Question about Technics SA-AX730 Receiver

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Technics sa-ax730 won't play a&b speakers at same time.

Says "low imp" where a &b speakers are dsplayed

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Low imp probably means "Low Impedance". You've got either too many speakers hooked up in parallel on the same binding posts or spring contacts or the single sets of speakers on A & B are low impedance to begin with (i.e. 4ohms).

When you switch between A, B, and A + B, the last setting just puts B in parallel anyway.

Too low an impedance means higher current and the receiver may not be capable of handling it. Check your owner's manual for recommended speaker impedances.

If you test with a single set of speakers, switching the actual cables from A to B should work (even at a nominal 4ohms). If that's the case then you will need a different set or sets or speakers to hook up to B. If it doesn't work at all and still says "low imp", test with a known higher impedance speaker (i.e. ~8ohms).

If none of that works, you're on your own.

Good luck in any case.

Posted on Feb 04, 2009

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This is similar to protect mode in that the amp has detected a short in the output and has shutdown to prevent damage. Without seeing the unit, I'm a bit hesatant to suggest repair tips. At this point, I would suggest you get a detailed estimate from a local shop. We should be able to guide you through the actual repair once the results are posted here.


Posted on Feb 04, 2009


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What are the functions of the impedance button on the Technics SA-AX730

This allows you to select the correct amplifier output impedance for the particular speakers you have connected, Proper selection insures the best efficiency, response and prevents potential damage to speakers or the amplifier, Refer to page 17 of this manual:

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What is speaker A low imp . how to use speaker B.thank.

The Low Impedance setting is for when you have even one speaker with <8-ohms nominal impedance so you can use bot speaker pairs together. You still need to have an effective total (parallel) impedance of 4-ohms minimum or there may be problems like blowing up the amps.

Press and hold the SPEAKERS A or B button until LOW IMP lights or goes out, as required.

Press either button to toggle that speaker pair on or off.

It's in the manual page 14, 22 and 25.

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I want to buy a Technics SA-DX940 reciever

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"Low Imp"

Low Impedance is not a suggestion, it is a WARNING. Your receiver is telling you it senses TOO LOW a load and it's trying to protect itself from damage.

Speakers A& B are running in parallel, so their combined impedance, X, is found by using the formula: 1/X = 1/A + 1/B.

In other words, two 8-ohm speakers in parallel would yield a 4-ohm load.

If your speakers are identical, try running them in series on one speaker output pair. That would keep the impedance safely high.

Feb 15, 2010 | Technics SA-AX540 Receiver

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LOW IMP when trying to select A and B speakers together

Check the back of your speakers (both sets). If they are rated at less than 6 ohms, you cannot use both sets at the same time. (see page 12 of the manual)
Hope that helps!

Oct 03, 2009 | Panasonic SA-HE100 Receiver

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Your speakers are way tp powerful you should only use speakers just over what the amp is rated at the most and check your impedance is not lower then 6 ohms and turn the bass to half way i am using 60 watt bookcase psb speakers and they work just fine and they pound no problem

Aug 24, 2007 | Technics SA-AX730 Receiver

1 Answer

Technics SA-AX730

The very FIRST thing to check is to make certain ALL of your speakers have an IMPEDENCE of 8 OHMS. Virtually all speakers of even modest quality will include this specification on a label on the back of the speaker. You CANNOT run more than (2) TWO speakers with 4 OHMs impedence on ANY amplifier (technical discussion too long!) [NOTE: Even though fused, your receiver has internal overload protection systems to prevent permanent damage. However, you cannot re-set these systems yourself. Your dealer or authorized service center must do this.] But, before you take it in for service, there is one more "test": check for shorted and/or mis-connected/disconnected speaker cables/wires. Visually inspect connections at the receiver and speakers first. You might find something obvious! If everything looks okay, then disconnect ALL of the speakers; and reconnect and test them one at a time (at relatively low volume.) For example, reconnect the left front speaker, test the system; THEN add the right front, test the system,and so on, ADDING one more speaker each time - FIRST MAKING SURE EACH OF THEM HAS AN IMPEDENCE OF AT LEAST 8 OHMS! IF there is a short (or bad speaker) this will help isolate it. Hopefully one of these "fixes" will work for you. GOOD LUCK!

Jul 07, 2007 | Technics SA-AX540 Receiver

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