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WHAT SHOULD THE OUT PUT VOLTAGE BE AT SUB OUT MY SUB SPEAKER HAS 6OHMS OF RESISTANCE

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Hi there,

Well power is the product of Voltage times Current.
If you load an amp with lower impedance than it's rated at, for the same voltage that the amp is outputting there will be a higher current. But if you reduce the voltage (by reducing the volume) then the current will be as it is for the rated impedance. Summarizing: Limit the Total Power that the amp is handling by not exceeding the volume. If you run loads lower than 6 Ohms, you may be exceeding the max current that the amp's output transistors can handle. You can please check the following link for more information -

http://www.churchsoundcheck.com/imp1.html

(Just copy and past the above link in your web browser)

Please tell us the model number of your Home theater system, so we can help you more accurate)

Thanks

Posted on Feb 07, 2010

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HelloCheck the output impedence [indicated in OHms]]. You can get it from its manual. If it is designated as; 8OHms for example; you can connect one 8OHMs speaker direltly, or two 4 OHMs speakers in serieal connection. Likeways, if the output impedence is 6OHms, you can connect one 6OHms speaker direltely, or 2 12OHMs speakers in parellel. Just see, when we connect thow speakers in serieal, the impedence will be the sum of both speaker impedences. if we connect the same in parellel, the impedence will get halved. OK.

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No the LOWER the resistance the MORE Output or Draw, If say it is 100 Watts into 4 Ohms, if you used a 2 ohm speaker it would draw 200 watts.(only if capable of delivering that amount of power) The LOWER the Resistance, the HIGHER the Current Draw. WATTS = AMPS x VOLTS. (This is not strictly true with amplifiers output though, as it is an AC Current, and a "Reactive" load, it has, Inductance, Capacitance and Resistance, all in one.and is worked out via a Formula) see below. http://en.wikipedia.org/wiki/Audio_power

http://www.hometheaterhifi.com/volume_1_1/v1n1spk.html

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Resistance = Voltage divides by Current.

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You will probably find the sub is 8 ohms and your amp might deliver 1500 Watts on a 2 ohm system (this is "specsmanship" to sell their product... more is better thing...

If your amp was as above, the max voltage output would be the same before clipping but with the resistance 4 times, the current is only one fourth that which would deliver 1500 Watts. So you would only get 1500/4 Watts into the speaker or about 375 Watts.

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Just curious, is this an upgrade in electronics? From what?

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1 Answer

I am not getting power to my sub-woofer that i added on sub works fine just no out put to it checked resistance getting nothing


checked resistance getting nothing
Nothing = zero or nothing = infinite?
If it is essentially zero, you are probably OK since the DC ohms of nearly any speaker measures very low resistance; they are rated in impedance which is a complex combination of  resistance (R), inductance (L), and a little capacitance (C) and becomes the 'Z' of the rating of (typically) 4-8 ohms.
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