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I have purchased brand new Jamo speakers A 320. Front and surround measure with ohm meter open circuit. Centre speaker Measure impedance 6 ohms. Is this a normal,i have also checked another set of the same speakers in the shop. They are the same

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Most better low frequency speakers (woofers) measure about 6 ohms because the addition of crossover will bring the impedance up to 8 ohms. Even without the crossover, 6 ohms will not harm the amp or speakers

Posted on Aug 15, 2008

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Marantz NR1402 AV receiver Going to standby Mode


There could be a short in one (or more) of the speaker connections. Try disconnecting all speakers and turning on the receiver. If it still switches to standby, there may be an internal problem.

Mar 03, 2014 | Marantz Nr1402 Av Receiver

1 Answer

Impedance setting on Yamaha AV Receiver


Hi. You can always use a Receiver with an output impedance that is lower than the speakers input impedance.Problems arise when you try to use a Receiver with a higher output impedance than the Speakers input impedance.

Receiver 6 ohms speakers 8 ohms......YES..
Receiver 8 ohms Speakers 6 ohms.......YES, WITH CAUTION

Jan 15, 2013 | Yamaha RX-V673 7.2 Channel AV Receiver...

1 Answer

My amp keeps going off after having been on for about half an hour. The top of the unit feels very hot, could it be overheating? If so, can it be fixed? Regards,


If the top is very hot, I would check the impedance on the speakers to see if any are shorted....one of them may be shorted or in a low ohm state.
Use an ohm meter and look at the speaker ratings.
If you have an 8 or 4 ohm speaker and it's reading 1 or 2 ohms, that's the problem.
Check at the speaker^s connectors if possible with the unit off but speaker connected.
If you have a dead short on any of them, disconnect and reconnect the leads at both the speaker end and the amp end.
If none are a dead short, disconnect the speakers and measure again.
the speakers should read whatever their rated impedance is.

Apr 24, 2011 | Onkyo TX-SR605 Receiver

1 Answer

I have a marantz sr 7001 amp and am running canton 4ohm speakers to front and centre should my amp get really hot and go into protect mode when I am giving it some serious volume


it is not made to drive 4 ohm loads.also if you measure the impedance on the speaker,at some frequencies,it is closer to 3 ohms.This will cause the amplifier to shut down.Today's amplifiers are embellished specs.the old marantz 2325 was 125 watts a channel and weighed 80 pounds.It would eat alive some of the 1000 watt home theater amps of today.Marantz is very nice stuff.

Jan 03, 2011 | Marantz SR-6300 Receiver

1 Answer

Can I install 4 6 ohms speakers on an 8 ohms a/v receiver? receiver Sony STD HD 800 speaker system: Jamo S413 HC S5 Home theatre system,


Best Answer - Chosen by Voters An ohm is a unit of electrical resistance. You can think of it as your speaker will impede or pull 8 ohms from the amplifier that is powering it.

8 ohms is less resistance than 4ohms. So a 4 ohm speaker would require more juice than your 8 ohm.

If this is the only speaker, then that's all the resistance you have to worry about handling. If you had two of these speakers wired in parallel, then the total impedence would be up to be 4 ohms, because each speaker actually reduces the resistance in the circuit...so 8 ohms + 8 ohms = 4 ohms.

You use this information to make sure your amplifier is powerful enough for the speakers. If the speakers have too much resistance, they'll fry your amp.

Here's a good sentence to help explain, but I recommend reading the article I linked in sources...

"An amplifier designed to put out 100 watts into 8 ohms will put out 200 watts into 4 ohms. Two 8 ohms speakers wired in parallel (4 ohms total) would cause the amplifer to produce 200 watts." Source(s): http://www.marktaw.com/recording/Electro…

Nov 26, 2009 | Sony STR-DH800

2 Answers

''protect'' flashed continuously -worked sporadically- seems dead


That model of receiver goes into protect mode when there is really
low
resistance or a short on your speakers/wires. It does it to protect the
final drivers in your amp. Does it do the same thing with all of your
speakers disconnected? If it doesn't then you might have a problem with
one of your speakers or wires. Check your wires for shorts in them
first. That may be the only problem. That model is designed for 8 ohm
speakers, but you can go down two 6 ohms safely. I have a STR -D865 that

has been running 6 ohm speakers safely for almost 3 years now. A way to
check your speakers out is to take an ohm-meter across the terminals on
them(with the receiver unhooked). They should read anywhere between 8
and 4 ohms. Check with the manual on your speakers to see if they
correspond. If the resistance is really low, you may have a short in
that speaker. it is also possible that if they are 4 ohm speakers, you
could have damaged the drivers in your receiver. I know the model above
mine, (the 965) has a 4-8 ohm speaker selection switch on the back. The
lower models were not designed to run 4 ohm speakers. Hopefully this has

been of some help.

Brad / Luisa_K - usenet poster

Apr 03, 2009 | Sony STR-D565 Receiver

1 Answer

Denon AVR-2307 Protection Circuit Activated permenantly


The speakers are 4 ohm speakers, a guy on another chat site sent me a link to the impedance curves http://www.audioholics.com/reviews/s...t-v2-fs/page-4

He agreed to that there was a mismatch as the unit has plenty of fresh air around it, plus all the speaker cables have been tested and installed correctly.

So, off to the store where I got it from tomorrow.


Jan 02, 2009 | Denon AVR-2307 Receiver

1 Answer

I have a simple stereo speaker from Radio Shack. Small metal case with two wire input latches. Each box has two speakers in side. Both speakers boxes went out at the same time. I wasn't there when this...


You need to measure across the speakers themselves n ot the crossover (cap). If these are 8 ohm speakers, an ohm meter will read about 6 or so. That is because both impedence and resistance use the same measurement. With an ohm meter you are measuring resistance. The speakers are rated using impedence.

If both speakers are open (measure infinity), I would suspect a problem with the stereo that caused them to go open. With the stereo on and playing something (radio,cd , or whatever) use a DC voltmeter to measure between the speaker terminals (Red/Black). You should read essentially 0 no matter what the volume. If you read any DC more than 3/4 V, the problem is with the amp section of the stereo.

Dan

Jul 18, 2008 | Audio & Video Receivers

3 Answers

Onkyo 705 receiver shuts off at higher volumes


I had this same problem and it turned out to be a twisted kink in the speaker wire. Run a sound check to each speaker separately (from your receiver menu) and turn each one up until the receiver shuts off. Check the wire to the speaker that caused it to shut off and make sure the +- ends are not touching each other at either end, and that there are no twists or kinks along the way.

Nov 04, 2007 | Audio & Video Receivers

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