Sine wave testing on sub(s)

jol50 · 12th January 2008, 07:29 PM

Has anyone played with this? I never got around to it, but now I have a test CD and a CD HU to test with and was playing it on a sub. I changed to a smaller sub amp from a 150x2rms; a 190rms x1 bazooka ELA1190, but was running it on a battery at ~12.6V idle. The box is tuned around 35hz ported, it is a 10" 400w audiobahn clone. What I get with the smaller amp is under about 35Hz when I turn it up I also get a 40Hz tone at louder volumes. It may have been clipping as it was warm and on 12V. At 40 and up it did not do this. It has a 20Hz subsonic that seems to work. Is the amp getting some kind of harmonic or the box? I will play a larger amp again, don't recall it sounding that way but did not check it as well. The box is a qlogic 1cf but mounted the sub inverted and it is near factory specs for minimum size, looks ok on winISD. It shows -3db at 32Hz. Put a little stuffing in there too.

aznboi3644 · 13th January 2008, 02:05 AM

What are you asking exactly??

be specific...your post is like trying to solve a puzzle

I use test tones all the time for setting up amps and what not though

jol50 · 13th January 2008, 03:59 AM

Have you heard this secondary tone and maybe know if the amp is making it and why, the 40Hz I hear below 40 and only at higher volume.

aznboi3644 · 14th January 2008, 06:10 AM

that noise is feedback coming from somewhere.

try running an 18 gauge wire grounding the head unit chassis to the amplifier chassis

12th January 2008, 07:29 PM	#1
jol50 diyAudio Member Join Date: Nov 2007	Sine wave testing on sub(s) Has anyone played with this? I never got around to it, but now I have a test CD and a CD HU to test with and was playing it on a sub. I changed to a smaller sub amp from a 150x2rms; a 190rms x1 bazooka ELA1190, but was running it on a battery at ~12.6V idle. The box is tuned around 35hz ported, it is a 10" 400w audiobahn clone. What I get with the smaller amp is under about 35Hz when I turn it up I also get a 40Hz tone at louder volumes. It may have been clipping as it was warm and on 12V. At 40 and up it did not do this. It has a 20Hz subsonic that seems to work. Is the amp getting some kind of harmonic or the box? I will play a larger amp again, don't recall it sounding that way but did not check it as well. The box is a qlogic 1cf but mounted the sub inverted and it is near factory specs for minimum size, looks ok on winISD. It shows -3db at 32Hz. Put a little stuffing in there too.

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13th January 2008, 02:05 AM	#2
aznboi3644 diyAudio Member Join Date: Dec 2007	What are you asking exactly?? be specific...your post is like trying to solve a puzzle I use test tones all the time for setting up amps and what not though

13th January 2008, 03:59 AM	#3
jol50 diyAudio Member Join Date: Nov 2007	Have you heard this secondary tone and maybe know if the amp is making it and why, the 40Hz I hear below 40 and only at higher volume.

14th January 2008, 06:10 AM	#4
aznboi3644 diyAudio Member Join Date: Dec 2007	that noise is feedback coming from somewhere. try running an 18 gauge wire grounding the head unit chassis to the amplifier chassis

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