Quantum QT600 manual Punch, Bass Shape, Mid Boost, High Mid, Treble, Low Mid, HF Character

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Quantum QT 600 Manual

2.2 Punch

Pushing the PUNCH button activates a filter in front of the EQ whose curve is shaped like that of a tube amp set up to deliver clean sounds – the result is punchier and more lively sound.

The PUNCH filter’s frequency response is tweaked to ensure that there is no audible change in overall level.

The figure shows the curve of the pre-filter with the PUNCH button activated

2.3 Bass

Turning this knob up boosts frequencies ranging from 40 to 200 Hz (with a centre frequency of 60 Hz), while scooping mids from 300 to 600 Hz. This emphasizes low-end frequencies. Turning the knob down suppresses the low-end, raises the lower of the two limiting frequency and boosts frequencies at 100 Hz. The overall energy of the bass is maintained even when cutting frequencies.

The figure shows the BASS EQ’s curve when boosting (upper curve) and cutting (lower curve) frequencies

2.4 Bass Shape

Turning on the BASS SHAPE knob activates a low cut filter at 80 Hz with an edge steepness of 12dB in the bass band. Energy-consuming sub-bass signals are filtered out, giving the amp and speaker more room to breathe. Boosting to between 80 Hz and 160 Hz shifts a portion of the energy one octave higher, which has a particularly positive effect in problematic stage situations involving bass drums.

The figure shows the filtering curve with

BASS SHAPE activated

2.6 Mid Boost

Activating the MID BOOST knob boosts a broad range of frequencies around 220 Hz. This pre-filtering is excellent for classic soul sounds.

The figure shows the filtering curve with

MID-BOOST activated

2.7 High Mid

As with LOW MID, frequencies are boosted in a broad band and cut in a narrow band. The centre frequency is 800 Hz. This frequency range is responsible for the “woody“ quality of the signal-boosting results in a pleasant, woody tone.

The figure shows the HIGH MID EQ’s curve when boosting (top curve) and cutting (bottom curve) frequencies

2.8 Treble

The TREBLE control has two functions. When the HF CHARACATER button is deactivated, it works just like a classic level control, producing a rather “metallic“ sound. The character of the frequency processing is emphasized by dampening frequencies lying above the TREBLE control range’s centre frequency.

When the HF CHARACTER button is activated, it works just like a tube power amp’s presence control, producing delicate, soft top- end frequencies while simultaneously rolling off “harsher” sounding frequencies found at the low end of the high frequency range. Pushing the PUNCH button audibly enhances the effect of the TREBLE control.

The figure shows the TREBLE-EQ’s curve when boosting (top curve) and cutting (bottom curve) frequencies

ENGLISH

2.5 Low Mid

Turning this knob up boosts a broad range of frequencies neighbou- ring the centre frequency of 400 Hz, adding presence and punch to the bass signal. Turning this knob down filters out a narrow range of frequencies around 400 Hz.

The figure shows the LOW MID EQ’s curve when boosting (top curve) and cutting (bottom curve) frequencies

2.9 HF Character

Pushing the HF CHARACTER button activates a filter over the EQ whose curve is similar to that of a “soft” tweeter. The effect is parti- cularly prominent in the high-end response of basses with active circuitry. With passive basses (or instruments whose strings are old) this effect may barely be audible because there are few high-range frequencies in the instrument’s signal.

The figure shows the pre-filter curve with

HF CHARACTER activated

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