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post #1 of 19 Unread 01-29-2017, 06:55 PM - Thread Starter
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Maximus LXE Build

Been reading, lurking and asking questions for a few months now and finally bit the bullet a few weeks ago and bought a pair of Maximus LXEs from . When money comes in I'll build a center as well.

I bought MBM flat packs to save some time and got designs for the tops from Erich. Matt is going to be making circuit boards for the XOs.

Cutout of the top cabs:



Glued up:


Got some walnut felled from a tree at my Grandpas that I decided to use for the front baffle.


Used a Jasper jig and router to copy the front baffle.



Built a paint booth:


Did a seal coat using epoxy resin on the walnut baffles. Lookin good!


Used a 50/50 glue (Titebond II) mix. Applied 2 coats within a few hours. Let sit 24 hrs then sanded with orbital sander using 220 grit, then a 3rd coat, 24 hours then sanded with 400 grit.

The waveguides on top are an exact fit so I don't want to get a primer & paint buildup on them. Prepped for that and then primed (Rustoleum High Build Primer). Did an initial double coat, then dry block sanded with 400 grit. Then a triple coat, wet block sanded 400 then 600.


And that's where I'm at...will keep posting as the project progresses!
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Last edited by deomayama; 01-31-2017 at 10:29 AM.
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post #2 of 19 Unread 01-29-2017, 06:55 PM - Thread Starter
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Next I Wet sand the primer with 400, then 600. Did a double coat of Rustoleum Black Gloss Enamel. Waited overnight and did a 2nd double coat. Let that dry and then it was on to the finish. I chose to go with Envirotex Lite epoxy resin. That was a slow process. I heated up my office to 95 degrees. Used plastic w/ masking tape to wrap it as the epoxy drips over the edges. Then after it sits for 45 minutes I pulled the tape/plastic off so it didn't permanently adhere to the tape. Then it cured for at least 10 hours before it could be handled and a new side began.



Next I ran the necessary wires in between two sections of the top cabinet and hot glued the holes the wires ran though. I found a felt roll at Home Depot and used that under the XOs to prevent rattling.



I wanted the top removable and with the ability to swivel. I bought some 16 guage 1.5" sink pipes and cut them to 2". I then sanded (400 grit) and sprayed them (along with magnetic dots seen on the upper cab for looks) with Rustoleum Metallic Copper. I used a 1.5" dowel that I had to sand down for the insides. I also had to cut the banana plugs that go inside almost in half so there would be room for them and some extra wire. The backs 3 pipes were glued (CA glue) and screwed into the top cab before I epoxied that side. I then glued in another small section of dowel so the felt would have something to sit support it.


Then I made a 1" dowel with holes large enough for posts to go into. I attached that with CA glue to the top of the bottom cab. The plugs from the top cab plug in here and the front pipe swivels on that dowel.


The piping was inspired by kefref over at the DIYSG forum.

Matt designed the XO board and installed the parts on the first. I copied his work and found that the XO for the top cab on fit into 1 spot and even then I had to trim the extra plastic off of the tweeter mounting section of the waveguide. It fit with about 1/4" to spare!




I used recycled denim from HD to line the inside of the top and bottom cab. I was also concerned about the wires rattling around so I used some of the leftover felt roll on the loose wires by sewing the felt together. That made a tube which fit nicely over the 16 guage monoprice wire.



Installed the drivers & port then turned em on!

Eventually I will get around to adding some cloth for the drivers.

Here is the finished product:


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Last edited by deomayama; 02-14-2017 at 03:39 PM.
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post #3 of 19 Unread 01-29-2017, 06:55 PM - Thread Starter
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Reserved

Last edited by deomayama; 02-14-2017 at 03:58 PM.
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post #4 of 19 Unread 01-29-2017, 07:04 PM
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Looks awesome so far!
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post #5 of 19 Unread 02-14-2017, 03:59 PM - Thread Starter
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Now...how do they sound???

Amazing! Especially the fact that they sound incredible at any volume level. It's almost deceiving because I have trouble figuring out what volume they are at just by sound because they sound just as clear at every value.

The only issue I'm having is it feels like the 12s under-performing. Here's how my REW Sweep came out. I did it with a 3.5mm plug mic from Amazon in to my laptop so I figured it might be that but then did some manual points with an SPL and came up with the 2nd graph.




Then I took it outside (figuring maybe it was just poor room acoustics) and got a similar result, An increase from 50-75db over a 30-125hz range.

I had Matt build the boards and 1 of the XOs and I copied his work on the 2nd. Then I confirmed and his boards are correct for the wiring. All the wiring internally is right. I stapled Recycled denim on everything but the baffle, bracing, and XO.

I cut the port to 36hz. Perhaps my math there was wrong but I checked it 4 times and used Precision Ports online calculator to get the same result.

Maybe I need to add some poly since there is quite a bit of space in there? I'll take the 12 out and add a picture later but I'm afraid that in some places the staples made the denim too thin.

Also the whole speaker is powered by a Yamaha Receiver with 100w @ 2 channels 8ohm. Was reading about others powering the mbm by itself with inukes. Is that my problem?

Any thoughts???
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Last edited by deomayama; 02-14-2017 at 05:52 PM.
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post #6 of 19 Unread 02-14-2017, 05:55 PM
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Cabs look awesome!

