first graph...?

[hasse_swe]

hello!
made my first run...

for instance in this first graph......whats the right way to approach "the set target level", before running the find filter peak..?

#1: set target level to 72 dB to level down frequencies to match the very low level between 20-27hz?
or
#2:Leave target level as in graph and do nothing about the missing low freq?
or
#3:find if possible... new place for sub
or
#4:Move furnish in the room

thanks!/H

Equipment to tame:
Velodyne spl1200R

[hasse_swe]

no one with any suggestions?....

[Wayne A. Pflughaupt]

for instance in this first graph......whats the right way to approach "the set target level", before running the find filter peak..?

I prefer to set the target at a good half-way point between the peaks and depressions, and equalize from there. However, I’m typically manually equalizing, and I’d apply some boost to the depressions.

If you’re intending to let REW ato-equalize, you probably have the target set about right

#1: set target level to 72 dB to level down frequencies to match the very low level between 20-27hz?
or
#2:Leave target level as in graph and do nothing about the missing low freq?

It’s a fairly narrow dip, probably won’t be noticed that much. It’s too deep to try to equalize up.

Regards,
Wayne

[hasse_swe]

hi!

Wayne A. Pflughaupt wrote:

I prefer to set the target at a good half-way point between the peaks and depressions, and equalize from there. However, I’m typically manually equalizing, and I’d apply some boost to the depressions.

If you’re intending to let REW ato-equalize, you probably have the target set about right

yes i'm going for the auto first to get the hang of it...
ok...so half way between dips and peaks to start with.... ok..

Wayne A. Pflughaupt wrote:

It’s a fairly narrow dip, probably won’t be noticed that much. It’s too deep to try to equalize up.
Regards,
Wayne

yes the dip...isn't much to do about...i meant the whole range between 20->up to dip..

are there any general "rules" how much decrease (in dB)/filter setting you can use?...or can you use whatever the "fbq2496" can adjust down..so to speak?...if you know what i mean..(sorry in case of bad english!..
thanks!/H

[Wayne A. Pflughaupt]

are there any general "rules" how much decrease (in dB)/filter setting you can use?...or can you use whatever the "fbq2496" can adjust down..so to speak?...if you know what i mean..

Well, if you decrease everything across the board to where the 20 Hz area is, you’ll have to boost the volume back up to make up for the huge loss in sound level. That will have the same effect as if you had just boosted the below-20 Hz range. Might not be a good idea to try to boost up that low range by any method. However, if it’s a problem you sub will let you know – it’ll start making nasty noises.

Have you tried any other locations? Usually a good corner will get you the best extension.

Regards,
Wayne

[hasse_swe]

Wayne A. Pflughaupt wrote:

Have you tried any other locations? Usually a good corner will get you the best extension.
Regards,
Wayne

yes i have tried atleast 6 sub-locations with similar results.. :/
i'm gonna check the locations again...must be somewhere in room it's better..
or ...maybe perhaps it's my seating position thats in a low freq null place..
thanks/H

Just a suggestion, but did you try changing the phase of the sub?

[hasse_swe]

jakelm wrote:

Just a suggestion, but did you try changing the phase of the sub?

hi!
yes i tried phase at 0,90,180,270 degrees...no difference...
maybe room is bad for low freq?... (have an permanent opening into hall,kitchen).....
regards/H

What I would try, if you can, is taking the sub out of the room. Put it in a large room or outside and do a near field measurement, to see if its the room or the sub itself.

[hasse_swe]

jakelm wrote:

What I would try, if you can, is taking the sub out of the room. Put it in a large room or outside and do a near field measurement, to see if its the room or the sub itself.

hi!
already done that...
sub performs well from 20Hz->up

going to stuff the sub around an hour or two now to see if i find anything better......
/H

[hasse_swe]

hi!..
ok...measured sub at 8 different locations...
and no one is good.....hmmm

the closest i get is this one:
but then instead i have that nasty dip...

so...... it seems i have to go for the first graph......or? suggestions?

Are you measuring just the sub? Or the sub with the main speakers? It could be the main speakers that are causeing a dip in the 32hz-47hz region.

I had a similar problem @ ~70-80hz, ended up being a phase issue and corrected my phase AND xover adjustment on my main front spreakers.

Just a thought.

[hasse_swe]

jakelm wrote:

Are you measuring just the sub? Or the sub with the main speakers? It could be the main speakers that are causeing a dip in the 32hz-47hz region.

I had a similar problem @ ~70-80hz, ended up being a phase issue and corrected my phase AND xover adjustment on my main front spreakers.

Just a thought.

hi!
it's only the sub...cross over @ 200....
/H

[hasse_swe]

Wayne A. Pflughaupt wrote:

Well, if you decrease everything across the board to where the 20 Hz area is, you’ll have to boost the volume back up to make up for the huge loss in sound level. That will have the same effect as if you had just boosted the below-20 Hz. Might not be a good idea to try to boost up that low range by any method. Regards,
Wayne

hi!
back at this side of forum a while now... (been playing with the fbq )

i was thinking a little about that first graph i posted (first post)....
and about boosting...

as my setup is now.. the sub is running at idle (i can imagine)
the sub's volume is at position 1 out of 100!
so whats you opninion in that case?

raise the sub volume to atleast 1/3 of possible (that will certanly bring up the low freq-loss that is in graph approx 20-27hz... and then bring down the rest a huge (10-20db)amount probably...
or stick with 1/100 volume setting and just boost 20-27 range?
or?
thanks/Hasse

[Wayne A. Pflughaupt]

raise the sub volume to atleast 1/3 of possible (that will certanly bring up the low freq-loss that is in graph approx 20-27hz... and then bring down the rest a huge (10-20db)amount probably...
or stick with 1/100 volume setting and just boost 20-27 range?

Okay, I didn’t know your sub wasn’t being run hard. That’s a different story!

Either method will get the same results, but it’s probably better to just boost the bottom end than to plaster the upper end with a lot of filters (although it does look like you could use some adjustment up there). If you over-do it, your sub will let you know – it’ll start making all kinds of nasty noises.

Regards,
Wayne

[hasse_swe]

Wayne A. Pflughaupt wrote:

Okay, I didn’t know your sub wasn’t being run hard. That’s a different story!
Either method will get the same results, but it’s probably better to just boost the bottom end than to plaster the upper end with a lot of filters (although it does look like you could use some adjustment up there). If you over-do it, your sub will let you know – it’ll start making all kinds of nasty noises.

Regards,
Wayne

ok!.. i knew i must have missed mention something obvious.... (the level on sub)

fyi...had to raise my receivers sub vol to max setting +10db when connection the fbq to get atleast
couple of leds to light up...hmm seems Pioneer doesnt put out much volts at subw output...
(fbq input setting at -10db of course)
thanks.../H