My brand new bad sounding control room

Hello everyone, I've just finished building a control room for composing, editing, mixing professional purposes and due to a lack of time I had someone doing it for me. I did some tests and calculation before begining and discovered that I had standing waves in the 3 axes of the room at 130 Hz and 175 Hz so I was expecting some troubles. Now I'm discovering that despite the treatment already done the thing is still there and frequencies between 120 Hz and 400 Hz are too much present. :cry: Under 120 Hz , the response seems to be quite good thanks to the panel traps already build in the 4 corners (they really work only under 100 Hz) and above 500 Hz I don't have too much problems either. I feel that I will experience difficulties with mixing in this room if I don't do these modifications. The hi-bass is moving too much and some notes of a bass line jump out of the speakers (Adams S3a). So i was wondering if building hi-bass absorbers acording to the "Ethan type"and hanging them in the ceiling-wall junction would be working or not. Because I like a lot the look of the room I don't want to break it again completely but does this kind of absorber work if the wall behind it is already covered with 10 cm of fiberglass+fabric? If someone knows the answer I would be delighted. Sorry for my bad english Raymond

could you post detailed measurements of the room, the treatments, and some photos?

Nice! What a fast response! Thanks. helo Gullfo The room is rectangular and is 6,76 meters long, 3,93 meters wide and 2,58 meters high. The dimensions were dictated by the fact that the room used to be a part of the garage in my house. The walls are full concrete blocks and are covered with 10cm high density rockwool and medium density fiberglass on the side. The front wall is 20cm of the same material. The ceiling is 10cm of the same , 2cm air gap 3 layers of platerboard, rockwool and 5 cm air gap , and is hanged by ...hangers with rubber (damn my english!!!). The ceiling was made like this for isolation with the living room above.

some views with the fabric ..... It's nice looking but too much 130, 170 Hz and low mids.... :cry:

just a couple of thoughts - the cabinets behind the monitors - they may be doing something with the response - if you have a couple of porous absorbers, you could put them between the stand and cabinet and see if that alters the response. presumably you're gauging the room response based on some measurements? one note is that the room dimensions seem to indicate a pair of second and third harmonic modes at around 130... From Measurements

								
	ratio	size	m	sqrt(2)	bolt	ebu	iec	> 5%
h	1.00	8.46	2.58		TRUE	TRUE	TRUE	TRUE
w	1.52	12.89	3.93	0.08				
l	2.62	22.18	6.76	0.22				
								
	ax 1st	~note	ax 2nd	~note	ax 3rd	~note	ax 4th	~note
h	66.51	C2	133.03	C3	199.54	G3	266.05	C4
w	43.66	F1	87.33	F2	130.99	C3	174.66	F3
l	25.39	G0	50.77	G1	76.16	D2	101.54	G2
								
	tot vol	tot surf	edge	area	raw rt60	rate	Dc	mfp
ft	2421	1166	174	286	1.34	0.43	6.00	8.31
m	68.54	108.29	53.08	26.57				
								
	T(ms)	eyring	millington		Fcut	~note	Fc	~note
	7.38	1.16	1.03		25.39	G0	203.34	G3
								
	ratios	diatonic	stdev	modes	df		Fs	~note
h-w	1.52	V	0.07	263	0.52		279.36	C#4/Db4
w-d	1.72	°VII	0.07					

Thanks I will try that when I get some absorbers Yes I did some calculation with modecalc in order to know the modes. And after acoustic treatments, there are still these 130 and 170.... I 'm wondering helmholtz or panels or porous absorbers... Raymond

low to mid range slats would be nice and panel traps work as well.

wow, eye orgasm here!

WOW.....the best looking control room.... ever, hope you can fix the problem, congrats