04 December 2008

Apollo Studio Acoustics (Part 3)

Yesterday my friend Hanz came by and we went down in the new studio. He hadn't seen it at all. I noticed right away now that the acousticly treated ceiling was dry and we put a layer of Fiberglas coating and the first layer paint on the wall that a lot of the echoing was already gone. Probaly the ceiling had the most effect on this already. We decided to start doing an acoustics measurement in the studio for a first impression. I brought an active monitor downstairs, my notebook and the measurement microphone and we fired up the Room EQ software that we used before in my current studio.

In the diagram on the right you can see the results of that first measurement. We only measured from 20-500 Hz since that is where you can do the most compensation with acoustic treatment. As you can see there is a nasty peak at around 25 Hz, one at 50 Hz and two very close to each other between 80 and 90 Hz. These last two amplify each other and will be the most difficult to compensate. Probably some are harmonics of each other so when one is canceled out another will disappear as well. But that is difficult to predict.

Here you see another diagram showing also the dy-out time of the different frequencies. As you can see on the low frequencies they don't even fit in the graph which mean the dy-out time is over 1000 mS. On the higher frequencies it is more like 500 mS. For optimum result it would all have to go down to 200 mS or so. Not more because it will sound echo-like but not less because otherwise the room becomes to dead. But we are first going to focus on the problems in the low frequencies. We are going to put Bass traps in all 4 corners of the studio to see what happens after that. We decided to not try and fix everything at the same time but do it step by step. I just ordered the corner traps from AIX foam and took the largest one because of the peak in the very low frequencies. When they are in place we will do the next measurement.

We are also very busy painting at the moment. My wife did the most part in that actually, but as you can see in the picture our youngest daughter also 'helped' (ahum) a bit. The ceiling still isn't painted. The painter did arrive but left again, because we both agreed it would be better to spray paint the ceiling because of the very rough structure. Hopefully that will be done now on Friday. After that we can add the second layer on the walls ourselves and then on Monday finally the carpet can be laid (we hope). That will really be a relief since when the carpet is laid we can put more stuff downstairs that belongs there and it can stay there. Now I feel like we picked up everything already six times to much just to move it to another spot. But it feels good to get some things going again after a long period of waiting for the moisture to get out. Today we even removed the de-moisterizer.


Rob Janssen said...

Nou heb je wel alles mooi zwart gemaakt, maar is dat niet een beetje deprimerend (en heet in de zomer)? (kom ik ook weer eens laat mee, haha)

Je moet behoorlijk wat extra verlichting ophangen omdat je geen reflecties hebt van de muren, dus ik hoop dat je akoestische foam en je traps lichtere kleurtjes hebben :). Toen we in dit huis introkken heb ik de studiowanden en het plafond donkerblauw geverfd - daar heb ik heel erg spijt van gehad (maar 1 enkele raam, dus weinig licht). M'n 3 halogeenspotjes stoken genoeg om het 's winters comfortabel te maken zonder verwarming, maar 's zomers... pff.

Synth.nl said...

Dank voor je zorgen, maar ik werk graag in het donker. Er zitten helemaal geen ramen in want ik zit zelfs onder de grond :) Als het te warm wordt kan er airco in. Maar in een kelder is de temperatuur over het algemeen redelijk constant. We zullen zien. Depressief zal ik niet worden want er komt genoeg apparatuur in met een hoop lampjes :)