Tower of Power build with 893, MBM, Volt 6 - Page 2 - AVS Forum | Home Theater Discussions And Reviews
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post #31 of 100 Old 03-31-2016, 05:38 AM
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From what I recall from his thread, once he built the 893s as ported towers he was happy with the sound. @strakele curious if you made any additional progress on the build or if you have stopped to rethink due to the measurements?

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post #32 of 100 Old 03-31-2016, 11:47 AM - Thread Starter
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Quote:
Originally Posted by luisev View Post
From what I recall from his thread, once he built the 893s as ported towers he was happy with the sound. @strakele curious if you made any additional progress on the build or if you have stopped to rethink due to the measurements?
Right now I'm just waiting for the MBMs to arrive. The 893's are done more or less..need to build the midbass enclosure then test everything together prior to finishing.
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post #33 of 100 Old 03-31-2016, 09:38 PM - Thread Starter
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Quote:
Originally Posted by dorri732 View Post
That guy was listening to the midrange only, with the other drivers disconnected. Of course it will sound hollow and tinny that way.
I gathered he felt that way regardless of whether everything else was connected or not. I don't remember if there was any associated measurements though. Either way, mine don't sound horrible by any stretch. I'd just like to get that 400-500Hz range back in line with everything else.

FWIW, I measured one midrange by itself with no crossover. I forgot to turn off the EQ I had done, so it was with 4dB of 500Hz boost and like 4dB of 1000Hz cut, but with that applied, the curve had a hump at 500Hz rather than the dip present when running through the crossover. So that makes me think it's the crossover.

I'll go back and measure a raw midrange with no EQ and post that.
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post #34 of 100 Old 04-01-2016, 03:59 AM
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Quote:
Originally Posted by strakele View Post
Right now I'm just waiting for the MBMs to arrive. The 893's are done more or less..need to build the midbass enclosure then test everything together prior to finishing.

what are you planning to use for amplification and a crossover for the MBM ?
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post #35 of 100 Old 04-01-2016, 06:36 AM - Thread Starter
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An iNuke1000DSP. About to do a parts express order for that, some grill guides, and associated wiring.
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post #36 of 100 Old 04-07-2016, 05:15 AM
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Quote:
Originally Posted by strakele View Post
Right now I'm just waiting for the MBMs to arrive. The 893's are done more or less..need to build the midbass enclosure then test everything together prior to finishing.
Did you order the MBMs with the flat packs and single port or are you building your own enclosure and using the 2 port design?

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post #37 of 100 Old 04-07-2016, 06:59 AM - Thread Starter
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Quote:
Originally Posted by luisev View Post
Did you order the MBMs with the flat packs and single port or are you building your own enclosure and using the 2 port design?
Flat packs. When available, I can't turn down that CNC precision and grooves cut for perfect fitment and reinforcement. Just makes it so much nicer.

On that note, my PE and DIYSG orders both arrived yesterday. Christmas in April!



Wasted no time getting to work. No glue mock up of the pieces. Decided to build it in stages since I only have a few clamps big enough to be useful on this one.



All braces glued in:



Baffles glued and screwed together. I don't think I'm gonna use screws on the other one. My thought was they'd add clamping force and strength to the bond, but they can actually push the 2 boards apart slightly.



For the second one I drilled the mounting holes and added T nuts first, so when I glue those together, they won't be able to float around on the glue and should stay perfectly in place.

That's where I'm at as of last night.
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post #38 of 100 Old 04-07-2016, 10:16 AM
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Yea, those flat packs makes things easier. To the left of the iNuke, what are those?

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post #39 of 100 Old 04-07-2016, 10:53 AM - Thread Starter
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Few pairs of Fountek buyout mids for a small line array experiment my wife is doing, and a little 2.1 channel amplifier to power a pair of bookshelf speakers (Jamo surrounds that the Volts are replacing) and a little sub for sound in the shop.
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post #40 of 100 Old 04-07-2016, 12:34 PM
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Does the MBM flatpack only come with the 1 big port option vs the two ports ?
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post #41 of 100 Old 04-07-2016, 01:40 PM - Thread Starter
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Yup, just the single 4" port.
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post #42 of 100 Old 04-07-2016, 01:43 PM
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Quote:
Originally Posted by HFGuy View Post
Does the MBM flatpack only come with the 1 big port option vs the two ports ?
I believe it is limited to 1 big port. No option to get the dual port for the flat pack. http://www.diysoundgroup.com/mbm-12.html

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post #43 of 100 Old 04-10-2016, 03:03 PM - Thread Starter
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Mostly worked on the house this weekend, but made some progress on the MBMs too.

Here's some more pics of a bunch of clamps on MDF panels...






