I have an Orion 225 hcca that I want to wire up for my front stage. It is 0.5 ohm stereo stable. I want to wire up 3 pairs (6 four ohm speakers in total) and am wondering how many ohms the amp will see. I think it will see 1.66 ohms, is this correct?

 

Here is a good link for you: Series Parallel Speaker Impedance

 

I think its 1.33 (3 speakers per channel-4ohms divided by 3 =1.33)
I could be wrong though.
However if your running passive x-overs then this changes everything. If you have mids and tweets hooked up to a x-over it still will only have a 4ohm draw.
If you run 6 speakers (3per channel) this will still only give you 66 watts per speaker and only if the amp is running full tilt. I have one of these amps mines a G3 and I have it running 2 dvc 10's in my buddies car, it doesn't sound that good, there Orion Reds but there not in the same class as there bigger counter parts, there not that under rated.
Heres a link to the owners manual, read it, theres a few things you should know before hooking up the amp
http://www.orioncaraudio.com/Support...nual(RevB).pdf
Its the G4 manual but the G3's werer the same, and since I'm pretty sure the G1's and G2's were only 1 ohm stable you should have a G3 or a G4

 

Should end up being a 1.333 ohm load, per channel. I can't really tell, but I think you want to wire 3 speakers to each channel. If so here's what you'd end up with. You'd wire everything in parallel.

1/Total Load = 1/4 + 1/4 + 1/4 = 3/4

If 1/TL = 3/4, then TL/1 =4/3. Therefore, the Total load equals 4/3, or 1.333.

From what I can find, this amp will put out 100W x 2 @ 1ohm, since you're putting a little more resistance on it, you're output will be relatively less. 80W, perhaps. Is the 80W split between three speakers going to be the right amount of power for you?

 

Not sure what I was thinking, no thats not gonna be enough power. I currently have a MRV-T757 running 4- 4ohm 6.5" audiobahns and another old Pioneer amp running the two front Pioneer 6X8's The audiobahn speakers don't sound great to me, but I need to play with them more too. I just want it to sound loud and clean.

 

Deep six the Audioburns (out of business anyways....), then deep six the Pioneer 6x8's. Want real speakers, look to Morel and use the 6.75" component set. I stock the mounting adaptors for your F350 to make them fit. All you need is proper speakers then the right amount of power for them. Morel ® Loudspeakers

As nostalgic as the old stuff is, if it not the right application for it, do not use it.

 

This is true. In theory a high current amplifier could run a dozen speakers or more with proper passive x-overs.

The hell with 3-way components, I'm runnin' 12-way lol