subwoofer experts please...

Jon Slater

Grip
Joined
May 5, 2002
Messages
22

Any thoughts on this chart ? Measurements taken with my paradigm pdr-10 subwoofer only..no other speakers connected..
info on testing etc found at http://www.snapbug.ws/bfd.htm
also..am i right in thinking that when using the radio shack spl meter the subwoofer level is not correctly reported ? For example if i set all speakers to 75bd my subwoofer seems too loud..I have heard that the spl meter under reports the levels..so a reading of 75db maybe as much as 80 db..?
other posts on this subject at [url=http://www.avforums.com/frame.html?
 

Jimmy P

Stunt Coordinator
Joined
Jul 1, 2001
Messages
82
Yes the Radio shack sound meter is supposedly deficient in the lower Hz range,starting at 125Hz you add a correction factor to your readings to get actual values.

125Hz +0.5

100Hz +2.0

80Hz +1.5

63Hz +1.5

40Hz +2.5

31.5Hz +3.0

25Hz +5.0

20Hz +7.5

16Hz +11.5

12.5Hz +16.5

10Hz +20.5

Is your chart plotted with corrected values?,No matter how its plotted,you have a huge peak at 40Hz and a hole at 63Hz,you should try moving the sub to different locations to get a better response curve if your situation allows,if not you are a candidate for a BFD.Some say when useing reference noise(like receiver pink noise)if you set your speakers at 75dB, setting the sub level at 72dB is supposed to compensate for the Radio Shack meter
 

Jon Slater

Grip
Joined
May 5, 2002
Messages
22
Thanks for the replys guys..i will see if i can get a bfd in the UK..

Yes the chart is plotted using corrected values, i shall try moving the sub today and will let you know how i get on..

cheers
 

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