How flat are your curves?

[Bevan]

I'm wondering what most of your frequency responce curves look like, especially those of you that dont use eq.

i'm wondering how mine are compared to others, and whether i should stop moving my sub for the nth time and justt be happy with what i got.

if you got any curves of numbers too post i'd be very interested to see. also accounts of before and after room treatment attempts.

i'm not yet able to sort out a graph, but i can tell you after a week of dicking around with my new sub the best i got is

+9db@174hz
+5db@144hz
-5db@96hz
+5db@81hz
+5db@70hz
-7db@52hz
-8db@37hz
+7db@31hz

these are the major deviations from +-3. i cant say i notice any of the nodes when i listen to music. but i can only imagine what a flat curve sounds like. hopefully when i get my bfd i'll find out

b.

p.s i get my flattest response, surprisingly i thought, with my sub in the front corner facing backward at an angle, running it out of phase relitive to the sub so as to deliberately reduce output at the crossover frequency (where i have large possitive nodes)

 

[Sheep]

what sub do you have? and what size is your room and and shape?

Generally, I find the corner to have best extention, but on the right side of my tv stand to have the best SQ and blend with the rest of the system.

I wouldn't recommend placing subwoofers on side walls, or rear for that matter. If your room is "normal" there is a good spot on the front wall.

Sheep

 

[Bevan]

got an 8inch dynaudio sub250 in a 5.5x4.5m room. subs extention rated to 29hz but is about 26hz in-room. crossed over at 80hz.

the sub may be a bit small for the room, but the reason i put it in the corner was not for extention and spl's, but only cause its flattter there. musical accuracy is my only concern and i dont play loud, so i had definitely thought that i wouldnt be placing it iin a corner.

dont really have access to within 40cm the front wall as there is a bookcase running the lenth of it. but when i tried side wall placements the response was uneven, and started to drop off in the upper 50hz's. if i then increased the gain i would have a big hump from 60-90hz. couldnt win.

today i'm going to try moving the front speakers and maybe the listning possition, but as it stands my listning possition of 38% from the back wall does seem to offerf the best bet.

cheers

b.

 

[bpape]

The corner is almost never a place to achieve relatively flat response from the sub. It will provide the max output but also will exaggerate every room mode.

If you can, try placing the sub 1/7 from the front wall, 1/7 from the side wall, and up off the floor about 15".

The 37hz dip is likely a cancellation from the relative distance from the seat to the back wall. A nice bass absorber back behind you (like 8" or so thick) will kill that right off.

What you said about placement sounds about right. However, you missed what you're going to be getting. You said you got rid of the null and turned up the level but then got a hump from 60-90. That's exactly what you want. Get rid of the nulls and then use the BFD to cut the peaks.