Axiom Home Page Forums General Discussion Home Theater BFD?

The best response curve I was able to get was with a 60hz crossover setting with the sub located in the front left corner of the room about 3 feet out from the side wall and 1 foot out from the front wall.

16hz 74db
20hz 71db
25hz 67db
31.5 68 db
40hz 67
50hz 68
63hz 71
80hz 73
100hz 73
125hz 75
150 71
200 71
250 72

This is using 1/3 octave warble tones and an analog radioshack meter(adjusted measurements) positioned at the listening position at a 45 degree angle. The head unit is set in stereo mode and my Hsu sub was tuned for maximum extension.

Note: These numbers look fairly good but I noticed that when I ran the 1 hz increment test tones there was some ugly differences from one hz to the next. Some of the measurements taken with the 1/3 octave warble tones had to be estimated in the middle because the dial was traveling back and forth a significant amount on one warble tone.

I'd kill for that response!

No. Really.

Kill.

The more I look at my numbers the more I think that I could turn my sub up about 3db. Who cares if I have a peak at 16hz from 60 to 20 hz my numbers would match more of what the 60's are doing. It might actually be a flatter response that way with just that one peak.

Hmm. . .more bass. . . .hmmmm

kill.

Was away for 3 day weekend along the Oregon/California coast and just returned home late last night, so slow in a reply.

I do have the BFD set up for the twin 600s, but at the time I'm working on re-locating the subs and re-adjusting the BFD. Ken was not here for the BFD set up, and Peter was doing the programing the BFD. The person that was suppose to be the bay area sub person made most of the decisions on setting up the BFD.

There are several issues with the sub/BFD set up I have not been happy with, basically the sub gain levels were turend very low, and the set up for the subs in the C2 processor was set at -15db. So after many months of wondering why I was lacking in base, I decdided to start over and do it again.

Since I will be up at Axiom this Friday I hope to have some input from Ian on my 600s and the area they live in. The BFD can be a bit complex, but with some reading and playing, its not impossible to set up for a novice like me. lol

those response #s do look quite good, you certainly wouldn't expect as profound an effect from the BFD. Speaking from my personal experience, i did have 20db swings in response (on 1/3 octave testing). After the BFD i was able to get those swings down to less than a couple of db. That was the extent of my "scientific" testing and i did not do a lot of pre-post tests. I suppose it would be quite easy to flip the bypass on and off and test out a few specific pieces but i haven't gotten around to doing that yet. What i will say is that the overall performance of the sub has increased. To me it has been very noticeable - bass appears considerably less "sloppy", better punch, and overall output has increased. Again, i haven't performed any blind testing or anything, so take this for what it is worth, but i have noticed a marked diffference.

Those are pretty nice numbers. Your response looks like most people's "after" curves. No wonder Mark hates you.

I would agree with turning the sub up 3-4 dB.

In reply to:

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I would agree with turning the sub up 3-4 dB.

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Thanks for the responses guys. Sorry Mark!! Sorry for ever posting this! I guess I should just be happy with what I have. Rats there I go saving money again. The need is clearly more present to invest in my car audio anyway due to these wonderful axioms.

Thankun, Did you say your system was lacking in bass??

How on this green earth could YOUR system be lacking in bass?

Long story, but to solve one issue that should have been solved another way, the expert adjusted the gain(volume) control on the 600s to about a four oclock position, then more adjustement through the C2processor to the -15(adjustment is -15 to +15)....which basicaly disabled the 600s mostly. So there was lots of base, but not any where near the base that should be "felt" from the 600s.