1200 - 1800 Bridged @ 4 Ohms: Options?

[jeremiah 10+ year member]

What are my options as far as multi-channel amps that put out anywhere from 1200 to 1800 bridged @ 4 Ohms?
I was looking at the Soundstream 1400.2, but want to know what my options would be. Budget would be around 400 or so.

No, I don't want to switch to 2 ohms or 1 ohm because I already have my woofers bought (2-MJ-18 8 ohm:yumyum: )

Y did you get the SVC8ohms?

 

[jeremiah 10+ year member]

..........................................?

WTF bad post?

 

[JonJT 10+ year member]

I'm guessing you have not had formal education in the electricity and magnetism side of physics so I'm just going to tell you straight up.

Current=(volts/resistance) and power=(volts)^2/resistance. These formulas should be used for dirrect current only, but equivalent relations for alternating current are far more complicated (involving trig identities) and these formulas are "close enough"

Now, these forumlas will tell you that voltage and amperage will differ depending on the load (ohmn rating) but the quantity VA (volt*amps) will always be the same.

For those of you in the know, I do realize that the voltage and amperage waves could and probably are out of phase by some degree, but I really don't want to get into an long winded explination to prove myself in this thread

Now, since the power is the same, you MUST look at the efficiency of the woofer to see how loud it will be for a given input of power. Woofers that are rated properly will have an efficiency rating with db/watt as the units. Testing voltages are as follows:

8ohms: 2.828 volts

4ohms: 2. volts

2ohms: 1.414 volts

A woofer with the aformentioned ohm rating must be fed the proper voltage for the sensitivity rating to be correct. If this process was done correctly then the ohmn rating really has no bearing on how loud the woofer will play therefore, you need only worry about ohm rating when you pick the amp you want.

I stand by my assertion that 100 watts into 8 ohmns is exactly the same as 100 watts into 4 ohms no matter the woofer. The voice coils will all carry the exact same amount (approx, we are dealing with AC electricity here) of power, the loudness of the woofer depends on (among a lot of other things) the efficiency of the system.

 

[AAckley1 10+ year member]

thanks, i was just going off what I had searched like most asshats around here yell at people for not doing.

Jeremiah it has already been explained, I got the 8 ohm because they were out of 4 ohm at the time and because I was under the impression that 8 ohm speakers took less power to get loud than 4 ohm speakers because I had read it previously on this forum, stated by more than one person.

 

[JonJT 10+ year member]

thanks, i was just going off what I had searched like most asshats around here yell at people for not doing.
Jeremiah it has already been explained, I got the 8 ohm because they were out of 4 ohm at the time and because I was under the impression that 8 ohm speakers took less power to get loud than 4 ohm speakers because I had read it previously on this forum, stated by more than one person.

Its no problem. A word of advice, do your own research until you are 100% you understand the question at hand. This place is full of ignorance and it can be hard to find correct information. And, you already know where incorrect information can get you.

 

[helotaxi 5,000+ posts]

BTW...looked up the PG Tantrum 1200, it only does rated power at 14.4 volts? at 12.5 it puts out 250 watts?

That is a rating thing, not a reality thing. Its 12V power is GROSSLY underrated.