Is it possible that you have your AVR set to having a sub?
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post #7 of 19 Unread 02-15-2017, 06:55 AM - Thread Starter
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Thanks! I think it's probably a bad receiver. I remember the 10" polk sub I used to have sounding much less punchy awhile back and it was hard to even get it to stay on. At the time I thought I was just going crazy.

Last night was reading and found some other users who had the same problem with their Yamaha. Regardless of sub or wiring it to the mains it wouldn't produce the bass like it should.

Almost as if the portion of the receiver that produces low frequency went out. There isn't a low pass option anywhere.

Im gonna lug these over to a friends and test on his receiver this morning.
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post #8 of 19 Unread 02-15-2017, 07:16 AM
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Man those look awesome. Great work. I'd try picking up another receiver to see if that helps. Or, borrow a friends. You could also got to your local BB and buy a receiver from them to see if it is the receiver giving you issus. If is it, great. Either keep the receiver you bought, or return it for one you do want, or just return it. Gotta love BB return policy.

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post #9 of 19 Unread 02-15-2017, 07:23 AM
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I have several Yamaha receivers, no issues with bass. If you have it configured to use a sub, without the sub on, there will be an HPF in effect, and if that's set to about 80Hz, that nicely explains exactly what you see in that sweep. Alternatively, there could be some placement issues causing a big null in bass around 50-70 Hz... I doubt the 12" driver itself is at fault though.
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post #10 of 19 Unread 02-15-2017, 11:12 AM
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Looking great! I am glad to see one these builds in the wild.
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post #11 of 19 Unread 02-15-2017, 11:25 AM
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Great job on the build. The wood baffle looks amazing.

Before hauling everything to somebody's house to test. Try doing a factory reset on your receiver. Then go into your speaker settings and set your main speakers to "Large". If you have the main speakers set to "Small" the receiver will cut the low frequency signal from going to your main speaker channels. With the main speakers set to "Large" the receiver will send full -range signal to the speakers.
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post #12 of 19 Unread 02-15-2017, 12:54 PM - Thread Starter
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Def. the receiver. Read a whole forum last night with a few others who had the same problem. The receiver is an entry level model, refurbished, from 5 years ago so I'm not surprised.

I took it over to a friends this morning and the bass kicked in as it should and the sweep looked great. I'll try to do a factory reset but def. had the settings all correct on the receiver. I had it running 2 channel large with sub off and toggled every other setting that could possibly effect bass even in the slightest with no results.

Hopefully a factory reset will fix it.

Last edited by deomayama; 02-15-2017 at 05:40 PM.
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post #13 of 19 Unread 02-16-2017, 12:17 PM - Thread Starter
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Looks like the reset fixed it!

Below is the graph at my friends (green) vs mine after resetting.

Not sure what the 47hz drop is all about, definitely audible when running the sweep. Still sounds much better as a whole than before though.

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post #14 of 19 Unread 02-17-2017, 08:27 AM
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At 47Hz placement and room modes have a huge impact on bass. I get some similar dips which I address by crossing to subs above that.
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Finally got the grill covers done.

Used 3/4" mdf and put a 45 degree edge on them. The 12" is recessed as the foam on the 12" driver extrudes from the front baffle by about 1/4". Used neo magnets that attached to the screw holes. Then wrapped in grill cloth. I put the magnets on the screw holes and then glued them with CA glue which ensured that the magnets were spaced correctly to actually hit the screws. Used the same CA glue and accelerator to put the grill cloth on also. I love that stuff, it's solid in 10 seconds and holds anything together!


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post #16 of 19 Unread 02-22-2017, 02:03 PM
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Really like the way these are coming together, those grills really add the finishing touch

I'm curious to hear about how they sound, now that you have the receiver issue resolved. These are on my short list of speakers to build for strictly 2 channel system.

By comparison, what speakers were you using prior to building these?
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Actually the receiver reverted back so the bass is still less than what I'd like. I had Pioneer Andrew Jones and a 10" Polk sub before so a massive difference obviously.

Added the Special 88 this week actually to improve on the center although i was very impressed by the phantom center that the Maximus created.
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Maximus LXE Build

Great job!!! I came really really close to an LXE build. I'm doing a scratch build with the Mag12 which I highly regard in my world. It's a phenomenal driver. Erich hit a home run with its specs. That being said, what kind of power are you feeding these guys? I'm trying to get my arms around how the Mag12 performs from 500watts up to max rated at 1000. It will challenge Xmax in modeling so I'm trying to get some real world results. If you haven't and have ability to sweep it at 500-1000watts (just the Mag12 not mid/hi) I'd be very appreciative.

Oh and love the grills and that gloss finish on the MBM, nice work.


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post #19 of 19 Unread Today, 09:07 PM - Thread Starter
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Quote:
Originally Posted by M88@FL450 View Post
Great job!!! I came really really close to an LXE build. I'm doing a scratch build with the Mag12 which I highly regard in my world. It's a phenomenal driver. Erich hit a home run with its specs. That being said, what kind of power are you feeding these guys? I'm trying to get my arms around how the Mag12 performs from 500watts up to max rated at 1000. It will challenge Xmax in modeling so I'm trying to get some real world results. If you haven't and have ability to sweep it at 500-1000watts (just the Mag12 not mid/hi) I'd be very appreciative.

Oh and love the grills and that gloss finish on the MBM, nice work.


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Hah I wish. Right now I'm bottlenecking with my receiver which can only push 85 watts per channel. Still these sound amazing. I think 500 to 1000 would make my ears bleed!


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