Atlas 15" room response

[xstephanx]

Ive got my atlas 15 in a 6.5 cu ft box tuned to 20hz via two 4" ports, and was curious what kind of frequency response i was getting, so i downloaded room EQ wizard and made some plots!

Here is the uncorrected results taken with a rat shack spl meter.


Would you guys reccomend i get a bfd? from what i can see my response is pretty good, in fact once you add in the correction values, it should be even BETTER.

After this plot it made me realise i was missing out on a fair amount of low end, must be the subsonic filter on the amp. Is anyone knowledgeable in lowering this down to say, 16hz? i still get enough output at 10hz to visibly flex my windows, so i would definately benefit from changing out the subsonic filter, after all, its free low end


just for people wondering my LxWxH of my room is 12x10x8

[Brian Tatnall]

I suggest calculating the graph with corrections before making any decisions. Move the sub around a few times to determine what is being caused by the room also.

[simon5]

I suggest the same thing, with a Ratshack, you add alot of dBs at lower frequencies... for example, +20 dB at 10 Hz hehe.

http://www.hometheaterhifi.com/utili...load-page.html

[xstephanx]

After looking at those correction values i have a MUCH better room response than i thought. Im not too concerned about that 19hz null because infasound linearity isnt too important. I think ill just keep it where it is and go eqless.

However i would still like to be able to lower that subsonic filter so its -3@16hz

my predictions of room gain from the win isd graph were surprisingly accurate if not a little conservative.i guees i really am getting 6db/oct gain under 70hz

[simon5]

Remember these correction factors are for a older model. I think these are still fairly accurate anyway.

We would need someone to test the new ratshack model number to be a bit more accurate.