constant thump from subs
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=74378
Printed Date: April 20, 2024 at 7:00 AM
Topic: constant thump from subs
Posted By: d_stever
Subject: constant thump from subs
Date Posted: March 12, 2006 at 10:54 PM
i have two(2) 15" volfenhag subs(zx4715dvc) a pyle 1000 watt amp(pla885)and a pioneer cd player(deh-p2600), when ever i turn the volume down on the deck, or turn the gain on the amp up to far i get this loud "thump" from the subs about every secound or sothe deck i bought from a friend witch i installed for him and he didnt have a problem,the amp and subs are new the car is a '89 sundance, any help with this would be helpful -thanks
Replies:
Posted By: DYohn
Date Posted: March 13, 2006 at 1:20 AM
PLEASE use the SEARCH function on the top of this forum and look for "setting gain." Your gain control is not a volume control, it needs to be set to match your head unit and left ALONE. Or better yet, go get help from a professional installer and once the system level is set, don't mess with it! ------------- Support the12volt.com
Posted By: d_stever
Date Posted: March 15, 2006 at 10:56 PM
i should say when i turn the gain above 25%it thumps its worse when the amp has no siginal going to it(when im changing cds or i turn it to radio or cd) and there is no way im going to a pro to do it and get ripped off and down graded about my system and try to be sold a new one
Posted By: gbear14275
Date Posted: March 15, 2006 at 11:55 PM
No offense man, but sometimes you get what you pay for. I'm not saying that the best audio equipment is the most expensive because thats not true but I don't think i've heard many good things about a pyle amplifier. Maybe someone here will contradict me and that's fine because I don't keep current with alot of brands but the problem might lie in your amplifier itself. Bad circut design or some construction defect might be causing this problem. Someone else chirp in to tell me if im not being fair...
Posted By: kfr01
Date Posted: March 16, 2006 at 12:18 AM
d_stever wrote:
i should say when i turn the gain above 25%it thumps its worse when the amp has no siginal going to it(when im changing cds or i turn it to radio or cd) and there is no way im going to a pro to do it and get ripped off and down graded about my system and try to be sold a new one
Are you kidding me? You present a perfect case of someone that should go to a pro, and you still refuse. As DYohn stated, but you seemed to ignore, you need to learn how to set gain correctly and what it is. Read https://www.bcae1.com/ Ask questions if you need to, but please try to learn. ------------- New Project: 2003 Pathfinder
Posted By: placid warrior
Date Posted: March 16, 2006 at 1:28 AM
The only downgrading u could go from a Pyle is to Pyramid. I may be wrong but i have heard of a leaking capacitor causing this symptom as well (and if u cant find and fix it u would need a new amp anyway)
Posted By: pcguy760
Date Posted: March 16, 2006 at 3:08 AM
Well I guess I will add my 2 cents lol - I once was installing an amp for a friend and it did the same thing - it was a slow thumping and I could see the sub moving in and out BUT it only happend with the RCA cables connected. Once I disconnected the RCA Input cables it stopped. Changed to some good quality RCA cables and the thumping was gone. Another time I had this was when I had barely a good ground on the amp power side. Just my personal experiences maybe it can help you out.
Posted By: redlinecustoms
Date Posted: March 16, 2006 at 11:06 AM
As many people think, all you have to do is put the stuff in turn everything way up and bam. This is entirely WRONG. The reason a professional is needed is because there are many aspects about tuning an amp that people dont understand. There is different ways of wiring subs and amps, to get different ohm loads, or more watts, etc. If you go to a shop that tells you your system sucks, then find a new one. Any respectable shop will help you with your system, no matter what it is. Because customer service is the only way to stay alive in this business. Jack
Posted By: boug0752
Date Posted: March 17, 2006 at 9:06 PM
Hey man, This has happened to myself with a KICKER 800.2 amp with 2 VRs...obviously not a cheap setup. I had the same probably with using a defective set of RCAs. Once I changed those out it was clearing sailing for a couple years until a bass comp when I got the great scent of burnt subs in my car for a couple of weeks... ------------- If your counting pennies and dimes then maybe you shouldn't be spending every penny and dime you have!!
Posted By: kirktcashalini
Date Posted: March 17, 2006 at 9:59 PM
Happened once on my RF amp... the day i upped wire from 4 to 2 gauge.... I was confused. It was because the ground wasnt secure (i rushed it), secured ground and it went away. hope its the same thing for you... cause its a easy fix.
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99 Blazer LT. Yellow Top. Big 3. Infinity Kappa Speakers All Around. Jensen CD/DVD flip out. 2 Infinity Kappa Perfect 12DVQs powered by a Alpine PDX600.1 (in one custom box, building a FG box)
Posted By: sprawl85
Date Posted: March 17, 2006 at 11:01 PM
I too have had this happen from improper grounding. Check the resistance from the ground to your negative battery terminal. Forbidden made an awesome post https://www.the12volt.com/installbay/forum_posts.asp?tid=49445&PN=1 that should solve your problems. If it isn't that, then I am still almost positive it is a ground problem. Check the grounds on everything. And then upgrade the big three, i have seen that take care of ground noise too. OOH I got one for ya. When I had this problem before, switch the amplifier to full range, so it isn't set for subs, even if it is feeding into the subs it won't hurt them and you will probably be able to hear alternator whine, or some other type of ground noise. Trust me, grounds are really really important. ------------- fiberglass reminds me of peanut brittle... but fiberglass tastes better!
Posted By: d_stever
Date Posted: April 16, 2006 at 3:22 PM
thanks for all the help after a few weeks ive replaced the rca cables and the Y adapters and it seems to be running fine now thanks to all for the replies
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