Trying to understand amp ohms.

 

New member
Username: Shopvac

Post Number: 10
Registered: Jun-10
Lets say I have a 1 chnnel amp, with the following RMS ratings..and want to run a single sub. dual 2 ohm

4 ohms: 500 watts x 1 chan.
2 ohms: 1000 watts x 1 chan.
1 ohms: 1500 watts x 1 chan

now they are two pair of speaker terminal on the amp, (+,-), (+,-)
like wise two pairs on the sub for each voice coil

If I connect one voice coil to one speaker terminal, and like wise the other voice coil to the other speaker terminal, I would get 1500 watts RMS at 1 ohm load, am I correct?

A few questons, just to understand:
1 What RMS would I get if I connect a 1 ohm load to one pair of speaker terminal on the amp?
2What RMS would I get if I connect a 2 ohm load to one pair of speaker terminal on the amp?
3 What RMS would I get if I connect a 4 ohm load to one pair of speaker terminal on the amp?

What I am trying to determine is how the power is distributed from the 2 pairs of speaker terminals on the amp.

Please keep in mind the amp is not bridgable.

I would look at bridgable amps another day ..lol..

Thanks.
 

Silver Member
Username: M_kimmel843

Post Number: 147
Registered: Apr-10
The amp is "bridged" internally. They give you two sets of terminals as a convenience. This way you don't have to wrap the speaker wires together and what not. If you want a one ohm load, then yes you can run each voice coil to each set of inputs because when doing this the inputs like I said, will be internally bridge.
 

Bronze Member
Username: Shopvac

Post Number: 12
Registered: Jun-10
Thanks Matt
 

Platinum Member
Username: Insearchofbass

2 hifonics 2607s, 2dcSounds12xls SPL\idmax12SQ

Post Number: 14632
Registered: Jun-04
by the way welcome to ecoustics
 

Bronze Member
Username: Shopvac

Post Number: 13
Registered: Jun-10
Thanks Sean, glad to be here!
 

Platinum Member
Username: Glasswolf

Post Number: 13836
Registered: Dec-03
actually monoblock amps aren't bridged at all. they don't have two channels (even internally) to bridge.
bridging implies inverting one channel in a push-pull type of setup. head units use an internal bridging model to get their 8-12 watts per channel from the internal amplification circuit without the use of a transformer. That's why head units can't do lower than a 4 ohm load per channel.
Mono amps are simply a single amplifier channel (one pos, one neg.)

If your amp is:
4 ohms: 500 watts x 1 chan.
2 ohms: 1000 watts x 1 chan.
1 ohms: 1500 watts x 1 chan

this tells me that:
*the amp has an unregulated, or very loosely regulated power supply.
*the amp is either output regulated below 2 ohms, or the power supply isn't sufficient to redouble power output going from 2 to 1 ohm loads, which means it's a cheap amplifier, or uses cheap internals.
 

Bronze Member
Username: Shopvac

Post Number: 19
Registered: Jun-10
Thanks Glasswolf, that makes sense. It's actually a Hifonics HFi1500D and was just using it for reference.

Which mono amp would you recommend between 1200 -1500 Watts RMS with a budget $350 max?

I am looking at the AQ1200D http://www.audioque.com/aq/?page_id=26

Thanks.
 

Platinum Member
Username: Glasswolf

Post Number: 13842
Registered: Dec-03
Sundown, maybe?
 

Bronze Member
Username: Shopvac

Post Number: 20
Registered: Jun-10
Sundown would be great, Which one would you recommend to drive a single 12'' fi Q 1000 watts RMS handling and where can I purchase it?

A link would be appreciated very much.

Thanks,
ShopVac
 

Bronze Member
Username: Shopvac

Post Number: 21
Registered: Jun-10
Would the SAZ-1000D be enough? ....its going for $315 at SSa
 

Silver Member
Username: Jbpitt

Pittsburgh, Pa. Usa

Post Number: 536
Registered: Jul-09
Thats definatly a nice amp,what sub/subs are you going to be running?
 

Silver Member
Username: M_kimmel843

Post Number: 166
Registered: Apr-10
He said a single FI Q. What ohm is the Q, dual 2 or dual 1? If it is a dual 2 then yes, the SAZ-1000d @ 1 ohm would be a great choice for an amplifier.
 

Bronze Member
Username: Shopvac

Post Number: 22
Registered: Jun-10
Yes Matt it's a dual 2 ohm, was just wondering if I should get a little more power...
 

Silver Member
Username: Jbpitt

Pittsburgh, Pa. Usa

Post Number: 543
Registered: Jul-09
That amp will be fine,but if you have the extra cash you could always get something bigger in case of a future upgrade.
 

Bronze Member
Username: Shopvac

Post Number: 24
Registered: Jun-10
Thanks guys..
 

Silver Member
Username: M_kimmel843

Post Number: 167
Registered: Apr-10
Sean P. is correct. Also, your welcome.
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