i know if you wire two 8ohm subs parallelyou get a 4ohm load. I have also heard that when you bridge and amplifier it cuts the ohms in half. So if you wire two 8ohm subs in parallel can you bridge them to the amp or will this be equal to a 2ohm load and not work.

Also, when wiring speakers in parallel should both subs connect directly to the amp or should the +'s and -'s of the subs be wired together and only one sub wired directly to the amp

Any advise would help

 

Two 8 ohm subs wired in parallel will yield a 4 ohm load. The amplifier will put out power levels identical to a 2 ohm stereo load but into a single channel. Although many people do say that a 4 ohm mono load is halved this is not physically the case. The load is still 4 ohm but when the amp is ran in mono mode the amp the voltage on the rails increases and it will then generate more heat and only be safe running to a 4 ohm load if the amp is 2 ohm stable. In order to keep from going in depth many people just say it halves the impedance. For all intents and purposes when an amplifier is rated it is done at specific voltage and no means of wiring or other magical fix will change the fact that the amp will produce x amount of power and no more regardless of impedance. There are some amps out there that will run into even lower impedances but these are your high current amps and are typically more expensive.

Anyway, it is perfectly safe to run 99% of the amps out on the market today into a 2 ohm stereo load or a 4 ohm mono load so it should be safe operating limits for yours as well but be sure to check your owners manual to be sure. Now, as for wiring your subs I would suggest that you run each sub directly to the amps terminals just for best distribution of power. If you have ever experimented with wiring multiple light bulbs in a parallel configuration you will notice that the one closest to the power source burns brightest. The same would also hold true with your subs. So although the difference in power to each of the subs would be relatively close the perfect matchup would be to wire both subs directly to the amp using the same length of wire for each sub.

Hope this helps but if you need any more info just ask.

 

Thanks,
That's what i needed to know. My amp is rated at
4§Ù Load Per Channel 50 Watts x 2
2§Ù Load Per Channel 100 Watts x 2
4§Ù Load Bridged (Mono) 200 Watts x 1

so everything should workout right?

 

Yes, it will work out great with the 2, 8 ohm subs in parallel and the amp in bridged mode. Which will give you the 4 ohm mono load you want and average out to 100 watts per sub with the specs you provided.

 

thanks for the help