Dr. Spec...svs w/as-f2 waveform..how's this?

steveinaz

The settings:
40Hz...crossover freq
25Hz...Filter
Level...3 lines up from "min" (the line increment before half)
Phase...0

pjdami

Very nice in room response Steve. That's the flattest looking curve I've seen besides Doc's.

Your x-axis is a little confusing though. What's the freq of the third from the left dot at 90 db? You are using 5 hz increments except for the 18 hz all the way to the left. Not sure if the tick line for the freq is to the left or right of the number there.

Looks really really good though. +/- 3 db almost with a radio shack decibel meter ( if that's what you are using). That's pretty awesome.

So has your nervousness turned into euphoria yet?

nebborjk

That looks like a really nice graph. Looks like the SVS added quite a bit to the 20Hz. region. Are you using a PEQ? Seems most set-ups have a positive bump in the 30-40Hz. range and you don't. Looks good and I bet it sounds even better.

pjdami

I think I may have answered my own question on the x axis. the numbers are actually the "in-between" tick marks?

steveinaz

Originally posted by pjdami
Your x-axis is a little confusing though. What's the freq of the third from the left dot at 90 db? You are using 5 hz increments except for the 18 hz all the way to the left.

3rd dot from the left is 25Hz, the freq's are 18, 20, 25, 30, 35...and so on to 100Hz.

I love this thing, does just what I'd hoped it would do...fills in the blanks from 40Hz-down.

steveinaz

Originally posted by nebborjk
That looks like a really nice graph. Looks like the SVS added quite a bit to the 20Hz. region. Are you using a PEQ? Seems most set-ups have a positive bump in the 30-40Hz. range and you don't. Looks good and I bet it sounds even better.

No PEQ, just the settings above with my Athena's running full-on.

steveinaz

Here's a plot of the Athena alone, then the combination of the Athena and SVS:

gatemplin

Have you tried adjusting the phase to blend them better at about 40 Hz?

steveinaz

I haven't, I was wondering about that "area" too, there's a noticable dip from both the Athena alone, and the combo...I was thinking maybe I need to up the XO to 45Hz?

pjdami

Better graph there Steve. Easier to understand the x-axis. Do both of your 8 inch drivers in the Athenas play the same frequencies or does one crossover into the other?

If they both play the same frequencies you may want to experiment with bumping up the crossover to say 50 or 60 hz and see how that affects the midrange on the Athenas. It may allow those delicate voices in the midrange to sound more to your liking. Maybe not. Cool to experiment with though and let the sub do the heavier bass stuff.

I'm assuming you are going to try the 20 hz tune next?

Congrats by the way as well.

steveinaz

Thanks Pjdami, I'm fine at 25Hz, though I'm going to try to iron-out that dip at 40Hz with the phase knob. The Athena's are a 2 1/2 way, I think...not sure. The SVS is really having a very subtle effect, and I like it!

gatemplin

Try making 5 graphs with phase at approx 0, 45, 90, 135, 180 to get you in the ball park. When you find the flattest response do some more sweeps to fine tune. If you still have a dip then adjust the crossover.
I think you can flatten that out just using the phase dial.

steveinaz

Ok, I'll give that a shot...

HBombToo

Originally posted by steveinaz
Ok, I'll give that a shot...

or increase the crossover frequency and plot 1 chart...

or nevermind cuz I had a few beers.

HBomb

Dr. Spec

Just catching up, here. Wow! Great looking blend. Fixing that mild dip will be as easy as upping the low pass to 45 Hz.

Remember, the 40 Hz setting will already be down a few dB at 40 Hz, so you need to account for that. The combination of both the SVS and the Athena will sum to unity.

I don't see any phase issues whatsoever. If you had cancellation, you'd see it in the form of an obvious null. Try 180 as a test and you'll probably see what I mean.

Well you're getting a rising response to 25 Hz, as advertised for that model. Back to baseline at 22 Hz - nice. If you aren't blasting at max volume, definitely plug a port and drop the switch to 20 Hz and enjoy infrasonic extension.

The most important part of this entire thread, though: "I love this thing". :cool:

steveinaz

Thanks to all for helping with this sub setup, I really appreciate the assistance. We've got some seriously knowledgeable people around here!

Tonight I'll bump the XO to 45Hz and plot, I'll post the results here. My Athena's sound like their 12' tall....incredible.

I-SIG

Looks like my RS SPL meter was the ticket for ya! Good deal. I can't wait to check it out Sat!

Wes

steveinaz

YES. Thanks bud for the loan. I've got to buy one soon. Saturday it is, again bring any music you want--we'll try to get more listen on this time and less drinking! LMAO!! I moved the XM tuner out to the patio system, just don't like the rolled-off highs and digital artifacts that thing has..XM NEEDS IMPROVEMENT!

Dr. Spec

First up the low pass to 45 Hz and replot.

If the results look good, then take the next step, plug a port, drop the tune switch to 20 Hz.

I'm betting the resulting curve will show a bit less room gain, and an extended response down to about 18 Hz.

steveinaz

Will do Doc. Plot will be posted this evening. I'll give the 20Hz tune a try and see how it plots as well.

nebborjk

What are you using to generate the test tones?

gatemplin

Nebborjk,

you can get test tones here:

http://www.snapbug.ws/bfd.htm

nebborjk

Thanks gatemplin.

Do you run those files as mp3 or convert to .wav or does it not matter?

gatemplin

I havent tried those ones, but I dont think it matters if you leave them as MP3 or convert to wav.

steveinaz

That's the tones I used, but only the 18-100Hz. I left them MP3 as my DVD will play them (CD won't).

gatemplin

How do you save those onto your computer? I just tried and cant figure them **** out. I assumed I knew how.

steveinaz

40/45 Hz crossover:

Dr. Spec

Interesting. You lost a bit at around 30 Hz and it didn't help much at 45 Hz (maybe just a tad). I'd try phase tweaking next (as mentioned earlier by others), just to be sure.

I'd only run 25-50 Hz to save time and just do a quickie plot at maybe 45, 90, 135, and 180 and see how it looks.

My old 20-39PC+ actually worked best at 180 in my room; it's certainly worth a try tweaking the phase - it often pays dividends.

Overall, most would kill for either FR. The 45 Hz setting is actually like +/- 4 dB from 100 to 22 Hz. Pretty amazing, really.

steveinaz

50Hz XO is flatter still! I'm wore out posting graphs, but 50 is just a tad flatter than 45Hz, especially in the 35-40-45Hz zone. Hmmm..

steveinaz

Here's a graph with the following settings:
XO=50Hz
Phase=0
Level=3
Filter=25Hz

gatemplin

That is very flat, you're lucky. I had a deafening 15 dB spike at 35-40 Hz before I got a PEQ.