before you can vote for the same person twice.

Report Bad Posts: Once you register, click this icon to let Administrators know if they should review a post. Please be specific as to why action might be needed.


Thanks for reading the rules. Have a good time :)

In Association With