MTH-30 (again!)
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URL: https://forum.speakerplans.com/forum_posts.asp?TID=44496
Printed Date: 19 April 2024 at 2:40am
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Topic: MTH-30 (again!)
Posted By: mikey bear
Subject: MTH-30 (again!)
Date Posted: 24 October 2010 at 12:07pm
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Finished the 1st of 4 cabs yesterday. Will knock up the other 3 this week. Very quick and easy build, i would have thought if a whole day was spent building then all 4 could be finished in good time. A good cabinet to try for anyone's first build, and a good introduction to building horns i think. Also good value for money... 4 cabs from 3 sheets of 15mm and under £80 per driver. First impressions after testing in the garage were positive, cab sounds good and goes low enough for most types of music. Although with a -3db point of 52hz it doesn't quite do justice to some of the heavier digidub/dubstep records. I'll add more when i've tested all 4 in a small venue soon and worked out some PEQ settings.   |
Replies:
Posted By: Saul
Date Posted: 24 October 2010 at 12:21pm
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i too heard one of these the other day and was pleasantly surprised. nice sounding bass, and quite accurate. they don't drop very low, but i reckon if you piled them up in a stack of 8 they would! great little things for the size of them!!
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Posted By: mikey bear
Date Posted: 24 October 2010 at 12:26pm
| i'm expecting my stack of 4 to be quite pokey. i'm not sure however on the theory of coupling and tapped horns ie if they even couple at all. if anyone can shed some light on that one i'd be most grateful. |
Posted By: S DeXter
Date Posted: 24 October 2010 at 12:32pm
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Nearly all cabs will couple due to the increase in radiation surface. ------------- Enjoy your self...... It's later than you think....... |
Posted By: GekoMusic94
Date Posted: 24 October 2010 at 12:52pm
Looks good ! What's the tops?
------------- https://soundcloud.com/dj-uber |
Posted By: mikey bear
Date Posted: 24 October 2010 at 12:57pm
| Turbosound TQ310 |
Posted By: Tony Wilkes
Date Posted: 24 October 2010 at 1:29pm
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They couple as in mutual radiation but I do not believe that you get any additional extension at low frequencies, at least not to the degree of RLH. Tony ------------- www.forteaudio.eu - BMS - db-Mark Processors - Lexon (SAE) |
Posted By: GekoMusic94
Date Posted: 24 October 2010 at 1:30pm
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1 sub is enough for 1 top?
------------- https://soundcloud.com/dj-uber |
Posted By: subbass
Date Posted: 24 October 2010 at 6:06pm
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1 MTH-30 to two 8" top for live work 2 MTH-30 to one 8" top for heavier bass my findings
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Posted By: rich_gale
Date Posted: 24 October 2010 at 6:15pm
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how high will this play before sounding grunty and harsh? lovely looking little cab ------------- REFLEX ALL THE WAY.... (however, im playing with horns again...) That ok Mister Valiant? :) |
Posted By: GekoMusic94
Date Posted: 24 October 2010 at 6:21pm
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I think my MTH-30 and my 2 8" tops ( http://www.fbt.it/ENG/PAE/PRODOTTI/SPEAKERS/JOLLY/Jolly-8r-a/ - http://www.fbt.it/ENG/PAE/PRODOTTI/SPEAKERS/JOLLY/Jolly-8r-a/ ) are perfect for dance music because the tops SPL is only 114 db... What do you think? ------------- https://soundcloud.com/dj-uber |
Posted By: subbass
Date Posted: 24 October 2010 at 6:21pm
| ~150hz in my experience. above / around there it starts to sound a bit off |
Posted By: mikey bear
Date Posted: 24 October 2010 at 6:22pm
| had it crossed at 100hz and it sounded fine. am yet to play around with settings |
Posted By: subbass
Date Posted: 24 October 2010 at 6:25pm
good match. i was using a 125db 8" top for comparison
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GekoMusic94 wrote:Posted By: GekoMusic94
Date Posted: 24 October 2010 at 6:30pm
125db + 8" = (me)    What tops are they???
------------- https://soundcloud.com/dj-uber |
Posted By: subbass
Date Posted: 24 October 2010 at 6:33pm
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just gonna add another note: the 12sb30s can take more than suggested in the sims (in my experience!). these happily take a 600w amp clipping like hell with a 48db 38hz highpass . do this at your own risk though.....tops: http://www.voidaudio.com/product_detail.asp?id=52 - http://www.voidaudio.com/product_detail.asp?id=52
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Posted By: GekoMusic94
Date Posted: 24 October 2010 at 6:35pm
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WOW! And what you think with RCF LF12G301?
------------- https://soundcloud.com/dj-uber |
Posted By: subbass
Date Posted: 24 October 2010 at 6:38pm
| no idea. luckily with these cabs you can see easily if it is exceeding Xmax .. and you can feel the magnet for temp |
Posted By: GekoMusic94
Date Posted: 29 October 2010 at 1:47pm
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Any update?
