MHB-46 Measurements

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   Add like 5-6cm and see how much it ads. That bump at 53-4Hz tells me it can really be tuned lower.Also try putting some wadding inside. That can also help with the dip and make the box go lower.

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MarjanM Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 10 February 2005 Location: Macedonia Status: Offline Points: 7845	Post Options Post Reply Quote MarjanM Report Post Thanks(0) Quote Reply Posted: 10 July 2013 at 10:08pm
	Add like 5-6cm and see how much it ads. That bump at 53-4Hz tells me it can really be tuned lower. Also try putting some wadding inside. That can also help with the dip and make the box go lower.
	Marjan Milosevic MM-Acoustics www.mm-acoustics.com https://www.facebook.com/pages/MM-Acoustics/608901282527713

slaith Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 30 December 2010 Location: Sweden Status: Offline Points: 73	Post Options Post Reply Quote slaith Report Post Thanks(0) Quote Reply Posted: 11 July 2013 at 10:02am
	I did some simulations in antother program I have, just on the BR part. And around 5-6cm seems about right(ish), all theorethical of course. Measurements will tell later. I lost around 2dB in output from the port, but gained around 5Hz in response. This seem a fair tradeof I would think, since there is a peak that is a little higher than the horn response in the graph now. As I said will do some testing to see what can be gained or lost. I dont know how much adding dampening material will gain me, maybe 1-2Hz probably. Will test that to, it's easy enough. The forward wall of the chamber will do nicely for that. My guess is that the dampening material will make the box resonace and q get a little lower, making the response the same. But how will that impact on the performance of the horn part? Because that's is what's really the issue, that the horn itself is a little to short. I would think that lowering the tuning will widen the dip, even if it's not there when using two boxes? Maybe you can shine some light on the subject? Also checked where the excursion is lowest Wonder if a Q can be calculated from the bandwidth of that dip? Maybe an inverse and calculate it as a Q value of frequency? Will have to do some digging around that, since there is so little of the cone movement being used there. Some narrow EQ should work just fine. This is fun, seeing what modifications can be made to an existing design! All for the greater good (to quote the guys from the movie Hot Fuzz)

MR-FIZZLE-89 Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 03 February 2012 Location: Sutton Bridge Status: Offline Points: 76	Post Options Post Reply Quote MR-FIZZLE-89 Report Post Thanks(0) Quote Reply Posted: 11 July 2013 at 1:47pm
	Very very interested! I too had thought about modification of the port to lower the cut off Hopfully a little more could be gained with not too much compromise in SPL performance It's also great to see peoples opinions on these cabs as they didn't seem to be very talked about until now. I will be using the Void V-18 once I get round to building my cabs, I spoke with Marc-o over on the Hornplans site. He said that the driver will work, possibly a little more efficient than the N401. I think for a start I will build an MDF cab to have a play with

MarjanM Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 10 February 2005 Location: Macedonia Status: Offline Points: 7845	Post Options Post Reply Quote MarjanM Report Post Thanks(0) Quote Reply Posted: 11 July 2013 at 3:21pm
	V-18 will work but looking at the measured response i suspect it will have even less low end.
	Marjan Milosevic MM-Acoustics www.mm-acoustics.com https://www.facebook.com/pages/MM-Acoustics/608901282527713

MR-FIZZLE-89 Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 03 February 2012 Location: Sutton Bridge Status: Offline Points: 76	Post Options Post Reply Quote MR-FIZZLE-89 Report Post Thanks(0) Quote Reply Posted: 11 July 2013 at 3:52pm
	Ahhhh.. Marc-o didn't mention that. Marjan what would be your opinion on using this combination? they will be used for dance music, DnB,Hardtrance etc. If they will not work well together I will have to look at another design to be able to use the Void. I chose this design because I want something not too big, not too complex of a build, to hit 40Hz or lower with reasonable SPL indoors and out, horn loaded Also something different to the norm I.E 1850/186 horn etc which are common as muck (although I do love them ) Not asking for much I know

