Amp gain make sub flex in and out with distortion HELP??

[jdubbau 10+ year member]

I have a Epic 160 hooked up with a AB 700.1 that I have hooked up at only 4 ohms and when I turn the gain above half way the subwoofer is barley moving then starts just flexing in and out and distorting? I have tried changing everything I can and it is still messing up.

What is the deal???

Help please?

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[jdubbau 10+ year member]

Oh I also have a major hum noise that stays if the epic 160 is active.

 

[jdubbau 10+ year member]

Any ideas guys?

Does anyone think it may be a ground loop issue?

 

[csu87 10+ year member]

check your wiring. it sounds like a grounding issue

 

[jdubbau 10+ year member]

This is a link to the epic 160 manual as a few seem to think it may be a ground issue and this piece of equipment is able to change from isolated to 200ohm or ground for the grounding options and balanced and unbalanced on the RCA's. However I JUST DONT GET IT as it just shows dots that are all different and the manual does not really explain it fully as far as how to jumper or switch it over. I ASSUME it is saying to connect wires from one input or output to another to switch certain features. HOWEVER I JUST DONT GET IT.

SOMEONE PLEASE HELP THIS DUMMY OUT!!

http://rs.audiocontrol.com/company_38//Epic-160%20Manual.pdf

 

[bigaudiofanati2 10+ year member]

Is your loud off and your bass boost off also your sub woofer at 0 "on the head unit'? Sounds like the amp is amplifying a noise coming threw the wired OR something could be wrong internally.

 

[jdubbau 10+ year member]

I have tried all that to per the manual but it just DECREASED the bass humming noise and I could turn the gain just a TAD bit more high but still the same result.

Currently I have it wired this way.

Power is Batter + single dedicated wire to AC160, Ground is Battery - single dedicated wire to AC160, Remote is attatched to ACC wire that goes to indash DVD player/reciever with jumper to illumination from remote with ACC line.

Hopefully this will help knowing this too?

 

[jdubbau 10+ year member]

Found out the switches are INSIDE of the EPIC 160 which is WHY it has to be OFF to take the cover off and change the switch positions according to the lableing on the top of the unit. That was the only thing that made sense to me.

I will try that and see if it is any help as I can switch from Balanced to Unbalanced on outputs as I definatley do not have balanced output that I know of. May be some of the issue????

 

[PaulD 10+ year member]

do you have a ported box ? If so you need to get rid of the epic.

Explanation: IF the box is ported it is usually tuned to around 35 Hz, that means if the sub is asked to play frequencies much below the tuning freq, the sub is unloaded. It would be the same as holding the sub up in free air with no box. This will cause the sub to flex viloently with vey little power appied. The purpose of the Epic is to "create" bass frequencies, I will explain the old epicenter since I know the frequencies for it. On the epicenter, it looks at freqs between 50-100 Hz and creates a duplicate freq at 1/2 the original (whether it belongs there or not). Example - it see's a 64 Hz Freq and recreates a 32 Hz frequency. Ths Epic will create a constant stream of freq's your sub/box is not designed to reproduce.

According to the manual, try setting the inputs to ungrounded as well. Some combination of input grounding and ground isolation jumpers should give you noise free operation. As far as being ignorant, we ALL started this hobby knowing absolutely nothing. You just have to be willing to learn.