noise, amp problem

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5kwatts

Member - Posts: 27

Joined: December 21, 2006

Location: Ohio, United States

Posted: November 03, 2007 at 11:27 AM / IP Logged

i got two 15's audiopipe speakers and a 2000watt pyrmid amp and when i start my truck theres a humming noise comming from the subs and when i give the truck gas the noise gets a higher pitch i checked all of the wiring and seems to be all correct..............also i have the amp bridged at a 2ohm load and its stable at 2ohms and i cant turn my gain or bass up passed 1/4 or it will go into protection mode any ideas ???? thanks

DYohn

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Joined: April 22, 2003

Location: Arizona, United States

Posted: November 03, 2007 at 12:53 PM / IP Logged

Your noise issue sounds like a bad ground. Read the grounding sticky posts. Your gain should be set to match the output from your head unit. Is it?

Pyramid is door-stop-quality trash, so it is also possible you are expecting more out of it than it can give. 2000 Pyramid watts = about 200 real watts.

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sarcomax

Copper - Posts: 276

Joined: November 09, 2005

Location: California, United States

Posted: November 03, 2007 at 12:56 PM / IP Logged

usually when you get an alternator hum through your subs the amp ground is bad, the amp is bad (pyramids are cool as long as they house mummys in egypt, un cool if they are in a car...read not the highest of quality) and since it is usually a high pitch noise, it sounds like your amp settings are all wrong. Are you bridging a 2ohm load? if so the amp is seeing a 1 ohm load. I don't know exactly what 1/4 is on your amp. you can't effectivly set gains by where on the dial you are turning it to.

csnut18

Copper - Posts: 196

Joined: January 27, 2007

Location: United States

Posted: November 03, 2007 at 1:10 PM / IP Logged

Why don't you just buy a good quality brand? They really don't cost that much these days.

5kwatts

Member - Posts: 27

Joined: December 21, 2006

Location: Ohio, United States

Posted: November 03, 2007 at 3:06 PM / IP Logged

yea i kinda figured it was the amp i moved the ground a few times and its still making the noise......also i was wondering is it safe to get a 3000watt amp and run it with my 15s??? they are 2000watt maxx each but are only 1000rms

i am an idiot

Platinum - Posts: 13,667

This member consistently provides reliable information

Joined: September 21, 2006

Location: Louisiana, United States

Posted: November 03, 2007 at 3:41 PM / IP Logged

Sounds a LOT like a pioneer head unit. Is it?

5kwatts

Member - Posts: 27

Joined: December 21, 2006

Location: Ohio, United States

Posted: November 04, 2007 at 11:09 AM / IP Logged

yes it is......is that why i am getting this problem??

techman93

Silver - Posts: 591

Joined: October 28, 2006

Location: Pennsylvania, United States

Posted: November 04, 2007 at 12:40 PM / IP Logged

There have been many posts on here about Pioneer RCA ground issues. You will need to ground the outer part of RCA to the same ground that your radio is hooked up to. That should take the hum away. I do agree with past posters that Pyramid amps are not high end and they exaggerate the wattage they produce. I would save up some cash and buy a better amp with a cleaner output.

i am an idiot

Platinum - Posts: 13,667

Joined: September 21, 2006

Location: Louisiana, United States

Posted: November 04, 2007 at 6:40 PM / IP Logged

It is a very good chance that your pioneer radio has lost it's ground reference on the RCA cable. To see if this is your problem you will need a short length of 18Ga. wire. Strip both ends of the wire attatch one end to a good ground. And touch the other end to the outer part of the RCA cable. The shiny metal piece that you can see when the cable is plugged into the radio. It should make a pop noise and then the noise should go away. If this fixes your problem you can solder the wire to the RCA cable and problem solved.

5kwatts

Member - Posts: 27

Joined: December 21, 2006

Location: Ohio, United States

Posted: November 04, 2007 at 7:26 PM / IP Logged

should this fix my problem with my gain and bass controls on the amp???

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