MarjanM Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 10 February 2005 Location: Macedonia Status: Offline Points: 7845	Post Options Post Reply Quote MarjanM Report Post Thanks(0) Quote Reply Posted: 11 July 2013 at 6:01pm
	V-18 is very similar to the PD1850, so is will be loud and hard hitting but not very musical. So that is the reason you dont find them in many box designs. They do their best work in long horns. Scoops or FLH is their world. Short horns not so much. Also, not too big and dropping 40Hz or lover is not helping much too. So if you already have the V18 and do dance music, build a WSX. People says the V-18 really shine in that box. It would work in scoops but that is not the right box for dance music. So tough call there.
	Marjan Milosevic MM-Acoustics www.mm-acoustics.com https://www.facebook.com/pages/MM-Acoustics/608901282527713

slaith Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 30 December 2010 Location: Sweden Status: Offline Points: 73	Post Options Post Reply Quote slaith Report Post Thanks(0) Quote Reply Posted: 11 July 2013 at 11:43pm
	Put down two layers of paint today, two more tomorrow then spatter in the afternoon. Then it's of on holiday for a couple of weeks, so you guys will have to be a little patient. I think I know how to make a good model for the extra length of tube. Have some good board i'll make something usefull out of. Unfortunately I have nothing to add in the driver diskussion, mainly because I haven't heard either of them. The scene for systems of the kind you guys have on the "Island" are a rare breed here. To bad though, I think alot of people would really like some change from the ordinary fodder that's playing in the clubs. I'll take the time to upload a picture of the port design I did, as per request. What would you guys prefer, that I put it in the first post or that you have to look through the pages? Take it easy fellas. Patrik (edit ...spelling) Edited by slaith - 11 July 2013 at 11:45pm

slaith Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 30 December 2010 Location: Sweden Status: Offline Points: 73	Post Options Post Reply Quote slaith Report Post Thanks(0) Quote Reply Posted: 12 July 2013 at 8:28am
	Did some thinking before I went to sleep last night and seemed to rememeber that marc.o recommends 24dB/oct butterworth instead of linkwitz-riley. Since butterworth sums at -3dB and linkwitz-riley at -6 that would probably make some difference. Perhaps not alot, but maybe there is a few Hz to be made in there somewhere, just a thought. Will try this when I get the chance. Will do some measurements without filters also. All in good time.

MR-FIZZLE-89 Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 03 February 2012 Location: Sutton Bridge Status: Offline Points: 76	Post Options Post Reply Quote MR-FIZZLE-89 Report Post Thanks(0) Quote Reply Posted: 25 August 2013 at 7:35pm
	Slaith. How have you been getting on with your MHB's? Any progression? I am now stuck deciding between MHB 46 or CBE 18 from Stipe. I want to be able to hit 40hz upto 120 hz in a 1 box solution ( not needing kick ) using Void V18 but the MHB is not looking like a likely contender with the void Is there any body that has actually used the Void in MHB that can report how they perform? Thanks Edited by MR-FIZZLE-89 - 25 August 2013 at 7:37pm

slaith Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 30 December 2010 Location: Sweden Status: Offline Points: 73	Post Options Post Reply Quote slaith Report Post Thanks(0) Quote Reply Posted: 26 August 2013 at 4:26pm
	Hey ....not really the summer has been slow on my part. But just the building part, my whole system is coming along nicely with mixer, gates and compressors bought. But the paint is done, and I have buddy who is making the new port to fasten on the front. Will give him the drawings tomorrow. Think I will get this done fairly soon. Though I whink that with just 1 box you will have a dipp in the response between the port and horn. With two side by side the dip will be less deep, but then again some adjustments can be done with EQ. Will check this to when I have reached the proper response from the port. I'm thinking of making the first port about 20cm and the cut 3-5cm each time, this will give me some good measurements to choose from. Will have to check if my impedance measurement jig is funktioning properly. So I can measure everything between cuts. Any requests from the audience? Patrik

DJ Maestro Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 11 September 2012 Location: Surname Status: Offline Points: 89	Post Options Post Reply Quote DJ Maestro Report Post Thanks(0) Quote Reply Posted: 12 September 2013 at 4:04pm
	Any updates on the MHB? Yesterday Mr. Marc O have simmed 2 drivers for me, the first one must have a 17cm port and the second one a 22cm port. And for the Xover settings he told me this HPF 33Hz butterworth 24dB/oct continuous level will be 134dB SPL, peak level (crest factor 6dB) will be 140dB So I think if you ask Marc about the porting for your drivers, he will tell you for sure. Mr. Slaith how the cab sounds? low end, punchy with/without low end. How is the throw outdoor? Or should it be better to go with folded horns or these are also good?

DJ Maestro Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 11 September 2012 Location: Surname Status: Offline Points: 89	Post Options Post Reply Quote DJ Maestro Report Post Thanks(0) Quote Reply Posted: 12 September 2013 at 4:19pm
	Mr. Fizzle, i have 4 CBX18 now loaded with 18LW2400 and the really rocks for me ..I crossed them at 120-140hz without kickbins..they gave a nice punch. Stacked 2*2 and driven with 1700w per channel at 4ohms you can feel the punch on your chest on 15- 20m(indoor and outdoor. Dont know how to measure with mics etc. Cons: the cabs are very heavy, one cab takes 2 plywood. I have some build pics but dont know how to load them here.