Owner`s manual

a tubby, indistinct attack and slow the response. A basic rule might be this; As the GAIN goes up…the BASS should come down.

• Beware of setting the EQ SLIDERS to extremes when using the Channel 1 FAT Mode. Be especially careful of the 80Hz and 240Hz,

as these two can dump excessive amounts of low frequencies into the mix. This, combined with the high gain settings of this Mode,

can cause ﬂub and mud in the sound and could possibly even damage some low wattage speakers if played at very high volumes.

• Speaker Impedance has a sonic effect on the sounds as the MARK FIVE: 25 power section is switched between its two different

Modes. We prefer a matching 8 Ohm speaker load connected to the 8 Ohm SPEAKER OUTPUT for the most balanced sound and

overall performance. A 4 Ohm Load will work ﬁne, but will usually sound a little “softer” and more scooped with less “punch” in the

midrange frequencies.

• You can safely experiment with different load combinations in the high direction, for example an 8 Ohm Speaker Cabinet connected

to the 4 OHM SPEAKER OUTPUT jack on the MARK FIVE: 25, or a 16 Ohm Cabinet on the 8 OHM SPEAKER OUTPUT. You can’t

hurt your ampliﬁer loading it in that direction and you may discover an impedance scenario that, though a technical “mismatch”,

produces a unique response that ﬁts your needs. The only penalty might be that your power tubes may wear a bit faster with mis-

matched load conditions and you won’t achieve the ampliﬁer’s maximum headroom (full power output). Do Not use an impedance

mismatch in the low direction (example: a 2 Ohm Load on a 4 Ohm SPEAKER Output) as this is very hard on the Output trans-

former and may cause damage to the ampliﬁer.

• Because the MARK FIVE: 25 is a lower wattage ampliﬁer, and therefore you will likely be hearing more of the power section (and

it’s overdrive effect) than you might when using say a 50 or 100 watt amp, you may want to try setting the preamp GAIN Control in

the Channels a little lower than you are typically used to doing. This may help you retain more attack and fundamental punch in

the sound and keep things tight and focused. This little MARK has immense preamp gain available and it may not be necessary

to use higher amounts of it all the time to achieve the best sounds and performance.

• When reaching over the top of the ampliﬁer from the Front, the REVERB Controls are in the center of the Rear Panel with Channel

1’s REVERB Mix on the left and the REVERB for Channel 2 just to the right.

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