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BFD experts!! Please comment on this room response...


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20 replies to this topic

#1 of 21 OFFLINE   Abhinandan

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Posted December 29 2003 - 06:38 AM

I'm planning to buy a BFD. Comment on this curve, please! I have HSU VTF-2, which is placed in one of the corners. The SPL values are compensated. The measurements are done with the main speakers off and just the sub on. I think the dip at 45Hz qualifies as a null.
The volume on my sub is at just 1.5 level. I have enough headroom to boost the overall response after EQing.
Posted Image

The compensated SPL values are:
20-->79.5
22-->89.5
25-->87.0
28-->83.0
31.5-->82.0
36-->83.5
40-->84.5
45-->77.0
50-->89.5
56-->91.0
63-->89.5
71-->86.5
80-->86.5
89-->85.5
100-->79.0
111-->79.0

#2 of 21 OFFLINE   Jason_Me

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Posted December 29 2003 - 07:33 AM

You could bring everything down to 80 db and have very flat response, though your sub will seem less powerful.

Where are all the Hsu proponents who always claim Hsu subs to have the flattest response? Posted Image I really hope this shows you how asinine those claims have been.
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#3 of 21 OFFLINE   Abhinandan

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Posted December 29 2003 - 08:10 AM

Thanks Jason, for the suggestion. --------------------------------------------------------- Where are all the Hsu proponents who always claim Hsu subs to have the flattest response? --------------------------------------------------------- I think the peaks and dips are the result of room response. The corner placement might have boosted some frequencies. Correct me if I'm wrong!

#4 of 21 OFFLINE   CurtisSC

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Posted December 29 2003 - 08:23 AM

Got to love these kind of antagonistic posts. Like Abhinandan stated, the peaks and dips are caused by the room...not by the sub. Any room would benefit from a BFD. That room curve actually does not look too bad to begin with. Have fun with that BFD.
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#5 of 21 OFFLINE   Jason_Me

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Posted December 29 2003 - 08:54 AM

Thats my point. Unless you have a room treated to the max, you will not get flat bass without EQ. An anechoicly flat sub will actually have worse in room response then a sub with a shelved response (room gain).
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#6 of 21 OFFLINE   WayneO

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Posted December 29 2003 - 09:12 AM

Which makes a flat response a nice spec on paper...........
If the best advice is "listen for yourself", then why offer your opinion?

#7 of 21 OFFLINE   Abhinandan

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Posted December 29 2003 - 09:29 AM

Anyone who can advise on EQing????

#8 of 21 OFFLINE   CurtisSC

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Posted December 29 2003 - 10:14 AM

I understand the point your trying to make. So what if Abhi's sub had an anochoic peak at 55hz, and then his room gain added to that? Let's not turn this into a sub brand X vs a sub brand Y. The bottomline is would you rather start out with a sub with a flat anechoic response or not? Abhi, I'd aim for the peak at 55hz. Have you tried moving the sub?
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#9 of 21 OFFLINE   Abhinandan

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Posted December 29 2003 - 10:30 AM

Thanks curtis! Unfortunately I don't have much space to move the sub around. As you suggested, I'll go for 55Hz peak. I want to shoot for a house curve. I'll try to flatten out the response and then go for the house curve. How about boosting the dips?

#10 of 21 OFFLINE   CurtisSC

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Posted December 29 2003 - 10:40 AM

My understanding is that the proper way is to go after the peaks first, and then see what you end up with.
curtis
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#11 of 21 OFFLINE   Wayne A. Pflughaupt

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Posted December 29 2003 - 10:45 AM

Abhinandan,
There’s really no reason to do that until you get the equalizer. Also, since you’re getting the BFD there’s no reason to experiment with different locations. That’s an exercise for folks who don’t use an equalizer. Just put it in the corner to maximize output and extension, and the EQ will take care of smoothing response. Regards, Wayne A. Pflughaupt

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#12 of 21 OFFLINE   Jason_Me

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Posted December 29 2003 - 10:58 AM

Flat anechoic is an SBB4 (super boom box) alignment. If your goal is maximum output, then thats what you want.
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#13 of 21 OFFLINE   CurtisSC

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Posted December 29 2003 - 11:19 AM

Maximum out put does not mean good bass. You may want maximum output, but others may want clean and accurate bass.
curtis
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#14 of 21 OFFLINE   Jason_Me

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Posted December 29 2003 - 12:38 PM



I think your confusing me with yourself. Posted Image
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#15 of 21 OFFLINE   CurtisSC

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Posted December 29 2003 - 12:47 PM

OK...I am a little confused at what you are trying to say. If you start with a shelved response, placing it a room will make it flat? Do you have an example of a shelved response that was made flat when placed in a room?
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#16 of 21 OFFLINE   Jason_Me

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Posted December 29 2003 - 01:08 PM

I think the guys at Adire can explain it better then me.



You'll have to check out the PDF to see the chart.

http://www.adireaudi....plications.PDF
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#17 of 21 OFFLINE   CurtisSC

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Posted December 29 2003 - 01:24 PM

Thanks Jason, I respect Adire's opinions. Dan Wiggins is a highly respected subwoofer/speaker designer, as is Hsu. But what is in that paper does not compare different subwoofers in the same location. The Hsu subs have been tested by various professional reviewers to have super flat response, that is not nonsense, it is simply a fact. Hsu also understands in detail how room interactions affect bass performance, more so than almost anybody. Dr. Hsu is considered one of the most knowledgable people when it comes to giving advice on how to properly place and set up a subwoofer in room. Hopefully we can agree that bass performance not only depends on quality of design but on room characteristics, placement options, and setup. By the way...Adire also advertises "flat anechoic response" for its subs.
curtis
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#18 of 21 OFFLINE   Jason_Me

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Posted December 29 2003 - 01:38 PM

They have different alignments for different needs. If you read the white papers you'll see the EBS (extended bass shelf) is recommended for flat in room response.
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#19 of 21 OFFLINE   CurtisSC

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Posted December 29 2003 - 02:35 PM

OK...that is fair. What is the Rava?...which seems to be Adire's top seller
curtis
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#20 of 21 OFFLINE   Zack_R

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Posted December 29 2003 - 04:07 PM

I reccomend you re-measure with your main speakers on. This will more accurately represent the type of eq adjsutment you will need.




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