feeding 120rms to a 300rms sub?

[DIGIDIGIBOMBO 10+ year member]

Hi, Is this considered a weak amp? my amp can output 120rms bridged and i am using a 300rms sub, the guy at the shop is telling me that i can put a bigger sub for more power, but i think that the problem is in the amp right? how can i have more power by using a 400rms sub if my amp will only output 120rms, i ask him this and he keeps on telling me that the amp is big enough for the sub:S:S:S

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[MrWizzard 10+ year member]

LOL... you're right, you'll need a bigger amp for more power. It all depends what you think is loud. i would just put 300 rms into the sub or more though.

 

[luvinthebass 5,000+ posts]

LOL... you're right, you'll need a bigger amp for more power. It all depends what you think is loud. i would just put 300 rms into the sub or more though.

300 rms should be plenty, just watch the gain on the amp. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[DIGIDIGIBOMBO 10+ year member]

Thx guys, i also folowed the gain tutorial, to have 120rms bridged for a 4 ohms sub i must output 21.9Volts( i used a 45 Hz test tone etc...) and the sub was barely moving, i then set it by ear and results were great and no distorion( i used the test tone cd again just to see what was the voltage, and i got 45 VOLTS!!) so i am outputing 500rms without any clipping how is that? now i am always setting gains by ear, cranking gains up till distortion and then lower a bit.

 

[tRiGgEr 5,000+ posts]

Thx guys, i also folowed the gain tutorial, to have 120rms bridged for a 4 ohms sub i must output 21.9Volts( i used a 45 Hz test tone etc...) and the sub was barely moving, i then set it by ear and results were great and no distorion( i used the test tone cd again just to see what was the voltage, and i got 45 VOLTS!!) so i am outputing 500rms without any clipping how is that? now i am always setting gains by ear, cranking gains up till distortion and then lower a bit.

You are clipping it. Just because "you" can't hear the distortion does not meen it is not clipping. If you leave it like that you will eventually blow it. If it is not loud enough properlly set get a bigger amp to match the subs RMS power...

 

[DIGIDIGIBOMBO 10+ year member]

By the way , when i am using the test tone cd i am measuring the voltage after setting the frequency and turning on the built in cross-over, i read somewhere that the built in crossover must be turned off when setting the voltage and gain, and then turned on , i cant see the logic behind it, after setting everything we then turn on the crossover( so we might go into clipping by doing so), true? thx again

 

[tRiGgEr 5,000+ posts]

No.

Having the gain to high is what causes clipping... Not a crossover...