To be honest with you I know little about car stereos, but my friend that was helping me knew a lot. We installed 3 10' MTX and a 750 watt MTX amp. WELL the subs will hit but then it cuts out, and won't play all of the bass. We didn't connect the remote wire, but he did a trick that would make it work like it was. It still doesn't work, and now I'm stuck with dead weight in my trunk b/c the subs aren't worth listening to b/c they aren't hitting right. When they did hit it sounded great, but does anybody know how to fix this problem?

-payne-

 

how do you have them wired? maybe you have a impedence mismatch causing the amp to overload. If you have the three subs in parrallel into the amp on one channel, you may have them at a 1.3ohm load, going into a 4ohm amp. That could do it to ya.

 

how did he connect the input? it amy be to high and the amp cant handle the input .And the ohms dont realty matter unless your amp has less ohms than the speakers.

 

huh??????? ohms don't matter??? If the amp is rated for 4ohm stable and you have a 1.3ohm load on it, you can blow your amp. How do ohms not matter?

 

you dont understand what ohms is , its resistance . Also the amp is the load so the only thing that can happen if you have a 4ohm and with 1.3 ohm speakers is your speakers wont push to the full power.

 

I think you got that a little messed up. The speakers are the load on the amp, not the other way around. Also, the ohms of the speaker is NOT the resistance. It is the impedence. As for as me not knowing what ohms is....I think my Associates Degree in electronics would say otherwise. I've been doing this for years. If that amp is only 4ohm stable, a 1.3ohm load CAN blow the amp. This is why some amps have an overload protection circuit. Sorry I seem a little defensive, but I do not like being told that I don't what i'm talking about.

 

Payne, try hooking the subs up in series. This will change the load from 1.3ohms to 12ohms. you won't push to full power that way, but it will tell you if the 1.3ohm load is too much. If it works better that way, you can try putting two parrallel(2ohms) and run the two in series to the 3rd(4ohms). That will give you a 6ohm load and give you the closest impedence match. I'm not sure how it will sound that way(never tried series and parrallel myself), but it may do the trick. Good luck.

series:

amp speaker1 speaker2 speaker3 amp
(+)-->(+)(-)-->(+)(-)-->(+)(-)-->(-)
4ohm/ 4ohm/ 4ohm
<-------------12ohm------------>

series/parrallel:

amp speakers1+2 speaker3 amp
(+)-->(+)s1(-)-->(+)(-)-->(-)
........(+)s2(-)
2ohm/4ohm
<----------6ohm---------->

 

I'm gonna have to agree w/ erty67. Are the sub the one w/ 3 10's in a single box, or did you buy all 3 subs seperately? If it's the 3 10's in 1 box, then the impedence should be 4 ohms.

 

It is 3 tens in one box...i'll try working on it again tomorrow and see if anything works.

 

I dont know hu gave you that degree cause your a dumba$$

 

Please go talk to someone who knows what they are talking about, so they can teach you a lesson or two. I'll stick with hooking up systems that work, while you blow up other peoples sh**. I was doing this when you were still wetting the bed, so I won't take your dumba$$ comment to heart.

Payne, sorry bout the dispute on your thread.

 

looks like I'm not the only one that disagrees with your statement. Read the nice speaker impedance writeups below....

http://www.theshop.net/lihr/AmpFAQ/a...r%20impedance?

http://www.jvcuae.com/faq-audio.asp#8

http://www.epanorama.net/documents/a...impedance.html

...still think speakers are measured in resistance????

this one is my favorite. read the 2nd paragraph.....

http://www.mrgearhead.net/faq/ext.html

the 2nd sentence is a good one "The load plugged into the amp should never go below the minimum impedance or serious damage may occur to the amplifier."

 

yeah, um, i'm the dude that wired his subs (logged in on my friends sn). The input is fine, and i didn't touch the wires inside the box since he bought it used. So, anyway, me and my friend (also an associates in electronics) were discussing it and he suggested wiring in series, so i think you are right other associates degree dude.

 

just a lil FYI, im sure if u have an A.S. degree in electronics u should know this....but most people wont: there is a difference between Impedence and Resistance. Impedence is a measure of resistance in alternating current (AC) and resistance is measured in a DC (direct current) circuit. be careful with this. a cars electrical system is DC, while the signal going to the speakers is AC. be extremely careful when wiring subs in parallel down to 1ohm, as frequency drops, so does the impedence so be careful with subs.

 

good point I think we may be past that though. none the less, good looking out!

 

I sure hope this kid listened to the electrical lectures in here. Otherwise he will be starting fires in someone's trunk!