Previous Thread
Next Thread
Print Thread
Rate Thread
Page 8 of 12 1 2 6 7 8 9 10 11 12
Re: My Superchunk Bass Trap Project, Graphs includ
SirQuack #144149 09/12/06 07:05 AM
Joined: May 2002
Posts: 10,654
shareholder in the making
Offline
shareholder in the making
Joined: May 2002
Posts: 10,654
Well Randy, I'm suitably dizzy from looking at all the response curves and trying to equate the four or so different room effects with them. The most prominent features are still the dips around 140-150Hz(wavelength about 8') and 240-250Hz(wavelength about 5'). At those frequencies the sub shouldn't have a significant cancellation effect on the mains, so the likely problem is main driver cone to room surface distance of about .25 to .30 wavelength. Following up on John B.'s reply, it appears that your M60 cone centers are about 7"+15"+4"=26" from the wall behind, so that would fall into the quarter-wavelength area around 140Hz. It might be interesting to see if moving them out at least a foot farther had a significant effect on the frequency of the lower dip. As to the higher frequency dip, possibly the floor? Get rid of it!

Of some interest relating to the alternative(or realistically, complementary)electronic room equalization process is the article by Mark Sanfilipo in Audioholics. This appears to be by far the most thorough analysis(the math doesn't necessarily have to be studied)of the Audyssey system used in some Denons and Onkyos, and explains some of the difficulties in getting good results. The graphs are interesting.


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

Enjoy the music, not the equipment.


Re: My Superchunk Bass Trap Project, Graphs includ
JohnK #144150 09/12/06 12:15 PM
Joined: Feb 2006
Posts: 6,471
axiomite
Offline
axiomite
Joined: Feb 2006
Posts: 6,471


NERRRRRRDS!!!

Re: My Superchunk Bass Trap Project, Graphs includ
JohnK #144151 09/12/06 01:55 PM
Joined: Jan 2004
Posts: 13,840
Likes: 13
shareholder in the making
OP Offline
shareholder in the making
Joined: Jan 2004
Posts: 13,840
Likes: 13
Thanks Johns

Well if you look at the white line, you can see there has been some improvement in those 140hz and 240hz dips.

The 145hz dip has gone from 52dB to 56dB to now 60dB, so an overall improvement of 8dB from when I had no treatments.

The 240ish hz dip has gone from 53dB to 63dB to 70dB which is a great improvement.

And the 250hz dip which started showing up after I added Superchunks, is now at about 70dB as well.

To me the overall results from about 160hz to 300hz have improved a lot and are much narrower than the two previous results, everything contained within about 12dB.

On the lower end, I think I need to work on my sub placement and calibration. I had my crossover on 80hz, so the mains would not have contributed to the results getting worse after my second graph, which showed much improvement in the 40hz and 55hz peaks.

You can see from my picture where I have the speakers. I already have the panels in place for first reflections, so I really don't want to move the mains much as they are imaging great. However, the sub can be moved. Also, I still have some more 703 to finish some more corner bass traps, which should help on the low end.




M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85


Re: My Superchunk Bass Trap Project, Graphs includ
SirQuack #144152 09/12/06 05:12 PM
Joined: Jun 2003
Posts: 8,488
T
axiomite
Offline
axiomite
T
Joined: Jun 2003
Posts: 8,488
Wait wait wait...

You've spent how much time and money on that (gorgeous) setup but you won't entertain the notion of moving the mains?

Don't MAKE me come over there....

Do you actually listen to any music anymore, or just make graphs?

My favourite way to encounter nuts is in a chocolate chip cookie.

Randy, I've learned a lot from you. Thank you very much for documenting your adventures.


bibere usque ad hilaritatem
Re: My Superchunk Bass Trap Project, Graphs includ
tomtuttle #144153 09/12/06 06:13 PM
Joined: Jan 2004
Posts: 13,840
Likes: 13
shareholder in the making
OP Offline
shareholder in the making
Joined: Jan 2004
Posts: 13,840
Likes: 13
Thanks Tom.

