2 Ohm
Senior User
Joined: Sep 2003
Posts: 150
Likes: 0
From: NC
You need to match the impedence of the driver (speaker) with the impedence of your amplifier. Ohms law states that when you halve the resistance, you double the power. But also in there, you can change passive crossover points. So while you may drive an amp that runs 100 watts at 4 ohm to 200 watts at 2 ohm, you will change the crossover from say 500 hz to 1000 hz. Gotta be careful not to put a speaker out of range. Distortion kills more than power.
Senior User
Joined: Aug 2003
Posts: 114
Likes: 0
From: Acworth, GA
If you wire 2 2-ohm subs in series, you get a 4-ohm load. So with 2 ohm subs, you could use 4 subs (2 per channel) wired in series and your amp would see 4 ohms per channel (standard resistance for car audio). If you can only fit 2 subs in your truck, go with 4 ohm subs, and wire 1 per channel.
...but...
if your amp is 2-ohm stable, you could wire 2 ohm subs (1 per channel) and it would work. But you would need some good fans to cool the amp off unless it has one built in.
...but...
if your amp is 2-ohm stable, you could wire 2 ohm subs (1 per channel) and it would work. But you would need some good fans to cool the amp off unless it has one built in.
Senior User
Joined: Sep 2003
Posts: 113
Likes: 0
From: Hampstead, NC
the crossover point will change if you are using a passive crossover network. Not many people are doing this, since most amps have electronic crossovers built in.
There is also a difference in 4ohm Mono stable and 4ohm Stereo stable....
Best bet- If you do not know what you are doing, please get to a good shop and listen to them!!!
If you didn't know, I design and install custom home A/V Systems, and Car Audio is my biggest Hobby.
There is also a difference in 4ohm Mono stable and 4ohm Stereo stable....
Best bet- If you do not know what you are doing, please get to a good shop and listen to them!!!
If you didn't know, I design and install custom home A/V Systems, and Car Audio is my biggest Hobby.
Trending Topics
Senior User
Joined: Sep 2003
Posts: 113
Likes: 0
From: Hampstead, NC
Back to the original question-
(R1*R2) / (R1+R2) = Final Nominal Imp.
(4*4) / (4+4) = 2 Ohms
(16) / (8) = 2 ohms
100w @ 4 ohm mono
200w @ 2 ohm mono if the amp is stable to 2 ohms mono.
As far as your amp is knows, 4ohm stereo and 8ohm mono are the same. 2ohm stereo and 4ohm mono are the same.......
Dual Voice coil subs-
Two 4 ohm coils = 8 ohms (Series)
2 ohms (Parralell) + to + - to -
This gives you more options for Amps you can use to power your system.
(R1*R2) / (R1+R2) = Final Nominal Imp.
(4*4) / (4+4) = 2 Ohms
(16) / (8) = 2 ohms
100w @ 4 ohm mono
200w @ 2 ohm mono if the amp is stable to 2 ohms mono.
As far as your amp is knows, 4ohm stereo and 8ohm mono are the same. 2ohm stereo and 4ohm mono are the same.......
Dual Voice coil subs-
Two 4 ohm coils = 8 ohms (Series)
2 ohms (Parralell) + to + - to -
This gives you more options for Amps you can use to power your system.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
Senior User
Joined: Sep 2003
Posts: 150
Likes: 0
From: NC
Originally posted by aquaholic
the crossover point will change if you are using a passive crossover network. Not many people are doing this, since most amps have electronic crossovers built in.
There is also a difference in 4ohm Mono stable and 4ohm Stereo stable....
Best bet- If you do not know what you are doing, please get to a good shop and listen to them!!!
If you didn't know, I design and install custom home A/V Systems, and Car Audio is my biggest Hobby.
the crossover point will change if you are using a passive crossover network. Not many people are doing this, since most amps have electronic crossovers built in.
There is also a difference in 4ohm Mono stable and 4ohm Stereo stable....
Best bet- If you do not know what you are doing, please get to a good shop and listen to them!!!
If you didn't know, I design and install custom home A/V Systems, and Car Audio is my biggest Hobby.
Didn't know the mono / stereo thing. That's good to know. Thanks...
Dan Q