Thanks for the advice anyway. I looked on the internet but didn't find the absorbtion degree of OSB. In the book I have they have a table where you can see how much frequency is absorbed by for example a bass trap with a depth of let's say 60cm. This way you can find the right absorbers for your roo...

Yep, that's probably true if you build it just like in Alcatraz. But I'm unfortunately far away from duplicating this set up in our studio since I don't have enough space. I just thought of hanging up two or three big OXB boards (instead of bass traps) at the back wall and put a light cloth in front...

Thanks for the answer.But this way I can't really say how much frequency I'm about to absorb. For example if you use too much dampening material on the front (let's say having membranes all around your room) I could get in trouble loosing too much HF, right? You could measure it but I don't have acc...

I'm about to install absorbers into our new studios naked control room and came across the info on membrane absorbers (http://www.electricalaudio.com/StudioA/membrane.php) used in Alcatratz and Control Room A. I'm looking for an alternative to traditional bass traps. Are these really just OSB boards...

I wanna build a QRD for my studio but there's one question I don't find an answer in books / internet:
What's the height of the QRD? Its depth and width depend on the bandwidth you want to achieve. But what about the height? Can I build it as high as I want?

Thank for the links. I'll see what I can do. I found out there are some of the EL503 on ebay every now and then. Maybe I'll get some of these when they're available at a good price.

The M80 has a really nice creamy distorted sound. Though it doesn't get distorted as easy as the M40. But it had more low end as I tested both of them at the local guitar shop. But it's not easy to get tubes for the M80... Has really special ones. Maybe someone knows where to buy them at a fair pric...

Hello, I just got a Klemt Echolette M80 full tube-amp from the 60s. It has two speaker outputs with a switch for 5 Ohm and 20 Ohm. At the moment I'm playing it with a friend's Marshall 1960 4x12 cabinet connected to the 4 Ohm input and the switch on the Echolette put on 5 Ohm. It works really well a...

70$ is not too much for a new needle or system. You can spend hundreds on it if you want. But it's not always needed of course. I have a thorens td160 from the 70s and installed a ortofon nr.2 system. It sounds very great! With vinyl (or also CD) it's the most important to have units (player-->pre-a...

Ok, thanks for that simple but logic answer!