“In & Out” REW Frequency sweep

[JBL 4645]

Here’s something I suggested a few days go about room EQ.

“In the cinema EQ is done in the projection booth this is to keep any disturbance like someone moving around because it will affect the graph.

When, I worked as projectionist for Warner Bros back (1998) the sound engineer asked for my assistance to place the microphone a few feet forward and slightly to one side and then “get out”!

Also it took 2 days for the guy to EQ each of the 12 screens with the Dolby CP500, now then

Since I rather close to the door and I don’t know why I didn’t do this early, even thou I remember my days at Warner Bros.

So the title of this thread came to me out of the closet LOL. Yeah that’s right the (Kevin Kine, In & Out 1997) and no, I’m not gay.

So I’ve been In & Out the room like a yoyo, testing it first with me in the room and then out of the room, out of sight while REW performs its frequency sweep.

The difference looks appears so tiny when glancing at it first time, but there are some small variables.

Centre channel while being inside the living room.


Centre channel while being outside of the living room.

[JBL 4645]

Ran the centre though a few more times depressed the LF slightly and added a slight EQ in at 1Khz on the DCX2496. The left and right at present are miles out and I’ll work on them later.

Test was done while being outside of the room and good thing too because the high frequency is loud on the outside and I was inside the room I’ll be waving my arms around because of the pain of the high frequency, bending me ears.

[JBL 4645]

You’ll get a good workout with “In & Out” it feels good too.

Well its looking okay for now I’ll run a few more though then focus on the left and right and see how close I can get them with the centre, sigh this is going to take all-night and into the early morning hours.


Centre channel JBL control 5

[JBL 4645]

As an experiment I switched THX ON just for the sake of it there is only minor difference in the graph since the last one, I added a filter at 180Hz a tiny decrees -2db. I’ve selected 1/3 smoothing for this one.

[Allanvh5150]

I have to ask the question: Do you do your listening from inside the room or outside?

[JBL 4645]

I have to ask the question: Do you do your listening from inside the room or outside?

I let the frequency sweep run while being outside of the room otherwise my body will interfere with the frequencies, especially the high frequencies, the slightest moment and it wonders off up and down.

Play a sine wave high frequency stand still look at the SPL db, then move you’re arm or move you’re body around and the tone will make the needle on the SPL db go up and down.