ISOBARIC 16 ohms load powered by 8 ohms Amp

eddi0 · 10th October 2006, 06:36 AM

Hello,

This is my first post. I would like to know if I run dual 8 ohms 18s in an isobaric configuration it will produce 16 ohms load and if I want to run my QSC RMX 1450 mono bridged @ 8ohms it produces 800 watts is this possible, or will it produce distortion.

If this does not work then I would have to buy (2) 4 ohms 18s and connect it in an isobaric configuration to produce 8 ohms load, then I can use my amp.

Please let me know your input.

Thanks,
Ed

Lothar34 · 10th October 2006, 06:43 AM

It depends on how you wire the drivers:
http://www.bcae1.com/

Two 8ohm drivers can be wired as a 4ohm load or a 16ohm load.

Two 4ohm drivers can be wired as a 2ohm or 8ohm load.

Your best bet is probably two 4ohm drivers wired for an 8ohm load.

eddi0 · 10th October 2006, 06:54 AM

I agree with you but since this is an isobaric setup.....I can't wire it to a 4 ohm setup. It has to be 16 ohm.

Thanks for the reply.

Ed

Lothar34 · 10th October 2006, 07:29 AM

You have two drivers, right?

You can wire them in series or parallel for either a 16- or 4-ohm load. The fact that it's an isobaric setup doesn't enter into it.

If you want an 8ohm load for your amp, then your best bet is to get two 4ohm drivers and wire them in series. Unless you come across a 16ohm driver that you really like. They're fairly rare though.

forr · 10th October 2006, 12:16 PM

Be aware that an isobarik configuration using two 18' implies an important moving mass. Some people on this forum have complained of moving subs enclosures. The ratio between the moving mass and the mass of the enclosure was the first reason.

eddi0 · 10th October 2006, 02:32 PM

Yes....Moving mass? hrmmm I'm not sure I understand you clearly....

Ed

eddi0 · 10th October 2006, 02:32 PM

Yes! Parallel would give a 4 ohm load for out of phase.....what was I thinking, but I am interested in the moving mass theory? Is that when the subs are too powerful.....the cabinet moves?

Edward

audioPT · 10th October 2006, 06:14 PM

Quote:

Originally posted by eddi0
.....the cabinet moves?

It's more like shaking!

The amount of air pressure is so intense that if the cabinet weight and size are small, two things can happen:
1 - Running Sub or
2 - Broken Sub

Don't you have a pic of the sub?!
And dimensions of the enclousure?!

forr · 10th October 2006, 08:19 PM

The cabinet may move :
subwoofer moving on the floor...

audioPT · 10th October 2006, 10:08 PM

If you have possibilities, try this:

Screw the sub to a base board and put only 3 feets or spikes.

If the sub stand still...

10th October 2006, 06:36 AM	#1
eddi0 diyAudio Member Join Date: Oct 2006	ISOBARIC 16 ohms load powered by 8 ohms Amp Hello, This is my first post. I would like to know if I run dual 8 ohms 18s in an isobaric configuration it will produce 16 ohms load and if I want to run my QSC RMX 1450 mono bridged @ 8ohms it produces 800 watts is this possible, or will it produce distortion. If this does not work then I would have to buy (2) 4 ohms 18s and connect it in an isobaric configuration to produce 8 ohms load, then I can use my amp. Please let me know your input. Thanks, Ed

10th October 2006, 06:54 AM	#3
eddi0 diyAudio Member Join Date: Oct 2006	Hrmmm... I agree with you but since this is an isobaric setup.....I can't wire it to a 4 ohm setup. It has to be 16 ohm. Thanks for the reply. Ed

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10th October 2006, 06:43 AM	#2
Lothar34 diyAudio Member Join Date: Sep 2006	It depends on how you wire the drivers: http://www.bcae1.com/ Two 8ohm drivers can be wired as a 4ohm load or a 16ohm load. Two 4ohm drivers can be wired as a 2ohm or 8ohm load. Your best bet is probably two 4ohm drivers wired for an 8ohm load.

10th October 2006, 07:29 AM	#4
Lothar34 diyAudio Member Join Date: Sep 2006	You have two drivers, right? You can wire them in series or parallel for either a 16- or 4-ohm load. The fact that it's an isobaric setup doesn't enter into it. If you want an 8ohm load for your amp, then your best bet is to get two 4ohm drivers and wire them in series. Unless you come across a 16ohm driver that you really like. They're fairly rare though.

10th October 2006, 12:16 PM	#5
forr diyAudio Member Join Date: Dec 2004 Location: Next door	Be aware that an isobarik configuration using two 18' implies an important moving mass. Some people on this forum have complained of moving subs enclosures. The ratio between the moving mass and the mass of the enclosure was the first reason.

10th October 2006, 02:32 PM	#6
eddi0 diyAudio Member Join Date: Oct 2006	Yes....Moving mass? hrmmm I'm not sure I understand you clearly.... Ed

10th October 2006, 08:19 PM	#9
forr diyAudio Member Join Date: Dec 2004 Location: Next door	The cabinet may move : subwoofer moving on the floor...

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