What can I do with 2 2ohms woofers?

[SSSnail]

Calling yoyo...

These.

Moved form Off Topic
Sr Moderator allisolm

 

[Ronstang]

Get an amp that is stable in low ohm loads? I have an amp out in the garage that is capable of 600 watts in a 1 ohm load and it is almost 25 years old.

 

[Howard]

Tapped horn

 

[YOyoYOhowsDAjello]

Originally posted by: SSSnail
Calling yoyo...

You can

-make doorstops
-use them as candy bowls
-put them behind the back wheels of your car when parked on a hill
-tie a chain to one and use it as an anchor (for a boat, or on land for a small child)
-wire them in series and get an amp that can handle 4-ohm loads
-wire them in parallel and get an amp that can handle 1-ohm loads
-wire them two two amp channels to an amp that can handle 2-ohm loads
-ask in the garage forum where people know more about hooking up these kind of subs and will be able to tell you if I (not knowing anything about car audio) have given you the right advice)
-ask in the AV&HT area where where people know more about hooking up these kind of subs and will be able to tell you if I (not knowing the whole picture on DIY) have given you the right advice)
-use them as ammunition for a DIY catapult or trebuchet
-throw them out a window to check durability and reaction time of passers-by
-hook them up to your bike and make one of these

...the possibilities are endless

 

[zanejohnson]

they can either be run in 1 ohm in parallel, or 4 ohms in a series...so really you dont need an amp that can do 1ohm.

 

[SSSnail]

So series is like this right?

- - + +, effectively they become a single 4 ohms speaker with double the wattage requirement?

 

[zanejohnson]

Originally posted by: SSSnail
So series is like this right?

- - + +, effectively they become a single 4 ohms speaker with double the wattage requirement?

series is pos from the amp......to pos on woofer one...and then neg from woofer 1 to pos on woofer two...and then neg from woofer 2 back to neg on the amp.

 

[YOyoYOhowsDAjello]

Originally posted by: SSSnail
So series is like this right?

- - + +, effectively they become a single 4 ohms speaker with double the wattage requirement?

I didn't real any of the text (going to bed now), but this site has pictures of what series vs. parallel wiring looks like.
http://www.termpro.com/articles/spkrz.html

For the cabinet that these will do in, that's going to depend on the parameters of the woofers.
In the Features & Specs, they have suggested volumes for sealed and ported. There are also calculators out there that help you figure out optimal cabinet volume based on the parameters of the woofers. I've never used one before though.

 

[zanejohnson]

+ + - - is parallel by the way, both resisters parallel like that doubles the resistance, so 2ohms turns into 1ohm

 

[SSSnail]

Originally posted by: zanejohnson
+ + - - is parallel by the way, both resisters parallel like that doubles the resistance, so 2ohms turns into 1ohm

Thanks you two, had a bit of brain fart there. I think I'm gonna build two single boxes with a design I'm experimenting. Something that will have a small footprint but has big sound.

 

[fleabag]

What is the issue with using a device that is higher or lower ohm than the receiver is designed for?

 

[13Gigatons]

Wiring in series doesn't require double the wattage, it requires more voltage instead of current from the amp. 2 ohms is pretty low and 1 ohm will crush most amps

Also a sealed enclosure will bottom out the drivers long before they use 1500 watts of power.

 

[Howard]

Originally posted by: 13Gigatons
Wiring in series doesn't require double the wattage

Compared to wiring in parallel, to achieve the same SPL, you do.

Also a sealed enclosure will bottom out the drivers long

As opposed to what other type of enclosure?

 

[13Gigatons]

Originally posted by: Howard

Originally posted by: 13Gigatons
Wiring in series doesn't require double the wattage

Compared to wiring in parallel, to achieve the same SPL, you do.

Also a sealed enclosure will bottom out the drivers long

As opposed to what other type of enclosure?

35 watts can be 35 x 1 or 10 x 3.5, both are 35 watts. A 1 ohm load will draw more current and require less voltage. A 4 ohm load would require higher voltage and draw less current.


The 1500 watt rating is is the max the voice coil can handle but the cone would bottom out long before you could use that much power in a sealed enclosure. A vented enclosure would increase the power handling and also increase output. Only downside is output drops off pretty fast below port frequency and you need to have a subsonic filter.

 

[Pulsar]

Originally posted by: zanejohnson
+ + - - is parallel by the way, both resisters parallel like that doubles the resistance, so 2ohms turns into 1ohm

Um, no.

Resisters in parallel half the resistance.
Resisters in series double it.

 

[Gillbot]

Originally posted by: Pulsar

Originally posted by: zanejohnson
+ + - - is parallel by the way, both resisters parallel like that doubles the resistance, so 2ohms turns into 1ohm

Um, no.

Resisters in parallel half the resistance.
Resisters in series double it.

Umm, no....

That only applies if the resistive values are equal. In series, the resistive values are summed. For a parallel circuit it uses the following formula:

Parallel circuit 1/Rt = 1/R1 + 1/R2 + 1/R3 + ...

 

[BlackTigers]

http://www.rockfordfosgate.com...fer_qty=2&woofer_imp=3

 

[KIAman]

Originally posted by: zanejohnson
+ + - - is parallel by the way, both resisters parallel like that halves the resistance, so 2ohms turns into 1ohm

Fixed. I'm pretty sure 1 is exactly a half of 2.

