freq response charts

[mike c]

im not sure if what I did is right ...
I played the 80hz freq. to 75db for each sub
ep500 position 1
cht15r position 2
both running at their respective positions

 

[gene]

What measurement tool were you using?

Did you have the exact same subwoofer and mic placement for each measurement? Moving a sub / mic even a few inches will affect your response.

 

[mike c]

just an SPL meter ... mic is in the exact same position
these already have ratshack correction values
im trying to figure out roomeqwizard
the subs are in two different positions

 

[Sheep]

Mike, you should really re position your equipment. Running the TV on the long wall is not good for bass.

SheepStar

 

[JeffD2.]

At minimum, repositioning of the EP-500 is called for. The nulls at 50 and 100hz is a classic symptom of a room mode (first null x2 = second null).

 

[mike c]

so that would indicate my measurement is correct? right? just my positioning sucks!?

 

[ScottMayo]

You have subs and speakers up against the wall, that's a recipie for an acoustic mess, most of the time. Get the speakers off the wall, and if you're sitting against a wall, move out into the room. Even so, you will need to treat the area with absorptive material if you want the frequency to even begin to even out. EQ can only do so much. You might want to start a thread in the acoustics section here.

 

[JeffD2.]

so that would indicate my measurement is correct? right? just my positioning sucks!?

Positioning is everything. I was able acheive +-10db flat from 20-200Hz just from positioning speakers/sub. It takes a lot of time and effort, prolly in the order of some 16 hours for me and no less than 7 different sub placements. THEN I considered PEQ, room treatments, etc.

You might want consider co-locating the subs to make it easier for now, until you're more familiar with calibration.

Agree this thread should be moved.

 

[mtrycrafts]

im not sure if what I did is right ...
I played the 80hz freq. to 75db for each sub
ep500 position 1
cht15r position 2
both running at their respective positions]

It would appear to me that you are not gaining anything by having two subs.
It appears that the response from both is about the same as the 15r by itself, just about, at the mic's location.

This is an interesting teaching tool about acoustics at work. The 500 suffers from positioning most likely more so that the 15r. And the 15r is not suffering from that 50Hz drop. If you will be crossing over to the sub at 80, the dip at 100 will not be an issue.

The 15R by itself and that Behringer EQ will flatten it out in a hurry as it seems it will be easy to do. You cut the bands between 50Hz and 71Hz and just nudge the 31 Hz area and you will have it flat to 80, flat enough that you will not differentiate it.

 

[mike c]

this receiver can only crossover at 80 I think ... but in the future, I was looking at a 60hz crossover.

those subwoofers are at LEAST 12" away from the back.

will putting couches (leather material, therefore reflective) affect the freq. response? I was thinking that because the subs right now have a clear line of sight to the wall behind me (stupid chairs) the waves from the sub and from the wall behind me are causing the dip in my seating position,=.

 

[mtrycrafts]

this receiver can only crossover at 80 I think ... but in the future, I was looking at a 60hz crossover.

those subwoofers are at LEAST 12" away from the back.

will putting couches (leather material, therefore reflective) affect the freq. response? I was thinking that because the subs right now have a clear line of sight to the wall behind me (stupid chairs) the waves from the sub and from the wall behind me are causing the dip in my seating position,=.

You are talking low frequencies with wavelengths very long, so all the walls interact with it. I doubt the couch will help much but you can try and redo your FR graph. Why not try just the better response sub and that Behringer EQ.

 

[mike c]

will try to get a roomeqwizard software measurement first before moving the subs.

reading, writing, playing the tones, clicking next track sucks when you only have two hands

 

[mike c]

EP500 position 1

15R position 2

 

[mike c]

I took two measurements of both subs running, nothing changed, yet these two graphs are different.

im having a hard time reading these charts ... the Y axis jumps in 15 increments.
can these be fixed with eq? or should I just move subs

 

[mike c]

position 3
15r

ep500

both

both experiment positions

 

[mtrycrafts]

I took two measurements of both subs running, nothing changed, yet these two graphs are different.

im having a hard time reading these charts ... the Y axis jumps in 15 increments.
can these be fixed with eq? or should I just move subs

Not sure why they are different, but there are differences here and there. Something must have changed enough.

I know what you mean about having just two hands Takes a lot longer, doesn't it.

I would suggest trying a few different locations that you could live with afterwards, then run a plot. I doubt location alone will help you. You might consider some room treatment if you can live with it, and certainly looks like EQ time. Best to cut the peaks but it is tricky as that will also affect side frequencies, etc. Have you noticed the spl levels changing as you move your head a few feet? I am helping a friend; pulling my hair. Now, beside being deaf, I will be bald as well.

 

[mike c]

I therefore conclude that my room sucks.
i've moved the subs to just about every possible location (then I put the sub in the seating position and moved the mic) this frikkin room sucks

dammit. ignorance is bliss

 

[mike c]

best I could do, 1 sub: EP500 "FULL" trim

un-eq'd line: dark blue line
suggested BFD eq: blue line

 

[Buckle-meister]

Hi Mike.

You have subs and speakers up against the wall, that's a recipie for an acoustic mess, most of the time. Get the speakers off the wall...

...those subwoofers are at LEAST 12" away from the back.

I think ScottMayo was referring primarily to the towers.

...will putting couches (leather material, therefore reflective) affect the freq. response?

Mtrycrafts is correct; due to the long wavelengths from the subs, obstacles such as people, chairs etc will have little to no effect. However, a shiny leather couch will have an adverse effect on high frequencies from your towers as they ricochet off it

I therefore conclude that my room sucks.

Am I right in saying that all the graphs you've posted are just the responses of the subs on their own or combined? If so, you might also consider looking at the sound of your towers and sub together, since the sub will have an influence, albeit decreasing with increasing frequency, above the crossover point.

First thing to do if you've at all got the space though, is to get those speakers away from the walls!

 

[mike c]

but the towers are a good 2 feet off the walls

the graphs are either from 1 or 2 subs ... no mains