Controls – Mesa/Boogie pmn User Manual

Page 11

MASTER:

This control is the master feed from the end of the pre-amp to the driver stage and the Effects Loop. As you can

see each Channel is ﬁ tted with its own

MASTER Control, enabling the two channels relative volumes to be matched regardless of

their extremely different sound styles and gain signatures. The

MASTER Control makes possible a wide range of sounds through

its ability to use very low

Gain sounds at high volumes and conversely, high Gain sounds at low volumes

and everywhere between.

Again, we suggest using the

MASTER Control in its sensible ranges ( 9:00 - 2:00 ). Here, the channels will

sensible

be easier to match with each other and the Effects Loop will see more reasonable signal levels.

NOTE: Because the MASTER Control creates the send to the Effects Loop, extreme settings will cause
a large signal to be sent to the Loop for that Channel. Not only may this cause possible overloading of the
processors Input stage, but will make balancing the two channels’ Effect Send level difﬁ cult.

OUTPUT:

This control determines the overall output volume level of the ampliﬁ er. After the GAIN Controls have been set for the

desired sound style and the two channels levels have been balanced with the channel MASTER Controls, the

OUTPUT Control

allows you to change the playing level by adjusting a single control. The

OUTPUT Control is also wired as the Effects Loop Return

Level Control. Should you ever use your RECT-O 50 ampliﬁ er as a power amp alone by inserting a signal into the RETURN jack,

the

OUTPUT Control will serve as the master level control.

NOTE:

NOTE: When using the EFFECTS RETURN as an input - to use the RECT-O ampliﬁ er as a power amp

- the SOLO Control can be used to attain a footswitchable boost if the Footswitch is connected. It is wired in
parallel to the

OUTPUT Control and therefore also controls the volume of the power section.

OUTPUT

NOTE:

NOTE: The Effects Loop RETURN jack can serve as a power amp input so that you may use the RECT-O

The Effects Loop RETURN jack can serve as a power amp input so that you may use the

50 ampliﬁ er as a power amp for either stereo reproduction or to incorporate additional pre-amps. Here are

a few things to remember that will help you when interfacing to the RECT-O for use as a power amp only;

1.) Connect “Dummy” plug or loose cable to SEND jack. ( This prevents any possible loading that could result in diminished RETURN
sensitivity.)

2.) The OUTPUT Level will be the only active control on the Front Panel (the PRESENCE Control of Channel 1 will be active only
when that channel is engaged - see #3 )

3.) The SOLO Control may be used to footswitch to a pre-determined amount of boost when the footswitch is connected.

4.) Channel 2’s MODERN mode - as part of its voicing - utilizes substantially less negative feedback in the power stage creating a
scenario of greatly increased power sensitivity. This internal revoicing produces amazing results in the lead sounds and requires a
sophisticated network of elements to switch to prevent the increased power sensitivity from blowing you out of the room as Channel
2’s RAW & MODERN modes are toggled between.

Therefor, we recommend selecting Channel 1 when you wish to use the RECT-O as a power amp. The more conventional power

RECT-O

sensitivity of this channel will be the most compatible with external sources. Also, using Channel 1 in a power-only application means
that the PRESENCE Control will be active which allows you to tailor the power voicing to your speciﬁ c tastes. If you do need the extra
sensitivity that Channel 2’s MODERN mode produces for a source that is unusually weak, it is there if you need it. The PRESENCE
Control will not have any effect on the sound as it switches with the mode change to an earlier stage in the pre-amp.

5.) The EFFECTS MIX Control must be set to 90%.

CONTROLS:

(Continued)

PAGE 7

HEAD VERSION

PRESENCE

MASTER

SOLO

OUTPUT

HEAD VERSION