Previous Thread
Next Thread
Print Thread
Rate Thread
Page 3 of 4 1 2 3 4
Re: I Graphed...Now What?
SirQuack #255499 04/04/09 07:01 PM
Joined: Dec 2008
Posts: 1,361
Zimm Offline OP
connoisseur
OP Offline
connoisseur
Joined: Dec 2008
Posts: 1,361
Thanks all, I'm going to work on those items first. My speakers are about 22 inches from the side walls, and the same from the front wall. Had not thought about that being a problem. Due to a doorway, I don't have unlimited mobility, but I have some room to adjust some. I'll do that first. I also have some DIY sound absorbers so I'll run it again with those in place at the 1st reflection and see what happens.

Really sad to hear I mis-read 3000hz for 300. Things really look erratic over 250. Ignorance was bliss!
Thanks for the help, one and all.


Panny 3000 PJ, 118" Carada, Denon 3300, PS3, Axiom QS8, PSB 5T, B&W sub, levitating speaker wire
Re: I Graphed...Now What?
Zimm #255504 04/04/09 07:23 PM
Joined: Dec 2007
Posts: 7,786
axiomite
Offline
axiomite
Joined: Dec 2007
Posts: 7,786
There is a lot of comb filtering going on at higher frequencies. It is recommended to measure using 1/3 octave smoothing to see what is going on at high frequencies.


Fred

-------
Blujays1: Spending Fred's money one bottle at a time, no two... Oh crap!
Re: I Graphed...Now What?
Zimm #255561 04/05/09 03:26 AM
Joined: May 2002
Posts: 10,654
shareholder in the making
Offline
shareholder in the making
Joined: May 2002
Posts: 10,654
Charles, keep in mind that the distances in question(hopefully to be kept as unequal as possible)are measured from the center of the mid-woofer cones, not the speaker enclosure.


-----------------------------------

Enjoy the music, not the equipment.


Re: I Graphed...Now What?
JohnK #255629 04/05/09 08:49 PM
Joined: Dec 2008
Posts: 1,361
Zimm Offline OP
connoisseur
OP Offline
connoisseur
Joined: Dec 2008
Posts: 1,361
Good point thanks. the ratio would be the same, but the measurements would move as i did not use that as the point of measurement. I moved the fronts closer to front wall and reduced the toe angle. Image held pretty well. Still need to re-run graphs.

And I'll add the 1/3 octave change recommended. As is, the chart above 200 looks like my room is about to erupt.


Panny 3000 PJ, 118" Carada, Denon 3300, PS3, Axiom QS8, PSB 5T, B&W sub, levitating speaker wire
Re: I Graphed...Now What?
Zimm #255652 04/05/09 11:24 PM
Joined: Jan 2008
Posts: 374
devotee
Offline
devotee
Joined: Jan 2008
Posts: 374
That looks like some good dip, I'll bring the chips.

Re: I Graphed...Now What?
StuntGibbon #255653 04/05/09 11:31 PM
Joined: Jul 2006
Posts: 12,077
Likes: 7
C
CV Offline
Founder, Axiom Upgrade Club
shareholder in the making
Offline
Founder, Axiom Upgrade Club
shareholder in the making
C
Joined: Jul 2006
Posts: 12,077
Likes: 7
 Originally Posted By: StuntGibbon
That looks like some good dip, I'll bring the chips.


Chips for EQ processing, I presume?

Re: I Graphed...Now What?
CV #255656 04/05/09 11:45 PM
Joined: Jan 2008
Posts: 374
devotee
Offline
devotee
Joined: Jan 2008
Posts: 374
Just for snacking while we watch him fix it? \:\)

Re: I Graphed...Now What?
StuntGibbon #255657 04/05/09 11:46 PM
Joined: Dec 2008
Posts: 1,361
Zimm Offline OP
connoisseur
OP Offline
connoisseur
Joined: Dec 2008
Posts: 1,361
\:\) ah yes, the dip jokes begin. My room deserves that.
But, as you can see, the folks around here do know a thing or two. While the graphing is frustrating in that every tiny move causes a hole somewhere, while fixing another, it is nice to get big picture changes in a visual format. As a result of JohnK, FredK, and SirQuack (among others) I decided to give the front speakers a move. First, closer together, so as to be further from the side walls (about 32" from mid-driver), while still about 40" from the front, with very little toe-in. Good graph, but the image was weak and the kick drums and bass guitars lost their feel. So I toed in about 5 degrees more. BANG. That was it, the sound-stage got wider than the room, which I did not have before, yet the vocals on "You and your friends" is dead center and clear, and every pluck and kick has a visceral feel. I would not have done this without the recommendations here, as I really felt there was just one sweet spot in my small room. Wow, i have much to learn.
I'm still surprised that decreasing the distance between the speakers and using a wider toe angle actually enlarged the sound-stage, but kept the detail. Man, there are some complex mathematics going on here. Anyway, here is the new graph, although I am not skilled enough to point to the benefits, the auditory changes are unmistakable.

Thank you gentlemen. I owe you a drink on your next trip to N.O. I still owe Tom a beer, but that squirrel seems to be stocked up.
[img][/img]


Panny 3000 PJ, 118" Carada, Denon 3300, PS3, Axiom QS8, PSB 5T, B&W sub, levitating speaker wire
Re: I Graphed...Now What?
Zimm #255663 04/06/09 12:17 AM
Joined: Jan 2008
Posts: 374
devotee
Offline
devotee
Joined: Jan 2008
Posts: 374
I'm still not sure that graph will keep pace with inflation.

Re: I Graphed...Now What?
StuntGibbon #255667 04/06/09 12:31 AM
Joined: Feb 2005
Posts: 5,210
axiomite
Offline
axiomite
Joined: Feb 2005
Posts: 5,210
Zimm I've always been a huge advocate of the importance speaker placement within a room, took me forever to get mine placed where I'm totally happy with the SQ.


Rick
Our Room

smile
Page 3 of 4 1 2 3 4

Moderated by  alan, Amie, Andrew, axiomadmin, Brent, Debbie, Ian, Jc 

Link Copied to Clipboard

Need Help Graphic

Forum Statistics
Forums16
Topics24,940
Posts442,457
Members15,616
Most Online2,082
Jan 22nd, 2020
Top Posters
Ken.C 18,044
pmbuko 16,441
SirQuack 13,840
CV 12,077
MarkSJohnson 11,458
Who's Online Now
0 members (), 145 guests, and 4 robots.
Key: Admin, Global Mod, Mod
Newsletter Signup
Powered by UBB.threads™ PHP Forum Software 7.7.4