new DIYer, Modula RS180 MT's vs. UniCC and Dayton III's - diyAudio
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Old 19th December 2006, 09:30 PM   #1
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Default new DIYer, Modula RS180 MT's vs. UniCC and Dayton III's

okay,

I am getting ready to upgrade the audio portion of my home theatre. basically, after researching long and hard, looking at different budget speaker build options, I have come to a few different options.

The first is to use three TM speakers, The RS180 Modula MT's. this is a proven speaker, and I figure three of them (Left / Right / Center) all standing up right, however the center will have to sit a lower stand, below the screen (tweeter not at ear level) I can point it upwards a little if need be.

The second option is to use 2 dayon DIII's for the left and right, and then use a UniCC project speaker

Dayton DIII

UniCC center channel


here is my thoughts. I like the ability to play loud, and The system currently has a 10" JBL northridge subwoofer, that I am not happy with the performance, and will be upgrading to a 12 or 15" sonotube. I use the system primarily for movies / sporting events with friends, however do like to listen to music on it as well. It will be powered through either a Pioneer reciever or a Yamaha Reciever (I have both, both are Dolby digital / DTS, both put out 100w to seven channels) I am currently only using 5 channels. I plan to upgrade down the road to a full seven channels, but that will be as funds and time allow.


lastly, the room that these speakers are going in, is large, it's approx 14x22, and the speakers and Screen exist inside of a large closet with the doors removed. Will that cause a problem with acoustics? The speakers exist away from the rear wall, and the fronts of the speakers are flush with the front of the closet as is the screen) I can pull them out slightly further if needed. The rear walls are currently bare brick, and will be soon covered in fabric. The flooring is a tile, however eventually it will be carpet, and the rest of the room is either wood paneling or drywall (ie this is a very bright room accoustically)

so I guess to recap it's this way

which will be better, 3 modela MT's in a L-C-R config or a pair of Dayton DIII's and a UniCC, given my room conditions, primarily this is for HT, however some music. large room, high SPL preferred, No near field listening (given HT, everybody is at least 8' away from the speakers)

Thanks

lastly, I am a first time Speaker builder, I have built a few car subs with mixed results, I have basic hand tools (router, rotozip, circular saw, etc) I am a DIY carpenter, and have done lots of DIY stuff, just never built a speaker box. I had considered doing a set of DIY Dayton D8's however decided against it due to the box sizes.
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Old 19th December 2006, 11:30 PM   #2
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I'd go with the RS180 MT's. The DIII was pretty awsome, but the difference in quality to the newer Rs180's are amazing.
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Old 20th December 2006, 02:57 AM   #3
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the RS180 based MT is a great speaker, however will it do a good job to fill a room as large as mine with sound? I like a good solid volume.

THanks
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Old 20th December 2006, 03:23 AM   #4
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I think this really depends on your receiver- what models do you have? An MTM speaker tends to have a 4 ohm impedance, and your receiver might have a problem with that. Also, the MT will be able to handle reasonably high SPLs if your receiver has a "small" mode.

I have the Modula MT, and they're really excellent. If you especially like the idea of an MT, also check out this project: http://zaphaudio.com/BAMTM.html

I'd expect it to be somewhere between the Modula MT and the DIII in terms of sound quality, but much closer to the Modula MT.
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Old 20th December 2006, 12:35 PM   #5
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Hi,

I'd go with JCs suggestion of the BAMTM.

Three sealed version for easy integration with your (new) sub.

/sreten.
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Old 20th December 2006, 01:03 PM   #6
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Quote:
Originally posted by joe carrow
I think this really depends on your receiver- what models do you have? An MTM speaker tends to have a 4 ohm impedance, and your receiver might have a problem with that. Also, the MT will be able to handle reasonably high SPLs if your receiver has a "small" mode.

I have the Modula MT, and they're really excellent. If you especially like the idea of an MT, also check out this project: http://zaphaudio.com/BAMTM.html

I'd expect it to be somewhere between the Modula MT and the DIII in terms of sound quality, but much closer to the Modula MT.
Yes, my reciever has a small mode, the pioneer is brand new, it's a basic HT, seven channel 100w. It was highly rated as an entry model HT reciever. The Yamaha is an HTR-5760. I am currently using the yamaha upstairs to power my living room HT, which is a athena Micra-5 system. However, I am more then willing to switch the recivers and put the pioneer upstairs and the yammie downstairs. Both have small settings, and all the new HT modes.


as for the BAMTM, I have a looked over this speaker quite a bit, and considered it, especially in the ported version, however the problem is that I have read that an MTM have poor off-axis sound fields, and my room is large, and the way the furniture is setup, really everybody is slightly off axis. I don't have enough space to put the speaker standing up. I have read alot about the BAMTM, however several people have asked and nobody responded as to weather or not on it's side it would have a big off-axis problem.

