Author Topic: Does the A+B setting mean a Parallel connection ?  (Read 861 times)

Offline B_Unit

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Does the A+B setting mean a Parallel connection ?
« on: June 29, 2017, 03:23:30 PM »
Hello Guys.

I have a Kenwood KA-6100 Amp.

Today I received a new set of speakers (Grundig Box 5000's) I would like to hook them up to the Amp.

This means running another pair of cables to the amp.

Would it be acceptable if I just connect the 2 pairs of speakers together in parallel at the speakers terminals and then have 1 wire running off to the Amplifiers A output ?

Basically would be equivalent to running them both on the A+B setting ?

Regards

Byron

Offline Steerpike

Re: Does the A+B setting mean a Parallel connection ?
« Reply #1 on: June 29, 2017, 05:37:38 PM »
Hey B!

Not all amplifiers make the "Speaker A+B" a parallel connection. Some put the speakers in series in this mode.

Whether the amp will tolerate it, depends on the amp.
Does it specify that it can cope with a 4 Ohm load? In this case, it can, according to the manual, so if both speaker sets are 8 Ohm, then you are fine.

Putting a 4 Ohm load onto an 8 Ohm-only amp is a little risky, but can be done if you keep the volume moderate to low at all times.

Older German loudspeakers were often 4 Ohms, in which case parallelling them with anything is a definite NO.
« Last Edit: June 29, 2017, 05:44:45 PM by Steerpike »

Offline B_Unit

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Re: Does the A+B setting mean a Parallel connection ?
« Reply #2 on: July 01, 2017, 08:44:56 PM »
Hey Dave,

Thanks for the info.

The speakers raitings are not to clear they have written " 4...8 Ohms"

Here is a picture



Offline Steerpike

Re: Does the A+B setting mean a Parallel connection ?
« Reply #3 on: July 02, 2017, 12:05:35 AM »
Since the nominal impedance is known to go down to 4 Ohms, (who knows for what part of the spectrum though) I'd be cautious... keep the volume low, or put the speakers in series rather than parallel, or add a 2R to 3R resistor in series with each speaker before combining them on the amp.

Offline B_Unit

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Re: Does the A+B setting mean a Parallel connection ?
« Reply #4 on: July 03, 2017, 05:37:00 PM »
Hey Dave,

I put the speakers in Series.

Thank you for the advice.

Byron