Prior to starting down the venture of treatments, my mains/sub have been placed in a variety of locations. Keep in mind, I am limited as I can't go in front of the screen, and the stage is only so deep. Right now the sound is amazing compared to no treatments, everything is much clearer and better clarity. I know some people think this is another "snake oil" topic, but I am not one of them, my ears tell me that much. There is also plenty of research to back treating a HT/Recording room properly.

I hate when I encounter a raison in a chocolate chip cookie, even though I like raisons, it just ain't right.


M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85


Re: My Superchunk Bass Trap Project, Graphs includ
medic8r #144154 09/12/06 06:59 PM
Joined: Jan 2006
Posts: 683
aficionado
Offline
aficionado
Joined: Jan 2006
Posts: 683
Quote:

NERRRRRRDS!!!




Lost it laughing ...good one man!


Epic 80 / SVS PB13 Ultra
Denon 3805 / M2200 Outlaw Monos /
Sammy 55" LED
Re: My Superchunk Bass Trap Project, Graphs includ
SirQuack #144155 09/12/06 08:01 PM
Joined: Aug 2004
Posts: 6,379
Likes: 7
axiomite
Offline
axiomite
Joined: Aug 2004
Posts: 6,379
Likes: 7
Sorry, we're saying "move the mains temporarily so we can confirm their placement is the cause of your 145 Hz dip", not "move the mains and invalidate all of the other work you have done".

There are other options for fixing the dips, but you need to know the cause first.

I share your sense of horror at the idea of mucking everything up again and having to start over

Last edited by bridgman; 09/12/06 08:01 PM.

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8
Re: My Superchunk Bass Trap Project, Graphs includ
bridgman #144156 09/12/06 09:44 PM
Joined: Jan 2004
Posts: 13,840
Likes: 13
shareholder in the making
OP Offline
shareholder in the making
Joined: Jan 2004
Posts: 13,840
Likes: 13
Thanks John,

I'm sure things will improve more if I ever get more bass traps. In reality, I should have completed them first, and then worried about first reflections later. Oh well, I guess that is why my wife thinks I have A.D.D.


M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85


Re: My Superchunk Bass Trap Project, Graphs includ
bridgman #144157 09/12/06 09:53 PM
Joined: Jun 2003
Posts: 8,488
T
axiomite
Offline
axiomite
T
Joined: Jun 2003
Posts: 8,488
Who is "we"? Are we amused?

John, if rearranging Randy's room "horrifies" you, I think you need to see more and larger spiders.

Really, Randy, I'd just start over. John's just shining you on. You'll NEVER be able to tame those two enormous frequency chasms in that room, no matter what you try. And - now that you have quantified the defects - you'll never be able to REALLY enjoy it anyway. I mean seriously, aren't you going to be constantly listening for those giant suck-outs at 145 and 240 Hz? I certainly would be.

You know the family and I were planning on a big visit to Iowa next spring to spend time with you, but since I am SO susceptible to discrepancies in the 120-150Hz range and you are obviously unwilling and/or unable to actually show some sensitivity to my plight, I think we better just call the whole thing off.

Pity.

"Enjoy the music, not the big, oddly-shaped black things"




bibere usque ad hilaritatem
Re: My Superchunk Bass Trap Project, Graphs includ
tomtuttle #144158 09/13/06 01:48 AM
Joined: Jan 2004
Posts: 13,840
Likes: 13
shareholder in the making
OP Offline
shareholder in the making
Joined: Jan 2004
Posts: 13,840
Likes: 13
You know your welcome anytime I can talk my wife into it. ha ha

I'm sure the kids and wifes would get along great while you and I run down to a few pubs.

Don't worry, I'll have that freq response as flat as Colorado by the time you show up.


M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85


Page 8 of 12 1 2 6 7 8 9 10 11 12

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