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#5121 - 08/27/02 12:25 PM Port chuff from the EP350
chesseroo Offline
connoisseur

Registered: 05/13/02
Posts: 4788
Loc: western canada
I thought i would post this since i had an occurrence the other night that was unexpected.
While watching the Lord of the Rings dvd, there was a scene in the Mines of Moria where goblin drums start thumping.
Well my EP350 sub actually produced port chuff for almost the entire drum beat. I ended up turning down the gain to about the 10-15% mark (8 oclock) from about the 40% (10 oclock) position and the EP350 was still pushing out the chuff, although much less of course.
Considering all the other dvds i've watched so far to date, which included the likes of massive explosions from U571, i was surprised to hear the port chuff during only this one instance.

Did anyone else have a similar experience wtih the LOTR dvd and that scene?
If someone else with an Axiom sub (EP350 if possible) would replay that scene and tell me what happens with their sub, i'm curious to know.
_________________________
"Those who preach the myths of audio are ignorant of truth."

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#5122 - 08/27/02 12:36 PM Re: Port chuff from the EP350
jkohn Offline
old hand

Registered: 01/06/02
Posts: 96
My old Def Tech Prosub 80 used to do that on demanding movies. The LotR:FotR DVD in particular is very demanding of subwoofers, a couple of my friends mentioned the same problem you had. In fact, one of them is now considering a getting a new sub becuase of this.

Given the large amount of bass, and the fact that the overall sound level of this particular DVD is higher than normal, if you've never calibrated your sub relative to the other speaker with an SPL Meter or if you intentially run the sub a few db "hot", then it could be that the bass is getting emphasized somewhat more than it should. A lot of people like a little extra boost in the lower bass region, and for many movies it can sound very good, LotR:FotR is one of those movies where the bass is already somewhat emphasized so you don't want to push it too much.

BTW, not to brag but my SVS-20-39PCi had no problems at all with this movie; just clean, smooth, awe-inspiring bass.

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#5123 - 08/27/02 03:02 PM Re: Port chuff from the EP350
davehead Offline
old hand

Registered: 08/07/02
Posts: 70
Loc: Pinellas Park, FL
jkohn,

I also can report clean, smooth, awe-inspiring bass from my SVS 20-39PCi during that scene in LOTR. I was grinning like an idiot while it was playing...

David


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#5124 - 08/27/02 03:49 PM Re: Port chuff from the EP350
chesseroo Offline
connoisseur

Registered: 05/13/02
Posts: 4788
Loc: western canada
It was THE only scene in any of the movies i've watched so far.
I thought it kinda funky but ya, the sub sounds were truly amazing otherwise (my bass defaults are at 0dB, no intentional hotness here).

What i found even more funky is that by replaying the scene i could actually dry my hair by the volume of air escaping the ports at about a 3 foot distance!
_________________________
"Those who preach the myths of audio are ignorant of truth."

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#5125 - 08/27/02 04:04 PM Re: Port chuff from the EP350
CAV104 Offline
veteran

Registered: 04/03/02
Posts: 118
Loc: Lake Worth, FL
Hey Chess,
You might be onto something with the hair drying thing.

CAV104

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#5126 - 08/27/02 05:21 PM Re: Port chuff from the EP350
polara Offline
old hand

Registered: 05/19/02
Posts: 64
my nieghbors enjoyed ( i hope)lotr with my vmps large sub-it has a passive radiator so no chuff

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#5127 - 08/27/02 05:56 PM Re: Port chuff from the EP350
lando622 Offline
old hand

Registered: 02/16/02
Posts: 82
Loc: Florida, USA
I didn't experience any chuff on LOTR with my EP-175. My wife kept asking me, "Can you feel that?" because it actually felt like the couch was shaking at 12-14 feet away. I'm pretty confident in my sub calibration, and it is not running hot. This is one of those movies where I subtly eased into the volume as I wasn't sure how much my system could take. Everything worked out great, and the sound was incredible.

lando
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lando

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#5128 - 09/03/02 06:54 PM Re: Port chuff from the EP350
ravi_singh Offline
connoisseur

Registered: 03/14/02
Posts: 1351
Loc: Montreal
Chess,

I just watched the first 25 minutes of the movie and i have lost my ability to speak, and my jaw is still on the floor. The sound out of this movie is so beautiful and incredible, and the visual is, too.

I unfortunately only have the EP125, and it definitely was being severly taxed by this movie. I heard random chuffing here and there, though it wasn't too strong. I have the gain set to about 45%, and at 0dB on my receiver.

This is making me wonder if I should be saving for an SVS, however I think my neighbours would vote against that!

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#5129 - 09/04/02 11:53 AM Re: Port chuff from the EP350
chesseroo Offline
connoisseur

Registered: 05/13/02
Posts: 4788
Loc: western canada
I'm glad to hear i'm not alone.
THat goblin drum scene is the real killer. The rest of the movie was smooth smooth.
_________________________
"Those who preach the myths of audio are ignorant of truth."

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#5130 - 09/04/02 11:19 PM Re: Port chuff from the EP350
john_henderson Offline
veteran

Registered: 09/03/02
Posts: 186
I have just finished playing the movie and specifically the scene you are mentioning, I have 3 subs in my setup 2 EP-175's and 1 EP-350. I did not get any port chuff no matter the volume (my wife did come down at one point to mention that I was making her good crystal dance around in her china cabinet and that if I wished to still reside here with my equipment to cease and desist. I guess I could consider that port Chuff). I am not sure if you have setup your system for levels using a SLM (sound level meter), I have the Denon 5800, when I setup the system I purchased a SLM from Radio Shack and set all the levels to reference level specified. On the 5800 there is also a sub max limit setting that once I set the upper limit to when I hear distortion the amplifier will not drive the subs beyond that setting. This may have something to do with my not getting any port chuff. I don't know what amp you have but some other receivers also have this function. That scene in the movie and many others in the film certainly do push your system to the limit! (my wife included). The other movie to get that will give your system a real work out is The Haunting DTS-ES version, maybe see if you can rent this and see if you have the same problem. I would recommend anyway getting an SLM and setting the levels up properly if you have not already done so, then try it again.

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