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Old 7th September 2012, 11:47 AM   #1
taeedy is offline taeedy  China
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Default Reciever pre-out question.

Hello fellow DIYers,

Recently, I had to retire my old reciever. The control section of it gave out.

Now, I just today picked up my new Onkyo TX-NR717 and am installing it as a pre-amp. I will not be using the speaker-outs. My question: is it necessary to have any sort of dummy load connected to the speaker-outs or can they be left open that they will not result in any damage, heating issues etc.?

Pardon me if this matter has been discussed before.

Thanks for your attention.

Regards,
Taeedy
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Old 7th September 2012, 01:04 PM   #2
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A load (100 ohm/5 watt) would be a good idea. E
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Old 7th September 2012, 01:24 PM   #3
taeedy is offline taeedy  China
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Cheers, mickeymoose.
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Old 7th September 2012, 01:45 PM   #4
sreten is offline sreten  United Kingdom
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Hi,

Its highly unlikely you need to connect anything.
By definition some of the channels may not be used.

rgds, sreten.
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Old 7th September 2012, 02:27 PM   #5
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Absolutely no dummy load for solid stste devices.
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Old 7th September 2012, 06:58 PM   #6
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I totally disagree with sreten and C.500 and would like to know their reasons for disbelieving in terminating an amp output. E
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Old 7th September 2012, 07:17 PM   #7
reji is offline reji  India
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one of my friend told me that its better to use dummy load because amp likely to oscillate without load.
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Old 7th September 2012, 07:48 PM   #8
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I have never had to terminate a solid state amp for any reason.

A solid state amp will freely swing it's voltages with no extra current drawn from it or through its output stages.
Only it's bias currents should exist.

If you feel you should terminated it for stability reasons, use a high value of resistor such as a 100 to 1000 ohm value.

Even a 100 ohm resister on a 100watt amp would have to have at least a 10 watt rating.

FWIW

jer

Last edited by geraldfryjr; 7th September 2012 at 07:53 PM.
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Old 8th September 2012, 01:22 AM   #9
taeedy is offline taeedy  China
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Hey guys, thanks for all your suggestions.

Cheers.
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Old 8th September 2012, 06:49 AM   #10
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Quote:
Originally Posted by mickeymoose View Post
I totally disagree with sreten and C.500 and would like to know their reasons for disbelieving in terminating an amp output. E
Why does it need termination? Virtually all SS amps are OTL constant Voltage devices. A 'dummy load' will simply cause some heat both in the load and amp. Since you say you're not using the actual power amp, just the preamp out which will still source the internal amp there should be no problem unless it's a REALLY BAD design. If you're getting in to the point of the preamp line out to an external amp, why can't you disconnect the feed to the internal amp and either install a switch or if space is there, pre out / main in jacks like many other units? BTW, if a load was important, wouldn't the manufacturer include one for when the speakers were turned off?
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