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Old 20th November 2011, 06:31 AM   #1
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Default Difference between dB and gain

Okay, dumb question, but I'm kinda tired of hearing all these different explanation on this subject...so I want to get your professional statements..

All about amplifiers.
What's the difference between the dB level and the gain level. It seems that I blow a lot of subs when I have my dB level turned up past 0 on my head unit...but when I have the gain turned up on my amp and my dB level on my head unit turned to 0 or below my subs hit harder. What I basically want to know is what the difference is. I keep hearing dB hurts your subs...which is what I seem to be doing recently. Thank you for your response.
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Old 20th November 2011, 06:35 AM   #2
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Are you referring to the bass boost?

If so, the bass boost increases the level only when frequencies are produced in the passband of the bass boost filter.

Abuse is what damages speakers.
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Old 20th November 2011, 06:45 AM   #3
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Umm, I don't know...just the dB on the amplifier (the one that goes from 0-10)
gain knob goes from .6v-2v
*other knobs is sub bass boost and the lpf*

I don't really abuse my subs. I just turn my music at the 20 knob (my head unit goes up to 50) and my dB is set at 0. It's becoming very frustrating...this will be the second time I've blown my subs.

Well they're not blown...but the voice coils are sounding like they are going out (a soft rattling noise when the sub hits hard)
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Last edited by carshateme; 20th November 2011 at 06:48 AM.
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Old 20th November 2011, 06:55 AM   #4
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If you are repeatedly blowing subs and the failure is not due to unsuitable enclosure or a manufacturing defect, you are very likely abusing the subs. Just because you don't use the full range of the volume control doesn't mean that you're not overdriving the subs. If the gains aren't set correctly, you could drive the amp into hard clipping with the volume set to 5 (not a typo).
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Old 20th November 2011, 06:59 AM   #5
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Well I have 4 10 in subswoofers with a rating of 800rms each...that's like 3,200rms for the whole set up and the amp gain is set at 1v *in between .6v and 2v*

the box is sealed for the recommended sealed volume for the subs.

I'm starting to wonder if it's a faulty sub..I wrote the company...the subs were a replacement subs because my first set....the drivers blew...those...I did abuse. had the dB on my head unit set at +10 and the amp dB at +10 and the gain at 1v...
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Old 20th November 2011, 07:07 AM   #6
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10dB is significant. You are almost certainly driving your amp into hard clipping.

Don't believe the power ratings on most speakers. Only the better manufacturers provide accurate power handling specs. Only use the 'RMS continuous' ratings.

Read pages 63, 69, 72 and 120 of my car audio site.
Basic Car Audio Electronics

Last edited by Perry Babin; 20th November 2011 at 07:09 AM.
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Old 20th November 2011, 07:09 AM   #7
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There is no page numbers on that website?
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Old 20th November 2011, 07:13 AM   #8
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See attached.
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Old 20th November 2011, 07:25 AM   #9
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Oh Lol I feel dumb xD
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Old 20th November 2011, 08:20 AM   #10
mr151 is offline mr151  United States
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You need to match the gain to the output signal from your hu. The gain is .6 volts to 2. volts if your hu puts out .8 volts from the rca plugs thats what the gain needs to be set at. It wont be perfect without using a o-scope but close is better than far.
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