soffit or not?

Hey Stuart, I did a first draft of the side view of the soffit principle. What do you think? Greets Nillis

Hey Guys, I read through this post once again and decided to change my speaker placement. why? Because I needed more space to build the soffit, my speaker angle was not perfect and the listening position wasn't perfect either. as Stuart pointed out before. So taking all his advice into acount I made a new front design. Also gives me the possibility to make an absorbive front. as you suggested I moved back the soffits, and while I was @ it I changed to 60 degree speaker angle. I have the oportunitie to do it correctly, so i'll take it. When anyone has the time take a look please. Also from the reflection calculator my first reflection reaches the listening position @ 20,2 ms is 3 ms later then before. http://amray.andymel.eu/ 41505649383330<settngs>BEAMTRC<spview>-58.54974084376772:0.28716651295451356:1.0000000000000029<sktchpd>3%$102:594,438:594,102:290,128:208,210:162,412:208,330:162,438:290,362:162,362:179.862852#0:1,0:2,3:2,3:4,5:6,5:7,7:1,4:6,8:9%)361.9865784163334:179.94369147771474%(269.445207:324.4770759999997% My only concern is my room ratio is no longer as suggested by L.W sepmeyer. How does this affect my room? Or does the benefit of my current listening position, speaker angle en good soffit build outweigh the room ratio.

As the image I posted above shows, there's a region between the near field and the critical distance, called the "free field", where things are nice and smooth. That's the best place to be.

from Stuart. How does one know if he is in the free field when still in the designing factor and taking all the before info into acount?? Thanks!

Ok trying to design a decent soffit, with the little knowledge i've gathered here. did little update on previous design, so if anyone can tell me if I'm going in the right direction / any feedback would be greatly appreciated. major change = Baffle connection point in front of speaker. eleminating air gap Rear wall spacing now as real life situation. +52cm from speaker back. thanks for your time guys! I'm trying here!

any feedback anyone? thanks!

I just wonder how you would calculate the sorbothne pads on the top. I know the weight of the monitor preloads the bottom ones. With no weight on the top ones they might not be doing much. Like just setting a spring on top of something. I'm still learning about sorbothne and I'm still calculating what I need for mine but that's my basicly my understanding so far. The soffit design looks pretty bitchen though.

JeromyReno wrote:

I just wonder how you would calculate the sorbothne pads on the top. I know the weight of the monitor preloads the bottom ones. With no weight on the top ones they might not be doing much. Like just setting a spring on top of something. I'm still learning about sorbothne and I'm still calculating what I need for mine but that's my basicly my understanding so far. The soffit design looks pretty bitchen though.

Hey I was just wondering the same thing, stuart pointed me in the direction of sorbothane pads. the reason I put them on top and on sides is just to completly decouple the speaker from the box and to keep it from moving within the box. The way I understand Stuarts design is: Create a box put a speaker in it and make shure it's completly decoupled from that box with sorbothane so it can't transmit any vibrations to the box or surrounding structure. But how to calculate the size of these I still don't know and was hoping Stuart could enlighten me and you. But as I understand it it's a proprietary design and he's not so eager to give away his secret's. Understandeble! So I'm also trying to figure things out and can't say that my design is a good one. I just don't know.

But how to calculate the size of these I still don't know and was hoping Stuart could enlighten me and you. But as I understand it it's a proprietary design and he's not so eager to give away his secret's. Understandeble!

:thu: It's actually taken me quite a few years (and a lot of hard work) to refine this design, and several of my customers have paid to have it optimized for their individual rooms... with pretty good results, so far! So since it's something that other people have paid for, it's not really ethical to just throw it out in public, for free. You are on the right general track, though.... :) The key (as you already know, so I'm not revealing any trade secretes here), is to get the deflection correct on each pad.... - Stuart -

Hey Stuart, When I'm in the construction phase I'll send you PM for your rating for the soffit design. I need it to be good/best as possible. So maybe we can work something out. Whill take a while still so.... If ok with you I'll send a final room measurement plan here and if you can confirm the measurement of soffit and speaker angle, I would be well on my way and gratefull untill then. Thanks!

I was just wondering where you guys got the program to calculate the pads. I didn't see it on their web sight. My monitors just came in!! I bought them from someone in Florida so it had a long delay while they where getting power and Internet back after the hurricane. But I'm back to designing and building. They are Adam a5x They are 11"tall x 6.5"wide x 8.5"deep - 14.6 lbs - the response is 50hz to 50khz If some has a link they could share to the program or has it handy and could plug in some numbers for me I would be in your debt. I'm going to measure out my a5x and make a Cad file of the hole to cut out so I can CNC cut a baffle for mine. Once I do I'll put them up for everyone else that might be useing them. I know a7x are popular and if anyone needs help with that just holler. I can draw them up and even CNC cut them.

Hey J, Go to sorbothane.com Go to custom solutions for engineers Download desig guide application. Open and crunch in your numbers. Octave of your a5x is 25hz natural frequentie.. This is your goal as i understand it. Goodluck! And i just might pm you one day for that cnc baffle design for a A7x.

I replied to your PM a couple of days ago: Not sure if you saw that? - Stuart -