Hey, i'm a noob when it comes to car audio, and i have an infinity ref. 300 watt mono amp running a 10" sub, and I lost all of the instructions for the amp...I want to know how do u bridge the amp, i just dont know what terminals to plug which speaker cables into...i normally just use the left set of +/-'s....i have a pic too so you could indicate which one to use...

thanks in advance

 

You can't bridge a mono amp, both sets of term. on the amp are the same, if you hook one speaker to each set of term. its the same as wiring then in parallel 94

 

ok well the box says bridgable..it also says 300 watts at 2 ohms...how do i change it to 2 ohms? instead of 4

 

If it is a mono amp, [1ch] there is nothing to bridge.
You don't do anything to the amp to make it 2 or 4 ohms, its how you wire the speakers/voice coils eg. if you have 2 subs that have 4 ohm VC and you wire the subs in parallel it is a the amp "sees" a 2 ohm load, if you wire the subs in series the amp will see an 8 ohm load.
On your amp you have 2 speaker term. if you wire one sub to each term. and they are 4 ohm VCs that is a parallel hook up and the amp will see a 2 ohm load, look here http://www.the12volt.com/default.asp? lots of good info 94

 

ok great i'm going to change the wiring on my sub..thanks for all the info

 

Actually........an amplifier has two rails and a ground. A plus rail + and a minus Rail. The plus and minus on speaker outputs don't really mean anything. Other then to makes sure phase gets handled correctly.

Usually the two center terminals are ground. The way you can tell is with a multimeter measure the impedence between the two terminals. (MAKE SURE THE AMPLIFIER IS COMPLETELY DISCONNECTED FIRST!!). If the impedence is 0 ohms then this is the shared ground plain,it's not the same type of ground as a chassis ground. You can hook the other two terminals to your speaker and this will "bridge" the amplifier.


Modified by nsxxtreme at 1:46 PM 9/12/2005

 

Ok, i'll get a multimeter and check the impedance of the terminals...thanks for the info

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nsxxtreme &raquo;</TD></TR><TR><TD CLASS="quote">Actually........an amplifier has two rails and a ground. A plus rail + and a minus Rail. The plus and minus on speaker outputs don't really mean anything. Other then to makes sure phase gets handled correctly.

Usually the two center terminals are ground. The way you can tell is with a multimeter measure the impedence between the two terminals. (MAKE SURE THE AMPLIFIER IS COMPLETELY DISCONNECTED FIRST!!). If the impedence is 0 ohms then this is the shared ground plain,it's not the same type of ground as a chassis ground. You can hook the other two terminals to your speaker and this will "bridge" the amplifier.


Modified by nsxxtreme at 1:46 PM 9/12/2005</TD></TR></TABLE> Except this is a mono amp. 94

 

I dont understand why it has 2 sets of terminals if its a mono amp..can anyone tell me that....

 

Just for convenience, there are a few mono amps out there that do that. 94

 

So do both sets of terminals have power running constant to them, ie: like its really a 2 ch?

Any ways thanks for all the help...

 

How many inputs does it have?

 

Yes they both have power, [speaker output] on them, but if the amp is a mono amp there is only 1ch., but both term. are the same, it would make no diff. if you wired 2 speakers to 1 term. or one to each term. or the speaker pos. (+) the the pos. term. on one side and the speaker neg. to the neg. term. on the other side, it would still be a parallel hook up and the ouput power of the amp would be the same. BTW, what is the make and model of the amp? 94

 

Its and infinity referance series....i think now im more confused than i was before i made this thread...

It has 2 sets of input terminals for speakers to go... like in the picture i posted

 

You mean 2 sets of OUTPUT term. for speakers, still need the model number
Go to page 3 here, it may be able to explain better.
http://manuals.harman.com/INF/...4.pdf 94

 

sorry the model number is 310a...

 

It can still have two inputs because inside the amp it is a stereo amplfier bridged I would be willing to bet.

So the two ouput terminals you see are there for convienence as previously mentioned. In other words they are connected together internally. The +,+ and -,- are connected together inside the amplifier. They just put the extra terminals there so you have an extra spot to hook the speakers up.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sooo_slow &raquo;</TD></TR><TR><TD CLASS="quote">sorry the model number is 310a...

</TD></TR></TABLE>Your amp is a mono amp, [one channel] 116W x 1 into 4 ohms or 312W x 1 into 2 ohms, it has 2 sig. inputs, [RCAs] and 2 sig. outputs, [RCA bypass] it has 1 output with 2 sets of terminals, amp info... http://manuals.harman.com/INF/...4.pdf 94

 

Yeah thanks for all the info and help guys..i think i finally understand, i wired my sub in parallel so it would achieve 2 ohms..and it sounds way better now...