What is Monaural, Dual mono, stereo in fact? - diyAudio
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Old 5th March 2014, 06:09 PM   #1
oszkar is offline oszkar  Romania
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Default What is Monaural, Dual mono, stereo in fact?

Hello!

Only as a matter of clearing my head, what is Stereo, Dual mono and monaural?

I know that dual mono means, 2 amps, 2 PSU
Monaural is the same thing?
What is Stereo?

All this questions refer to amplifier section.

My AX-1070 what kind of matter is, in terms of amplifiers?

Thank you!
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Old 5th March 2014, 06:46 PM   #2
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Stereo is a derived mix of mono source material in a recording studio created during the mixdown process. Microphones, guitars, instruments etc are inherently mono sources. By using a mixing console and panning each separate mono source to various spatial positions between the two channels of the stereo mix buss a stereo field is created. It is a purely derived sound field.
Dual mono is merely two separate or similar mono sources played back on two different channels and speakers. There is no stereo effect.
Mono of course is just mono sources played back on one single channel and speaker.
Your AX1070 is a stereo amp (L/R)
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Old 5th March 2014, 07:01 PM   #3
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With respect, the term "dual mono" is widely used in Hi-fi circles to describe a stereo amplifier built as 2 complete, electrically separate amplifiers within the one case - functionally the same as a stereo amp, but having 2 power supplies, 2 transformers etc. and no common signal wiring.

The purpose is to ensure the absence of crosstalk and the influence of supply sag at all frequencies, whilst retaining the cost advantages and simplicity of a single case. Many High-end and DIY amps are of this form.
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Old 5th March 2014, 07:08 PM   #4
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I will take issue with djmeverett's statement that "it is a purely derived sound field". Some stereo recordings are done with paired microphones, and do capture a stereo sound field that is not "purely derived".
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Old 5th March 2014, 07:08 PM   #5
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Why not do dual-mono and stereo at the same time? TDA7293 Parallel kit from ebay (modular/slave style, no lossy emitter resistors)
The photo and elsewhere on the thread shows a Very simple and inexpensive way to have dual mono despite using 1 transformer and 1 power supply board.
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Old 5th March 2014, 08:44 PM   #6
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Quote:
Originally Posted by danielwritesbac View Post
.....The photo and elsewhere on the thread shows a Very simple and inexpensive way to have dual mono despite using 1 transformer and 1 power supply board.
That's a stereo chip amplifier kit, whether purchased all on one PCB or using separate PCBs. You can build that or any separate PCB layout design amplifiers in Mono form (Monobloc), Stereo or dual Mono but the difference is all in the number of PSUs, and the degree to which they are electrically separated. The only circuit in common for either Dual Mono or Monobloc amplifiers should be PE (protective earth or chassis ground) which should not be coupled to signal ground in any event. In most cases though, the only common connection will be the inevitable unbalanced signal ground.
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Last edited by Ian Finch; 5th March 2014 at 08:51 PM.
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Old 6th March 2014, 07:19 AM   #7
oszkar is offline oszkar  Romania
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So basicaly as I understood before as a more upfront to every ones touch, channel separataion is what is brought into question here disregarding technicalities of build, 120db in most cases for the dual mono amplifiers and for a good streo amplifier 110db. I do not know of agreater or less value han 120db for the dual mono type amplifier.
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Old 7th March 2014, 03:09 PM   #8
oszkar is offline oszkar  Romania
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So stereo is sharing one board for L/R that is sent on two separate lines on the board and Dual mono is two boards each with it's transformer feeding it with electricity and delivering sound to left and right, dual mono avoiding cross talk!
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Old 8th March 2014, 06:50 AM   #9
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You could assume that because an amplifier looks to have separate boards for each amplifier, then it must be Dual Mono, but you could be wrong. Many stereo amplifiers are constructed with separate power amplifier boards, just to keep them close to where the heatsinks are located. This is about electrical separation, and it may be achieved just as well on 1 board.

Your second statement is more correct, where you simply suggest that the 2 audio amplifiers and their power supplies are electrically separate. Obviously, that also applies to using 2 separate Mono amplifiers.

For illustrations, you might start by looking at pics of Goldmund amplifiers and check their internal arrangements. They are not always what they seem and of course, there are many hi-end brands that feature this type of construction too.
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Old 8th March 2014, 08:35 AM   #10
oszkar is offline oszkar  Romania
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So in the end as I understand, stereo does dual mono's job in big serries amplifiers from good Trademark names(producers of them) dual mono being the next step up for those who want to have less cross talk for theyr expressive in reproduction, quality build speakers? After this one the next step would be dual mono with separate pre amplifier, power amplifier, let's say Kenwood Basic C2 control amplifier and M2 Power amplifier, separate power blocks with separate pre amplifier and so on!
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