hey guys i just recently installed a new amp
http://www.jbl.com/EN-CA/Products/Pa...px?PID=GTO7001
and the bass on the subs is way tooooo low like barely there.

method which i used to wire.
http://www.the12volt.com/caraudio/wo...1&I=42#results. (2 ohms)

subs which i have
http://www.crutchfield.com/S-HVn9GYz...JH4510-04.html

[B]i also tried these wiring methods and same problem actually the bass is even weaker http://www.the12volt.com/caraudio/wo...2&I=42#results

amp that i used to power the subs before
http://www.jbl.com/EN-CA/Products/Pa...px?PID=GTO1004 the bass hit much better then with the new amp which makes no sense to me

what solutions could there be someone please help

 

by the way the head unit is http://www.crutchfield.com/S-4aJfsGF...fo#details-tab

 

signal issue, check your gains.

 

or take it to a local shop .. leave it to the pros unless youre 100% on car installs.

 

Nice equipment. problem is how your wireing the new amp. you have DVC 4ohm, 1 sub is like having 2 because of the voice coil. the amp can't handle a 1/2ohm load (parallel wire + to +) so you need to get creative. wire to the sub in parallel and the second voice coil in series (+ to -) this will stablize the load to 4ohms. the amp will run way cooler and provide the power your looking for. so to recap run + to + on one voice coil than - to + from one voice coil to the next and - to - to the amp. now if your running 2 subs this way that amp will not handle it. go back to the 4 channel amp, or add a second 700w mono.

 

<a href="http://slimber.com/index.php?image=speaker.g124555" title="speaker"><img title="speaker" src="http://slimber.com/gallery/pictures2/12/124555/speaker.jpg"/></a>

Do not understand the amplifier to speaker wiring. Why is the above not suitable?

 

Maybe check the settings. On my pioneer deck it has a "subwoofer" option. Check if it's turned on. It might be on and set in a negative setting(mine goes to negative 5, which let's almost no bass out)

 

when doing it this was it keeps going down to a 1 ohm for some reason

 

when i tested the subs they were at 3.5 instead of 4ohm i dont know why that is

 

i did that it it did not any difference

 

how come the 4 channel can handle it and not the mono even do the mono is more powerfull

 

your amp is mono. it only has 1 chanel. 1 chanel at 4ohms x 700w. if you hook one speaker to the chanel the amp sees 4ohms, if you hook another speaker to the same chanel it sees 1/2 the ohm rateing. so each 4 ohm voice coil you add it cuts the ohms in half. 4ohm dvc wired the way you describe the amp sees 2 ohms per speaker, so 2 DVC subs = 1ohm. now each time the ohm rating goes down the wattage increases by 33%-66%, and needs more power to provide the extra wattage. if i ran this system the power wire would be a 0 gage wire going to a fuse block (40-60 amp fuse depending on the amp mfg recomendation) than 4 gage to the amp. any size smaller the amp is starving for power.speaker cable size is another big part you should be running a 12-14 gage wire to the sub, anything smaller your starving the sub.

 

realy both amps are rated in china watts. true watts are what the mfg'sback in the day were.

 

^this... I have a stack of Old School Memphis and Rockford amps to repair.

 

Based on the link its a SVC 4 ohm sub. So first off we need to confirm that fact.

Is everything else in the install the same as before? Same radio, same enclosure? Have you checked the voltage at the amp? Maybe you got a bad ground? Got guess till we get more facts.

 

Ok at the back of the subs it said its 4 ohm dvc. The rms is 300 not as its stated on fhe website. Everything is the sane as before except the amp

 

so if i use a 0 gage it will work ( i have a 4gage atm)? because the amp is 700watts at 2ohms, 425 at 4omhs. also it has 4 connections ? now i am not sure if it is capable of supporting 1 ohm. which way should i wire them. i tried wiring it separately at 2 ohms and connecting them individually but still didnt work.
http://www.google.ca/imgres?imgurl=h...9QEwBQ&dur=580
here is what i mean by 4 connections

 

Whats up with a mono amp having TWO speaker outputs? Weird... but according the manual you can use either. But I bet that means you can't use BOTH! It claims a 2 ohm minimum load total, so it will NOT run at 1 ohm.

Now these subs are DVC 4 ohms, so they can be wired individually to either 2 ohms or 8 ohms. Then once wired together back at the amp that is either 4 ohms or 1 ohms. Neither configuration is optimal for that amp since it wants 2 ohms

I would wire everything to 4 ohms, so you talking 425 watts or 212 per sub, this way: http://m.seimg.net/product/img/subwo...variation1.jpg

Your old amp running at 2 ohms would have been 150 watts per sub, so there should be a slight difference, but the bass level should not have gone DOWN

After wiring as the link above shows I would double check the crossover and DBO bass setting per the JBL manual. 4 gauge wire should be enough for this amp, 0 gauge is overkill: http://knowledge.sonicelectronix.com...amplifier.html I'd also check the ground connection, it should be same gauge as the power wire and to a clean, solid piece of metal on car's chassis. What voltage level do you have at the amp? Should be between 12 and 14 volts, higher being better of course, check with the engine running too.

 

Thanks man i will try that tonight afterwork. Hopefully it works. The ground is the same. The voltage i am not sure

 

Although mono amps have 4 speaker outputs, internally the pos and neg are connected. This is done to offer easier wiring options with the different ohm load configurations.