opus
Seeker Of Truth
Posts: 1
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Post by opus on Jan 9, 2018 15:33:56 GMT -5
Anybody know if this amplifier inverts phase? I did e-mail Emotiva and received a reply saying the A-300 does NOT invert phase. Thanks for the replies.
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Post by leonski on Jan 10, 2018 23:38:45 GMT -5
Easy Test: connect ONE channel of the Rogue to a speake thru its current amp. Dummy load to the other channel, since it is a tube amp and a no-load condition is not a good idea
Connect the other channel of the A-300 to the other channel. Listen to bass. Swap speaker leads. Listen for bass. 'Correct' bass will be 'in phase' between the 2 amps.
Real thin bass is out of phase.
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Post by boomzilla on Jan 11, 2018 6:27:04 GMT -5
e-mail Emotiva & ask.
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Post by Soup on Jan 11, 2018 7:46:07 GMT -5
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KeithL
Administrator
Posts: 9,901
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Post by KeithL on Jan 11, 2018 10:06:32 GMT -5
IMPORTANT NOTE
First off, I'm not totally sure, but I believe the A-300 does not invert.
Second off, everyone should remember that speakers are "a full floating balanced differential device". In other words, if one or more sets of channels is out of phase, just flip the (+) and (-) wires at the speaker, or at the back of the amp, to reverse the phase. (The ONLY exceptions would be speakers that require a common ground, like certain large Polk speakers that have some sort of cross connect, and certain speakers with built-in powered subs.)
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Post by rbk123 on Jan 11, 2018 10:53:23 GMT -5
Ask Emotiva, but while waiting, hook it up both ways (speaker polarity reversal) and see which way you like better. 1 way should sound substantially worse.
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Post by leonski on Jan 11, 2018 14:00:35 GMT -5
Given that there are NO Standards for recording phase, I doubt it'll make much difference. The check I proposed WILL tell you which inverts and which doesn't, relative to the Rogue.
Relative phase matters. Bass will either be 'shy' or 'OK', depending.
Absolute phase? IIrrelevent, since, as I note, NO standards exist in the recording industry. A song pieced together with tracks recorded in various studios may even be out of phase internally.
Test yourself. FEW can tell absolute phase or have a reliable preference.
Reverse phase of inputs to amp? You'll need cable, connectors and a soldering iron. Uness you have 2 sets of cables ready to go, the time to do the swap might 'swamp' your ability to tell any differernce. For the speaker level swap? EASY as swapping + / - on both speakers at once.
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KeithL
Administrator
Posts: 9,901
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Post by KeithL on Jan 11, 2018 14:27:22 GMT -5
Huh? In order to reverse the phase on a signal you have to swap the (+) and (-) leads. You can do this on a speaker - because neither terminal is hard-connected to ground. You can also do this to the two signal leads in a BALANCED cable - because they're symmetrical. However, you CANNOT do it with an UNBALANCED input..... An unbalanced interconnect has two leads - signal and ground. Except for a few rare exceptions they are NOT interchangeable. And trying to do so will result in either a weird sounding monaural signal, a really nasty noise, or even perhaps damage to one of the components involved. Or just reverse the line level inputs to the amp; 2 interconnects vs. 4 speaker wires. Ask Emotiva, but while waiting, hook it up both ways and see which way you like better. 1 way should sound substantially worse.
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Post by rbk123 on Jan 11, 2018 16:36:21 GMT -5
Doh, you're right. I was thinking of L/R being incorrect, not phase inversions. My bad; edit'ing my post now.
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Post by leonski on Jan 11, 2018 18:36:30 GMT -5
Huh? In order to reverse the phase on a signal you have to swap the (+) and (-) leads. You can do this on a speaker - because neither terminal is hard-connected to ground. You can also do this to the two signal leads in a BALANCED cable - because they're symmetrical. However, you CANNOT do it with an UNBALANCED input..... An unbalanced interconnect has two leads - signal and ground. Except for a few rare exceptions they are NOT interchangeable. And trying to do so will result in either a weird sounding monaural signal, a really nasty noise, or even perhaps damage to one of the components involved. Or just reverse the line level inputs to the amp; 2 interconnects vs. 4 speaker wires. Ask Emotiva, but while waiting, hook it up both ways and see which way you like better. 1 way should sound substantially worse. right you are. A hot/ ground swap on a single ended cable CAN have a poor outcome ranging from a muted / mono signal to an outright short and damage. See my original post, this thread, for how to compare amps for inverted signal ...
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