Since these will have the 50+ pounds of 893 sitting on top of them, I added a bit more support to the top and bottom pieces in the form of metal brackets:




Both baffles are done other than the T-nuts for the port screw holes - Lowe's is out of stock. The enclosure above is ready for its baffle, and the other just needs one more side. Once I have the T-nuts I can attach the baffles and mount everything up! New TV stand is here as well, and new TV will be here this coming week. I'm trying to have everything ready to watch a movie next weekend. The twin towers certainly won't be finished cosmetically, but I want to test everything together Friday evening.
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Last edited by strakele; 04-10-2016 at 03:12 PM.
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post #44 of 100 Old 04-10-2016, 03:35 PM
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Are you still planning to finish them as a single tower? I'm curious as to how you're going to attach them together.

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post #45 of 100 Old 04-10-2016, 03:41 PM - Thread Starter
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That is still the plan. I'm thinking metal brackets holding them together, then the brackets covered by angled pieces of wood to form the shape of the 3D model I posted. I'll try to work out a way to attach the angled pieces such that they're removable. That way, if I really need to transport them for some reason, I can separate them back into 2 separate enclosures pretty easily by removing the trim pieces and brackets.
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post #46 of 100 Old 04-11-2016, 01:21 PM
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I had/have a fairly significant drop in the 400-600Hz range as well as the peak in the 800-100Hz range in my 893s. I wonder if it's something inherent in the design or a sensitivity in the design that all of us are encountering.

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post #47 of 100 Old 04-11-2016, 08:58 PM - Thread Starter
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Since like 4 or 5 people have it, I'm thinking it's something inherent in the design. I've still been meaning to take and post the measurement of a midrange by itself without the crossover. I think the crossover is inducing the issue.

Anyway, first mock up of the full tower:



Pretty sweet.
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post #48 of 100 Old 04-12-2016, 06:59 AM
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Damn that is cool, i guess now i HAVE to get some MBM.
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post #49 of 100 Old 04-12-2016, 07:39 PM
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Sorry i haven't kept up with this thread. I see i posted earlier but have been distracted lately. The peak around 1khz is normal and not surprising to me. The dip at 500hz is not somethibg I'd expect though. If many people are finding this, i need to investigate. My measurements don't show this type of thing.
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post #50 of 100 Old 04-12-2016, 07:51 PM
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Refer here for anechoic measurements: https://www.avsforum.com/forum/401-di...l#post37144850

You can see the peak at 1khz. Its more noticeable in room than the peaks in the treble because the off axis measurements also bunch up right there. There's a slight recess at 500hz but nothing like what you've shown. Ill have a look at mine and fool around with it and try to see what's going on. If you don't mind, measure it sitting atop the mbm. It'll help decide where to cross it over.
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post #51 of 100 Old 04-13-2016, 05:06 AM
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Looks great, did you just line the MBM with foam?


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post #52 of 100 Old 04-13-2016, 05:29 AM
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Looks great, did you just line the MBM with foam?


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Looks empty.
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post #53 of 100 Old 04-13-2016, 07:10 AM
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Looks empty.


I would think it would need to be lined since it's ported correct?

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post #54 of 100 Old 04-13-2016, 07:27 AM
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It's just a mock up, when completed it will need stuffing.
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post #55 of 100 Old 04-13-2016, 03:22 PM - Thread Starter
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Quote:
Originally Posted by tuxedocivic View Post
Refer here for anechoic measurements: https://www.avsforum.com/forum/401-di...l#post37144850

You can see the peak at 1khz. Its more noticeable in room than the peaks in the treble because the off axis measurements also bunch up right there. There's a slight recess at 500hz but nothing like what you've shown. Ill have a look at mine and fool around with it and try to see what's going on. If you don't mind, measure it sitting atop the mbm. It'll help decide where to cross it over.
I'll try to get to this tonight. My new TV arrived damaged, so I can work on this instead.

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It's just a mock up, when completed it will need stuffing.
This. For that picture, the woofer and port were not even bolted in, nor is the baffle glued on. I just wanted to see what it would look like
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post #56 of 100 Old 04-13-2016, 06:18 PM - Thread Starter
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Quote:
Originally Posted by tuxedocivic View Post
If you don't mind, measure it sitting atop the mbm. It'll help decide where to cross it over.

893's on MBMs, no EQ. Left green, right blue. Later there will be a screen within a few inches of their inside edge which may make a little difference.




And here's the raw response of one of the midranges with no crossover. It's quite smooth in its bandwidth.


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post #57 of 100 Old 04-13-2016, 09:43 PM
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The dip doesn't look nearly as bad now. But the peak looks pretty bad... ill pull mine out and play with it this weekend and see if something could be causing that like some diffraction or something.
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post #58 of 100 Old 04-14-2016, 06:55 AM - Thread Starter
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So I'm thinking of starting with a 150Hz crossover between the 893 and MBM. And yeah the peak is quite large. Interesting that it's non-existent in the raw response of the midrange. What do you make of that?
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post #59 of 100 Old 04-14-2016, 07:53 AM
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Quote:
Originally Posted by strakele View Post
893 and MBM.
What is the height up to the middle of the compression driver with the 893 on top of the MBM?

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post #60 of 100 Old 04-14-2016, 07:55 AM - Thread Starter
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About 42 inches.
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