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JM-1

Joined: 30/09/07
Posts: 604

Effects Loop position in relation to Master Volume
#961078 - 30/12/11 07:22 AM

I've been looking at some of the Ceriatone amps which have the FX loop positioned after the Master Volume. Logically therefore, if you turn up the Master Volume during a gig, you'd be sending a hotter signal to the FX loop (and will then need to turn down the FX send).

Is this a practical problem? I always believed that the loop was positioned between the preamp gain and the master volume - so after you set up the FX loop levels, you could later adjust the master volume to taste. Though obviously if you step on a Overdrive pedal, of course you'd heat up the signal going to the loop...!

Am I missing something?

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ef37a

Joined: 29/05/06
Posts: 5622
Loc: northampton uk

Re: Effects Loop position in relation to Master Volume new

[Re: JM-1]
#961099 - 30/12/11 11:40 AM

FX loop provision on guitar amplifiers is not an exact science!

Many use indeterminate levels, send and return impedances are all over the shop and, as you have seen, they are not always put in the most sensible part of the circuit!

Back in the day when all we had was valves, providing a low Z send cost another valve and that was a fair percentage of the build cost. Today a TL072 serves for pence. (I know there are purists who will not counternance silicon to any degree in their amps, they are daft IMHO and either very poor now, or very rich!)

So look for amps with "proper" FX loops and that really means ones with -10/+4 switching to boot.

Dave.

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JM-1

Joined: 30/09/07
Posts: 604

Re: Effects Loop position in relation to Master Volume new

[Re: JM-1]
#961312 - 31/12/11 02:14 PM

So Dave with the following scenario:

- Amp with post Master Volume un-buffered loop

- External buffer with send and return level controls (e.g. below)

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Then the final volume control on the external buffer (Return / Recovery) would then become an effective Master Volume, right before going back into the amp's phase invertor. Would that be correct?

Regards
Jay

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