Hi, dont mean to thread jack you/ just wonted to post some pictures of my B741's i gor from pbn. I made a pair of sealed subwoofers to accompany them and the sound amazing together. The Subs are 32w4578t00 with dayton 2 cubic foot cabinets, and the 1000watt dayton amplifiers. I Added a top to bottem brace and dynomatted them. I also build a wood enclosure for the amp instead of the flimsy plastic ones they came with. The one thing i didnt like was the front baffle only has 4 bolts so i peminatly affixed them with glue and additional brackets from the back. I really like the B741 speakers they are very detailed but not harsh, very open sound stage, very life like especially with good quality vocal recordings. I was considering building them myself and i wrote peter a few email inquires for details and ended up just buying them from him. Im glad i did as i dont think my finish would have been as nice as yours. Im very impressed with the effort you put into them and how nice they came out.
Dear Dragon666, I really admire your work you did on B741. I have been keeping my eyes on this kit from Madisound for almost two years. I had a lot of conversations with Adam at Madisound, actually I have to be credited for the construction pictures posted on their site. I asked Adam if he could dig out few constractions details after we looked through original plans posted and he was able to dig that treasury out from somewhere. I'm curios where did you get construction details when you built yours and how you determined staffing and material for it to be used. This part I did not discuss with Adam yet. There are two reasons I have not built speakers yet, I'm finishing renovating my house and the second was that I was hesitant to built it because I was not sure if they will produce tight and deep Bass from 7" woofers. I read a review found on Web regarding these speakers and it was very favorable, but I have never spoken with some who actually built them. What is your experience with the overall sound quality? Would you considere the $3,500 paid for the kit worth of building them? I would appreciate it if you could share you experience with me.
Regarding the sound, there is enough base. But you need a very good power amp to get the most of these speakers. In my mind these speakers are flawless. Are they worth $3500? Definitely. If I needed another pair of these speakers I would drop another $3500 again without thinking.
Im thinking of getting the NAD M2 to drive these speakers.
Dear Dragon666, thank you very much for getting back to me. I really admire your engineering skills, both of us, Adam from Madisound and myself were not able to figure out that midrange compartment should be divided by angled braces, there is no way to see it on the drawing posted on the Madisound or Scanspeak sites, unless we just missed this somehow. Would you please let me know how you determined amount of stuffing and what material you used. Adam was not able to get me this information. This is might be the last piece of information I need before I proceed with construction. Did you consider building Ekta Grande by the way, it looks like a clone of B471 except of the Tweeter used: http://www.troelsgravesen.dk/ektagrande.htm.
Couple more questions, did you buy crossovers from Madisound or built them by yourself and would you consider using Baltic Burch plywood instead of MDF?
Again, thank you very much for your help on this.
Re midrange, I followed the instruction sheet from Madisound. Also emailed/telephoned Peter Norbaek and got confirmation. He was helpful.
Stuffing, I rang Peter Norbaek and he told me to stuff the hell out of the boxes. Egg foam and the rest wool/dacron. See my photos.
Bought crossovers from madisound. They are fiddly to install. I bit of a jigsaw puzzle to get around the driver and ports.
Got a great sounding result. Just do it.
Thank you. You are very kind.
I'm in Bathurst NB Canada. I retired last year as a Superior Court Justice; now, I enjoy building tube amps and have put together several large rear loaded horn speakers.
I'm almost decided to get the B741 from Madison. How do you like it ? I play mostly classical music, and light western vocals. Not much rock or heavy metal stuff. My wife is scarred that they are big rock music monsters...
here are my questions:
1. Those large cone shapped foam pieces....is that what goes in there ? Did you get that from Madisons?
2. I'm not keen on MDF but thinking of making the enclosure in baltic plywood, maybe doubling it up on the shell ? Unsure.
3. Do you place each crossover in each corresponding speaker space ?
4 How did you route those holes...I have 2 routers and a router table and I still can't comprehend how to do that. Do you use a template ??? one of those plastic jigs ???
anyway Mike, its nice to be able to touch base with you.....I may have questions as I progress. This is supposed to be a project for next fall.....but, knowing me, I may be anxious to start before
Firstly, these are the best speakers I have ever heard. It's a bonus that I had the pleasure of building them.
1. Egg foam that you can buy at most rubber specialists. I did not buy it from Madison's. Any one will do.
2. MDF has the best sound characteristics according to my research pre-buildiing.
3. Crossovers were placed as close to the drivers as possible, but they can actually go anywhere in the box. There is not a lot of room and so there is probably only 1 or 2 ways of fixing them in.
4. I used a router jig - yeah the plastic thing that you attach to your router and can buy at any hardware store. You will need to do a dummy run first to check the exact circle size and depths. I was able to get circles to 0.5 mm tolerances.