------------- https://soundcloud.com/dj-uber |
Posted By: mikey bear
Date Posted: 29 October 2010 at 3:38pm
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measured the cab using an ecm8000 and arta in my garden. the response is pretty close to the original hornresp sim. a little peq flattens it out nicely also. have pencilled in sunday as the day to build the other 3 cabs as my wife is away for the day  .not finalised any settings yet but it looks like they may be crossed at around 120 with some overlap. |
Posted By: GekoMusic94
Date Posted: 04 November 2010 at 3:24pm
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Update update update!!!
------------- https://soundcloud.com/dj-uber |
Posted By: mikey bear
Date Posted: 04 November 2010 at 8:05pm
| no updates yet i'm afraid. work has got in the way this week. everything is cut and routed though, ready for assembly when i get a chance. |
Posted By: mikey bear
Date Posted: 14 November 2010 at 6:39pm
managed to find the time to assemble a further 2 cabs this morning whilst my son had his nap... |
Posted By: GekoMusic94
Date Posted: 14 November 2010 at 6:48pm
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Wow! Good Job!
------------- https://soundcloud.com/dj-uber |
Posted By: patrickman123
Date Posted: 14 November 2010 at 11:45pm
very nice
     ------------- "Thats what she said" |
Posted By: mikey bear
Date Posted: 10 December 2010 at 12:09am
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spent about 4 hours playing with 3 cabs this evening. very clear, undistorted bass and high output. crossed into the rs220 at 120hz the mth30 holds its own very well and moves a lot of air when driven hard. only thing letting the cab down is its low end response, the absence of certain notes in a couple of songs was very noticeable. however, this really wasn't a problem with the majority of music played (ranging from dub/dubstep to jungle to soul to hip hop to rock). if anyone who owns some of these subs wants a cheap thrill i suggest playing fantasy by the xx at full beans. so all in all, grat cab in my opinion but i'll prob end up trying out the tham15 in the hope of lower extension.   |
Posted By: JDCutta
Date Posted: 10 December 2010 at 8:01am
| If you haven't seen it already, I'd look into Jbells (diyaudio.com) single sheet tapped horn design. 2 will be flat down to 40, can be build from a single sheet of 8x4 and was designed around the 3015lf which can be picked up for £130 maybe less. |
Posted By: mikey bear
Date Posted: 10 December 2010 at 10:23am
| thanks for that, will check it out. that sounds a lot more cost effective than the tham15 with b&c 15tbx100. |
Posted By: GekoMusic94
Date Posted: 10 December 2010 at 1:43pm
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Great build and song choice! My house is seriusly shaking with only 1 MTH-30!
------------- https://soundcloud.com/dj-uber |
Posted By: JDCutta
Date Posted: 10 December 2010 at 2:45pm
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Heres the thread mickey bear! let us no if you build some :) http://www.diyaudio.com/forums/subwoofers/170771-single-sheet-th-challenge-24.html
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Posted By: mikey bear
Date Posted: 10 December 2010 at 4:45pm
| thanks. will prob have a punt at them in the new year. |
Posted By: djscooby
Date Posted: 12 December 2010 at 4:42pm
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I'm thinking about having 8 of these built and gunna have 8 x10s where did you get the plans for the mth 30s could you let me have a copy please ------------- Well my wife has kicked me out saying it's over due to my obsession with speakers don't know watt I'm gonna do with no ohm to go to |
Posted By: Ryan94
Date Posted: 12 December 2010 at 4:56pm
| http://www.freespeakerplans.com/mth-30.html - http://www.freespeakerplans.com/mth-30.html |
Posted By: Ras_B
Date Posted: 04 January 2012 at 3:47pm
| What 12" driver are you using |
Posted By: Tonskulus
Date Posted: 09 December 2018 at 5:51pm
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Just finished my first one. Nice design indeed! Sounds better than my cubo15 extended (RCF L15P540) and might be louder too, but however cubo does a bit lower I think. Need to measure/compare them too. Anyway, I'm amazed how loud it is being just single 12"! Yes, I have hog scoops etc big horn stuff but this thing is just sooo fun to play with. But I did a stupid comparsion using cell phone spl meter. But it gives however some clueabout spl differences beetween reflex and mth-30, both having JBL 2206H: First mth, second reflex (60litres tuned to 55Hz) 100Hz: 71/71dB 90Hz: 68/67dB 80Hz: 72/69dB 70Hz: 74/66dB 65Hz: 73/67dB 60Hz: 72/67dB 55Hz: 68/62dB (MTH still 6dB louder) 50Hz: 62/57dB 45Hz: 56/53dB Impact 12" driver was used here, as it sounds pretty good in mth30! I did push it really hard and no problems what so ever, with Carlsbro pro 2000 amp (2000W/4ohm bridged). |
Posted By: mini-mad
Date Posted: 09 December 2018 at 8:47pm
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Mine used to bang away (as a single) in my bar most weekends quite happier using the PD driver. The lack of serious low end was the plus for me as the crowd preferred the fact it pounded instead of boomed! I'm sure 4x these with a pair of 8/10" tops would fill any small/medium hall with more then enough pounding bass to put a smile on ya face ...what driver are you using? ------------- If it sounds like a gorilla is trying to escape, turn it down. |
Posted By: Tonskulus
Date Posted: 10 December 2018 at 5:55am