Also, I have read that aluminum tweeters tend to have a bright sound, that combined with my large room, essentially void of any kind of resonable sound deflection, wouldn't that make it an even BRIGHTER sound in my enviroment?

also, what about the problem of putting speakers in a closet? Does anybody have any thoughts?
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Old 20th December 2006, 03:55 PM   #7
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well it looks like I will be matching these to a CS12 25-31 SVS tube subwoofer instead of a home built sonotube.

does that impact anything?
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Old 20th December 2006, 04:58 PM   #8
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Clear- it looks like you've done your homework! A few comments, I hope they help:

About the BAMTM on its side; you're right, it's probably not a good idea. Most MTMs have limited dispersion in their vertical axis. This can actually be a good thing in their normal orientation, because it can reduce the sound bounced from the floor and ceiling on its way to the listening position.

About that particular aluminum tweeter- it's quite nice, and in fact I have it in my Modula MT, but if you like a more laid back sound then I won't try to talk you into it. In my opinion, it just sounds realistic. Sometimes cymbals and distorted guitars do sound harsh with this tweeter, but I don't think it's any worse than the time I've spent watching and playing in rock and symphonic bands. When you smash some cymbals, the sound is supposed to be really in your face.

You can always add a little EQ. On my receiver, I turned the "treble" setting down one notch. Sure the hi-fi snobs might scoff, but it made the sound better for me.

About mounting in the closet- that could be a big problem. It can essentially set up a cavity resonance that will echo after sound has ceased, and it can screw up your frequency response curve. From your situation, it sounds lik you sound have a look at the "no baffle step" version of the Modula MT and Natalie Portman, and consider flush mounting the speakers.

If you really still need the closet unobstructed, just hang a lot of wool coats and camping equipment (sleeping bags!) on either side of the speakers to absorb sound.

About the sub- I don't think there will be any major functional difference between that and a DIY tube sub. Some would argue that you could get more for your money DIY, but it sounds like the choice is made.
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Old 20th December 2006, 07:06 PM   #9
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Quote:
Originally posted by joe carrow
Clear- it looks like you've done your homework! A few comments, I hope they help:

About the BAMTM on its side; you're right, it's probably not a good idea. Most MTMs have limited dispersion in their vertical axis. This can actually be a good thing in their normal orientation, because it can reduce the sound bounced from the floor and ceiling on its way to the listening position.

About that particular aluminum tweeter- it's quite nice, and in fact I have it in my Modula MT, but if you like a more laid back sound then I won't try to talk you into it. In my opinion, it just sounds realistic. Sometimes cymbals and distorted guitars do sound harsh with this tweeter, but I don't think it's any worse than the time I've spent watching and playing in rock and symphonic bands. When you smash some cymbals, the sound is supposed to be really in your face.

You can always add a little EQ. On my receiver, I turned the "treble" setting down one notch. Sure the hi-fi snobs might scoff, but it made the sound better for me.

About mounting in the closet- that could be a big problem. It can essentially set up a cavity resonance that will echo after sound has ceased, and it can screw up your frequency response curve. From your situation, it sounds lik you sound have a look at the "no baffle step" version of the Modula MT and Natalie Portman, and consider flush mounting the speakers.

If you really still need the closet unobstructed, just hang a lot of wool coats and camping equipment (sleeping bags!) on either side of the speakers to absorb sound.

About the sub- I don't think there will be any major functional difference between that and a DIY tube sub. Some would argue that you could get more for your money DIY, but it sounds like the choice is made.
thank you, I have researched these alot. as for the speaker placement, the closet is empty. I should probably take a picture, and will try to remember when i get home tonight to do that.

that is really a seperate issue, i am still unsure about which speakers to go with, the modela MT's or an MTM, The biggest reason I don't want the BAMTM is that I can't find a kit that would work as an appropriate center channel. I could use a Modela MT with a Matching Tweeter, but I am afraid that given the unmatched impediance I will not get a proper Timber match between the three speakers. I know that the modela's come VERY highly recommended, and given that each speaker would be the same, matching them would be cake walk. I am just nervous of the output potential, given my large room with such small speakers.

as for the subwoofer, I purchased the unpowered SVS sub on ebay for $227. It's used, but appeared in excellent condition, and when you figure the buidling time and materials, while I might get a bigger subwoofer, I probably won't get one much better then the SV 12", not for under $250 plus amp costs.
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Old 21st December 2006, 03:12 PM   #10
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I did some further reading of the thread over at HTguide about the modula MT's and they say they will probably have a max volume somewhere in the 90's, given the size of my room, I am nervous that it will not be loud enough, which has me looking back at the BAMTM, but I am still without any solid ideas for a center channel.

Jon has a MTM center channel based on the Modula MTM and I could use the Natalie P MTM's but that would add significantly to the price of my build (due to the fact that I would have to purchase an additional 3 RS180 drivers)
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