My BFD curve

[Badger0-0]

Well, it isn't a curve, but you know what I mean.
I've only been playing for a few hours.

http://www.avforums.com/forums/attac...1&d=1145118173

What do you guys reckon??

I was aiming for flat and I'm not disappointed.
I can improve it if I play more. It was done with a 100Hz x-over and includes the whole setup.
I reckon I could go with a crossover anywhere from 80 to 100 hz

But I have loads of questions that I can't get my head around.
Should I really be chasing that blue target line, with the sub only, all the way up to 150Hz, when my x-over will never be that high?
If so, why?
Should I do a sweep all the way through the spectrum of my speakers?
Will this cause me to find more problems or should I use the BFD to flatten the whole spectrum?
Will Phil and Grant end up killing Jake?
What's the ending of 24 about?

Sorry, I was getting carried away
Any opinions appreciated

[bob1]

Why does it jump up past 100hz.

[Timbo21]

Looks good apart from that huge peak ramping up from 100hz to 150hz. Could it be that your sub is down too low compared to your mains?

[paulst10]

that looks fine! most importantly... does it sound good to YOU? cos at the end of the day, thats all that matters.

[Badger0-0]

That's what I'm asking.
As I said, it includes the whole setup, so I assume that's the result of the other 5 speakers cutting in.
My assumption is that 5 speakers running at 70dB will give a big jump on the SPL?
(I just ran AVIA white noise, the sub is at about 80dB and the others about 70dB).

But then, the THX-type spec doesn't make sense
All I know is, that ATM, it sounds pukka with the Chemical brothers.

[paulst10]

Originally Posted by Timbo21

Looks good apart from that huge peak ramping up from 100hz to 150hz.

could that be that the main speakers are set too loud ?? ... just a guess, as i havent used a bfd (i opted for the more convenient sms-1)

[Badger0-0]

Originally Posted by paulst10

could that be that the main speakers are set too loud ?? ... just a guess, as i havent used a bfd (i opted for the more convenient sms-1)

Exactly my first thought
But no, theyre -10dB compared to the sub.
Surely an extra 5 speakers cutting in will result in a big jump in volume

[paulst10]

badger, you have mordant shorts is that right ??

they arent the floorstander ones with a sub built in at the bottom are they ??

as if i remember... i thought the bass from them was overwhelming the rest of the sound when i heard them, a few dbs louder than the midrange and tweeters maybe ??

[Badger0-0]

No mate, 902's/903's all set to small.
The 902's bottom out at 55Hz.

I keep going back to the fact that 5 speakers kicking in are going to have a big effect, SPL-wise.
This makes sense to me, having thought about it.
The aim IMO, is not to get a constant 85dB (or whatever) across the board.
In that sense, my curve is fine.
But then again, the integration between the sub and the rest doesn't seem right

[recruit]

Have you tried running with just the L/R speakers in stereo and then running the tones ?

[Badger0-0]

Recruit, noted, I might give that a go

Now for the embarrassing bit.
It transpires I had the EQ in Winamp set to on. It was boosting 170Hz by about 5dB.
I could have sworn it was off
A quick glance gives more realistic levels.

Too many bloody settings on all these gadgets, IMO, after all I am mid 40's and that's my excuse
At least it kept you lot on your toes
I'll post new figures tomorrow for you to think about.
Now, I have an appointment with someone called Stella
Thanks chaps

[Mr Incredible]

Originally Posted by Badger0-0

Too many bloody settings on all these gadgets, IMO, after all I am mid 40's and that's my excuse

Are you talking age, waist size or IQ here?

[Badger0-0]

Age.
and IQ, ATM
Waist-size, I'm only 30

I'm listening to all sorts now and got massive booms all over the place.
EDIT: not sub freqs.

I ask the missus if she can hear the difference (when I put my Winamp EQ in and out), she says "yeah, but they both sound OK"
What chance have I got?????????

My head hurts.
This "Stella" is a tasty bird
Another post tomorrow

[AngelEyes]

Hey badger

I assume you are runninmg the sweeps manually from your PC?

Why are you using Winamp? If you burn the test tones to a disc you have one less thing to worry about and can control the sweep from your remote. I found this much more convenient (until I got my head round REW).

You definately want to run sweeps with your fronts only and sub only and combined to get a picture of what is going on and what cause which peak etc.

[Nimby]

I second burning the tones onto a CD. I used to use the computer to play tones like a multi-track music album. But I don't play music from my computer. So it makes more sense to use the CDP or DVDP as it is a fixed part of the reproduction chain.

I printed out some simple template forms onto A4 paper where the track numbers are marked vertically against frequency. With vertical columns for several runs of SPL meter readings. The DVDP shows the track numbers on the display while the tones are playing so it doesn't need the TV screen to be on.

I must emphasise that the SPL meter (or test mike) must be at ear level at the usual listening position. I used a tall box to simulate the occupant of the chair. A cushion on top of the box isolated the RS meter from box vibrations.

Some sub/speaker testers seem to prefer to set the meter set up vertically. Others at 45 degrees. I used mine flat on its side after carefully checking that it made no difference being on its side or flat on its back. It was just easier to read the meter from the chair beside the meter.

The tones were long enough to allow a shift of range in mid-tone if requred. The meter reads lower (and more accurately) when the needle is above center on the dial than when it is below the centre marking. The meter instructions mention this.

Those seeking a nice, free, and simple graph drawing software should look at Room EQ Wizard. This accepts simple text data in the form:

10, 86
20, 87
30, 89
etc.

Enter your raw readings into a Wordpad document on your computer and save it then just open the document into Room EQ Wizard to see your curve.
(This program was recommended on another sub forum)