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When you say flat you mean.....

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Brad_Porter

Guest
I was reading Jase's mini review on his new Velodyne sub and I hear people asking questions like 'is it as flat as your last sub' etc.

What exactly does 'flat' mean?

Jeez. Have I got a lot to learn. ;)
 
B

Brad_Porter

Guest
Jase - (Hows it going by the way? Cool I hope?)

But what does it all mean! There are guys there with peaks and dips and mountain like pictures! Whats the idea? To get a flat line on the graph?? When theres a peak or a dip, what does that sound like if you are in the room?

Sigh.
 

Ian J

Banned
With respect to jase, that thread will confuse most people.

Flat means that the output in decibels will be constant over the whole frequency range.

Most subs if not correctly set up will output +2Db at 35Hz and -1 at 30Hz and -6Db at 20Hz (just matematical examples & not real figures)
 

Ian J

Banned
Originally posted by Brad_Porter
But what does it all mean! There are guys there with peaks and dips and mountain like pictures! Whats the idea? To get a flat line on the graph?? When theres a peak or a dip, what does that sound like if you are in the room?

Mine has peaks and troughs all over the place and sounds great. If you have a highly trained ear you may notice something but not the average punter.

You can do something to flatten it out by moving the sub around and retesting but many of us can't do that as there aren't always options in a room about where to park such a large beast.
 

Jase

Distinguished Member
Fine here.:)

A peak means that the room/sub or both is boosting that particular frequency whereas a dip means you have a drop off at that frequency. Ideally you would have a flattish response so that the overall bass sound is smoother.

A peak would mean that you´ll be hearing more of that frequency and overpowering the rest of the frequency range.

Bear in mind that if the sub sounds good to you and your ears it doesn´t matter what the graph looks like. As long as you´re happy with the sound.:)
 
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Couch Potato

Guest
Then you could always confuse the situation by not having a flat response but allow for a "room curve" :devil:

Steve
 

Dave N

Standard Member
er... but all this presumes that the listener has a "flat" hearing response - I dont know but I'd venture that this is unlikely. On the other hand perhaps it is insignificant compared to say the effects that the room (or indeed the speaker itself) has. Just a thought...
D
 
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Couch Potato

Guest
The "Flat response" refered to earlier in the thread was Jase's in room response even allowing for fluctuations due to room resonances sub placements etc. The original thread was about trying to get as near as flat a response as possible and whether it was worth investing in a Behringer Feedback Destroyer to use as a Parametric Equaliser to "flatten" out the peaks associated with room resonation, poor sub-placement (maybe through necessity, have you seen the size of Servo 15, Velodyne 15" & 18" subs and SVS subs :eek: )

I seriously doubt anything other than Whales or Elephants could hear the output of an HGS 18..... and it appears to be pretty much flat to 12Hz!!

Steve
 

Nobber22

Well-known Member
Originally posted by Couch Potato
I seriously doubt anything other than Whales or Elephants could hear the output of an HGS 18..... and it appears to be pretty much flat to 12Hz!!

Steve

Excellant! I'll take one along on my next whaling & hunting 'Last-minute.com' holiday in the Fall.
 

Jase

Distinguished Member
Originally posted by Couch Potato

I seriously doubt anything other than Whales or Elephants could hear the output of an HGS 18..... and it appears to be pretty much flat to 12Hz!!


You don´t hear it you feel it! As does anyone in a two mile vicinity.:D
 
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Couch Potato

Guest
Originally posted by Jase


You don´t hear it you feel it! As does anyone in a two mile vicinity.:D

I know, when I was measuring the output of my SVS my trousers were flapping but there was barely a noise (well from the sub at least, everything else in the room was rattling, in fact there were parts of the room rattling I didn't know I had!!)

Steve
 

Steve.EX

Active Member
I can confirm that whilst obviously not "flat" my 2 servo's will play 15hz at approx 3db down from 20hz which may or may not be attributable to my (awful) 4mx4.5mx4m (W.L.H) room, still scary stuff at greater than 90db though!!!

Steve.
 

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