EEVblog #172 - The CWVblog

[Mechatrommer]

I call that Carpenter's Woodworking Video Blog. Dude! are you into acoustic and audio? a simple red thick curtain all over the wall can do the job! like in orchestra hall. wont you put blinking lightbulbs in there? or something? edit: and you wear eye google gluing the wood? thats nerdy dude! thats nerdy! and i suggest you get sound system with the middle big subwoofer, that can rock your heartbeat? better the latest tech 5 or 7:1 system.

[Russel]

[...] edit: and you wear eye google gluing the wood? thats nerdy dude! thats nerdy![...]

Wearing eye protection while applying glue is just plain smart.

Dave, I appreciate the effort that you go to in order to provide good quality audio, and your blog to show us one of the ways that you did so. Keep the video blogs coming!

[appletek]

I was so excited to see a little bit of pro audio creeping into the eevblog, but DIY acoustics! I could not believe it!! I am a young guy building a career as an EE specializing in pro audio. Specifically I do custom and repair work for recording studios, servicing all kinds of gear old and new. I really enjoy your work on eevblog and the amp hour, and am regularly listening while elbow deep in someone else's audio toys. My master work so far is a studio here in Brooklyn, NY that I, and the original owner built together. Take a look here: http://www.3eggstudios.com/ Anyway... back on topic. The Acoustisorb 3 material looks very interesting. Having always worked with mineral based fiber insulations (to achieve the necessary MTC ratings and low freq absorption) I am all too familiar with the hazards of these products. The itching!! The Tontine data sheets look very promising, so I will be looking for some bonded polyester manufacturers state side. You can absolutely hear a change in that room on the camera audio; In fact better than your large diaphragm condenser mic, because of the difference in distance, gain levels, and polar pattern. What I am really working towards is this: You can improve the performance of your panels even further with a few simple mods. One of the first things is to displace the panels or "traps" from the wall a few centimeters. You can do some math to calculate the distance to correspond with a particular room mode, however without a time-energy-frequency analysis of the room, that is a bit impractical. Around 4-5cm should be appropriate. With that in mind, the next mod would be to remove the rigid backing and replace it with either a perforated backing material, open back, or additional fabric. This is to allow absorption from both sides of the Acoustisorb 3 material, as well as allow the material to relax. With a semi-rigid fiber insulation compression will change the absorption coefficient and could negatively affect the materials performance. Take that last one with a grain of salt, as I said before, the polyester stuff is new to me. Anyway... congratulations of taking the most important (an most overlooked) step to creating/improving your home studio. Everybody just wants to buy toys, not build better rooms. Keep up the good work Dave!

-JR

[pablo]

you wear eye google gluing the wood? thats nerdy dude! thats nerdy!

ha ha ha

nice point. I see you pay a lot of attention into details.

[Mechatrommer]

nice point. I see you pay a lot of attention into details.

just a glance then i noticed. no need detailed attention if this is what you do regularly.

[DrGeoff]

Ethan Winer's site (www.realtraps.com) offers a lot of information about acoustic treatment and building your own traps. Corner traps are very important as too are traps above the mix position. Some diffusion on the wall the monitors face is often preferred than simply creating a completely dead room, like we had in the 1970's recording studios.

For acoustic insulation (as opposed to traps) I've had great success recently with Acoustica's 'Quietwave' product, sandwiched between two layers of plasterboard. The traps are then hung onto this. Also found that using a french cleat is a really neat way of hanging traps with some space between the wall and the trap.

[DrGeoff]

Dave, where did you get your Tontine insulation from? Looks interesting and I'd like to try some out in a room here.

[alexwhittemore]

and you wear eye google gluing the wood? thats nerdy dude! thats nerdy!

Too true, but hey, can't fault him for setting a good example, eh!? My Dean of Students will do the silliest stuff simply because "I do everything I want my students to do and nothing I don't want." Including not walking on the school's seal on campus in order to keep the superstition up.