 

[evident]

Originally posted by: YOyoYOhowsDAjello

Originally posted by: SSSnail
Calling yoyo...

You can

-make doorstops
-use them as candy bowls
-put them behind the back wheels of your car when parked on a hill
-tie a chain to one and use it as an anchor (for a boat, or on land for a small child)
-wire them in series and get an amp that can handle 4-ohm loads
-wire them in parallel and get an amp that can handle 1-ohm loads
-wire them two two amp channels to an amp that can handle 2-ohm loads
-ask in the garage forum where people know more about hooking up these kind of subs and will be able to tell you if I (not knowing anything about car audio) have given you the right advice)
-ask in the AV&HT area where where people know more about hooking up these kind of subs and will be able to tell you if I (not knowing the whole picture on DIY) have given you the right advice)
-use them as ammunition for a DIY catapult or trebuchet
-throw them out a window to check durability and reaction time of passers-by
-hook them up to your bike and make one of these

...the possibilities are endless

i'd say go for this option, or get an amp that handles 2-ohms

 

[Pulsar]

Originally posted by: Gillbot

Originally posted by: Pulsar

Originally posted by: zanejohnson
+ + - - is parallel by the way, both resisters parallel like that doubles the resistance, so 2ohms turns into 1ohm

Um, no.

Resisters in parallel half the resistance.
Resisters in series double it.

Umm, no....

That only applies if the resistive values are equal. In series, the resistive values are summed. For a parallel circuit it uses the following formula:

Parallel circuit 1/Rt = 1/R1 + 1/R2 + 1/R3 + ...

The situation we are discussing is that of two equal (1 ohm) speakers.

 

[BlackTigers]

Originally posted by: Pulsar

Originally posted by: Gillbot

Originally posted by: Pulsar

Originally posted by: zanejohnson
+ + - - is parallel by the way, both resisters parallel like that doubles the resistance, so 2ohms turns into 1ohm

Um, no.

Resisters in parallel half the resistance.
Resisters in series double it.

Umm, no....

That only applies if the resistive values are equal. In series, the resistive values are summed. For a parallel circuit it uses the following formula:

Parallel circuit 1/Rt = 1/R1 + 1/R2 + 1/R3 + ...

The situation we are discussing is that of two equal (1 ohm) speakers.

These are two equal 2ohm voice coils though?

 

[CTrain]

Your title is misleading.
Are you saying you have 2 of these woofers ?? Or just 1 ??
You say woofers meaning more than 1 or you just meant to say dual 2 ohms woofer ?

If you only have 1 of these woofer, than you can run it in 1ohm or 4ohms.
Since this woofer require alot of power, get a mono amp thats 1-ohm stable.
Sure you can get an amp to run the woofer at 4ohms, but amps produce more alot more power once you lower the impedance.

My advice ?? Ummm...find a different woofer if you haven't bought that one already.

 

[brblx]

took a whole page for someone to point out that that's a DVC sub, eh?

as stated, one of those could be 1ohm or 4ohm, two would be 2ohm or 8ohm (or .5, but half ohm stable amps are pretty damned rare). being MA, the 1500wrms rating is probably pretty generous, but you'd still be looking for a pretty powerful amp. cheapest way to run them would indeed be a 1ohm stable monoblock, but that would only work with one of those.

 

[Howard]

Originally posted by: 13Gigatons

Originally posted by: Howard

Originally posted by: 13Gigatons
Wiring in series doesn't require double the wattage

Compared to wiring in parallel, to achieve the same SPL, you do.

Also a sealed enclosure will bottom out the drivers long

As opposed to what other type of enclosure?

35 watts can be 35 x 1 or 10 x 3.5, both are 35 watts. A 1 ohm load will draw more current and require less voltage. A 4 ohm load would require higher voltage and draw less current.


The 1500 watt rating is is the max the voice coil can handle but the cone would bottom out long before you could use that much power in a sealed enclosure. A vented enclosure would increase the power handling and also increase output. Only downside is output drops off pretty fast below port frequency and you need to have a subsonic filter.

Paralleling drivers can increase the sensitivity by up to 6dB.

IIRC sealed enclosures have better power handling everywhere except for the region where the port response is at the maximum.

 

[13Gigatons]

Originally posted by: Howard

Originally posted by: 13Gigatons

Originally posted by: Howard

Originally posted by: 13Gigatons
Wiring in series doesn't require double the wattage

Compared to wiring in parallel, to achieve the same SPL, you do.

Also a sealed enclosure will bottom out the drivers long

As opposed to what other type of enclosure?

35 watts can be 35 x 1 or 10 x 3.5, both are 35 watts. A 1 ohm load will draw more current and require less voltage. A 4 ohm load would require higher voltage and draw less current.


The 1500 watt rating is is the max the voice coil can handle but the cone would bottom out long before you could use that much power in a sealed enclosure. A vented enclosure would increase the power handling and also increase output. Only downside is output drops off pretty fast below port frequency and you need to have a subsonic filter.

Paralleling drivers can increase the sensitivity by up to 6dB.

IIRC sealed enclosures have better power handling everywhere except for the region where the port response is at the maximum.

Having two sub-woofers close enough together can increase output by 6db.

Subwoofers are limited by the power the voice-coil can handle and how soon the cone will bottom out. The cone may bottom out with 300 watts in a sealed enclosure long before the 1500 watt rating is achieved. A Vented enclosure will reduce the wild excursions and increase output.