Signal processor in/out

patate91

patate91

Well-Known Member
I just get a luxman r-114 ans I noticed that there are signal processor in and out RCA.

Since the owner manual is not available and this is is the first amplifer that I have that has them I don't know what's their uses.

Can I use it to plug an equalizer? Instead if using tape input?
 
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Yes, it is better than between pre amp and power amp and similar to the tape input/output but makes using an eq or other signal processor easy.
 
EngineerNate said:
That makes sense as it functions nearly the same as the more typical pre-out + main in setup.. ;)
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Yes and no. These are a constant line level and are unaffected by any settings on the pre-amp aside from input selection. It's more like a tape monitor loop in that respect.
 
the skipper said:
Yes and no. These are a constant line level and are unaffected by any settings on the pre-amp aside from input selection. It's more like a tape monitor loop in that respect.
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I just meant that it's a fixed spot in the signal chain where you can hook up an external processing device and pipe the signal back into the pre without needing settings on the preamp to do it.

Speaking of which, with a tape loop, do you have too switch it on to use it? I've never actually used one.

I'm assuming it's better than the pre in/out because being fixed line level reduces the chances of overloading the inputs on the processing device?
 
A tape loop has a switch on the front panel to switch it in or out of the circuit, usually labelled "Tape Monitor Loop" or some such.

An external processing loop (which you have) is in the circuit all the time. The device it's hooked to may or may not have a switch to put in ot out of the circuit.

That line level signal is actually greater than the signal between the pre-amp and the power amp. Generally, a pre-amp attenuates the incoming signal. As such, any noise the external device may generate is buried below the attenuated signal of the input source.
 
the skipper said:
A tape loop has a switch on the front panel to switch it in or out of the circuit, usually labelled "Tape Monitor Loop" or some such.

An external processing loop (which you have) is in the circuit all the time. The device it's hooked to may or may not have a switch to put in ot out of the circuit.

That line level signal is actually greater than the signal between the pre-amp and the power amp. Generally, a pre-amp attenuates the incoming signal. As such, any noise the external device may generate is buried below the attenuated signal of the input source.
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I think you mean what the OP has. ;)

So basically by maintaining full line level you maximize the SnR. Got it. :)
 
the skipper said:
An external processing loop (which you have) is in the circuit all the time.
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Not necessarily. Most usually it's indeed non-switchable, but I also know some switchable ones (most so on Sony models (like for example the TA-F730ES), there usually called "adaptor"). What I haven't yet seen would be a processor loop that wasn't the last loop in the series or one that would be included in the tape copy functions, but maybe there are exceptions for that, too...

Greetings from Munich!

Manfred / lini
 
lini said:
Not necessarily. Most usually it's indeed non-switchable, but I also know some switchable ones (most so on Sony models (like for example the TA-F730ES), there usually called "adaptor"). What I haven't yet seen would be a processor loop that wasn't the last loop in the series or one that would be included in the tape copy functions, but maybe there are exceptions for that, too...

Greetings from Munich!

Manfred / lini
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You are correct. My NAD's is switchable but the unit in question has jumpers*, not a switch. Perhaps I should have said "the" or "this" instead of "an". Dose that satisfy you?

* see post 5
 
t_s: Not really - 'cause at the moment I feel a craving for a big iced coffee, but I guess that's another matter. :D However, that aside, yup, it does.

Greetings from Munich!

Manfred / lini
 
Tape in and out levels differ from from pre-amp out and amp in levels. Good processor loops isolate the inputs from deterioration possibly introduced from incompatible EQ's Filters, Expanders, compressors also while maintaining low distortion and high signal to noise which can be easily compromised some times when tape output circuits and input circuits don't use buffer amps. .
 
The difference between an EPL and a Tape Loop is the EPL is just in line, at the line level as discussed above before the controls of the preamp section volume, balance, bass, treble etc, but it is almost always stand alone and not able to participate in the Tape Dubbing that many 2 tape monitor control units have. The means the EPL is just the addition of that processor, not a flexible location to allow it to be put into the tape output if one were wanting to process a signal before recording.
 
In preamps that have this feature, the output is after the preamp board, but before the volume control. It basically is parting the waters between preamp board and volume/tone control sections. This is the perfect place to put an EQ.

Most preamps with tape inputs get their levels from the connected device, like a tuner or CD player. In fact, most would work with the preamp off! The tape outputs go into the preamp board, just like any other high level device (again like CD player, FM tuner), with routing being controlled by the tape monitor button.
 
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