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Comparsion beetween Cubo 15 extended (RCF L15P540) vs. MTH-30 (Impact 6712) Measured 10cm away from the mouth. Not so scientific tho, still cell phone spl meter was used here!  Now I need to find out which drivers to get for 4 x mth's. B&C 12PS100 seems like a good choice. |
Posted By: doller
Date Posted: 10 December 2018 at 11:27am
| I have 6 and I love them. With hard trance the puond it out. I am using an cheap chinese driver in mine. can feed a pair off a xti 4000 to clip and they have never broken. I have tryed very hard to break them. Really like marco's stuff. |
Posted By: doller
Date Posted: 10 December 2018 at 11:32am
 I made my first ones square to the plan. The next four I made like this. I really think that they sound better with the rounded corners. I made the box wider to compensate for the lost volume. |
Posted By: studio45
Date Posted: 10 December 2018 at 2:57pm
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That is a great idea I love it! I made a pair with extra 45 degree pieces in the corners - I didn't alter the width though, as conceptually the corners represent "bulges" in the horn path if you have no reflector there - so when you round them or put a reflector in place, you are actually making the horn path closer to the ideal linear expansion? I was guessing that Marc O left such details out to make the build easier. Not that it could be *much* easier! Anyway good to see many people appreciating these magic little bins. If you want a right laugh, try putting a (disposable) 50 watt guitar amp driver in one and see how much bass comes out... ------------- Studio45 - Repairs & Building Commotion Soundsystem -Mobile PA |
Posted By: doller
Date Posted: 11 December 2018 at 9:09am
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I felt the same way about the corners and I did do the same as you with the frst ones. That looks like alot of work but it isn't you only have one panel. instead of 4. It was quick and easy. less scews. that is a center brace in the middle to use as a former. I would love to hear 6 a side. In a block of 6 they do go surprisngly low. not sub but low enough. |
Posted By: Tonskulus
Date Posted: 12 December 2018 at 6:04am
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Measured JBL 2206H, really smooth response with this one. Very nice and tight sounding too, just not as loud around 50-60Hz as Impact 6712 car sub driver but much smoother and better control. -10dB point was around 46Hz. mth-30/2206 vs. Cubo15/l15p540.. not much difference except cubo drops lower. (did not make any max spl measurements tho..) |
Posted By: Tonskulus
Date Posted: 13 December 2018 at 4:13pm
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Finally got calibrated umik-1 + measuring software. So here are my first real world response tests. Mic placement: 15cm from mouth/cone and 10cm from the floor. As I did notice previously, 2206H indeed has amazingly smooth response there!  Cubo15 vs MTH-30 (mic in plane with mouth, 10cm from the floor). Top: cubo, bottom: mth30  Even tho cubo drops lower, I have to say mth-30 is better sounding overall and gives more punch for l psytrance/house music as example. At least with these drivers I have tested so far.. So MTH really shines where lower bass is not requred. Next thing to do, is going outside for some max SPL measurements at a distance. And ofcourse, directivity tests as they claim TH does have some "throw" compared to ported/reflex. Who knows.. let's see. |
Posted By: studio45
Date Posted: 13 December 2018 at 5:06pm
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I doubt you will find much in the way of directivity as the horn mouth really is too small for that at the frequencies involved. Maybe if you have a block of 4 it will be a little bit louder in the upper bass on-axis, compared to behind the stack. I do know they respond extremely well to corner placement. You get a full 6dB more output in the room. It is very noticeable compared to having them in the middle of the room, but in both cases the sound pressure is quite even everywhere, there's no directivity. ------------- Studio45 - Repairs & Building Commotion Soundsystem -Mobile PA |
Posted By: Tonskulus
Date Posted: 13 December 2018 at 5:14pm
I now, low freq directivity requires large radiating area - at least in theory. Maybe there is something else going on? Well I have two hog scoops and they DO have some "throw" in front of them when stacked together, at least in 50-80Hz range there is much more bass 20m in front of them compared to back side. When it comes to small tapped horns, there is just a myth that has to be busted :) |
Posted By: toastyghost
Date Posted: 14 December 2018 at 1:50am
Where did you take these measurements? How did you window them? You’re too close to the box to be honest to get trustworthy data especially for a horn. The acoustic centre is often several inches in front of the cabinet. Measure at 4m with 20v input and calculate back to 1m if you want to compare sensitivity. Do it outdoors with nearest boundaries a good 5m+ away at least and window the measurement to get it usable. The mic should also be as close to the floor as possible, at an angle pointing down. As it is, the data you have is likely ‘inside’ the box and adding in room modes too. As for directivity, a TH118 has a measured 4dB broadband front to back level difference so they are more directional than a reflex by nature. I guess this is part of the diffraction effect of the small mouth vs the large face. |