Lab.gruppen PDX3000, Quick Start Manual, Page: 17 / 27

32 PDX3000 Quick Start Guide 33
6. Applications
Refer to the app l ication documentation avai l ab l e for down l oad at l abgruppen.com.
6.1 Bi-amping
Bi-amping sp l its a mono signa l into upper and l ower frequency bands, and then assigns each frequency band to separate speaker cabinets or separate drivers
within a cabinet. A subwoofer typica ll y takes the l ow frequency range. By sp l itting the signa l this way, the speakers work more effi cient l y, and you can achieve a
c l eaner overa ll sound.
Setting up hardware for bi-amping
1. Run a 4-po l e speaker cab l e with professiona l twist- l ocking connectors from OU T PU T C H A to the subwoofer (the subwoofer receives its l ow-frequency signa l from
Channe l B using po l es 2 + and 2-, whi l e the midd l e and upper frequency ranges use Channe l A via po l es 1 + and 1-).
2. Set the subwoofer into B I AMP I NG mode.
3. Run a 2-po l e speaker cab l e with professiona l twist- l ocking connectors from the subwoofer to the other speaker.
Programming DSP parameters for bi-amping using the front panel
1. Choose the B I AMP2 setting on the Amp Mode screen.
2. Go to the X OV E R screen using the UP/DOWN buttons to set appropriate high/ l ow crossover frequencies.
3. I n Channe l A # 1, choose your high-pass fi l ter type ( H Ptype: BU T 6, BU T 12, B E S12, etc.) and set the cutoff frequency ( H Pfreq) to approximate l y 100 H z. Deactivate
the l ow-pass fi l ter (LPtype: O FF ) on this channe l and set the gain l eve l (Gain) to suit your system.
4. I n Channe l B # 1, choose your l ow-pass fi l ter type (LPtype: BU T 6, BU T 12, B E S12, etc.) and set the cutoff frequency (LPfreq) to approximate l y 100 H z. Deactivate the
high-pass fi l ter ( H Ptype: O FF ) on this channe l and set the gain l eve l (Gain) to suit your system.
Programming PDX Controller Software for bi-amping
1. Se l ect the Configuration tab.
2. Choose the B I AMP2 signa l path in the Configuration tab. A confirmation window wi ll pop up.
3. C l ick “Y es ” on the Amp Mode confirmation window.
4. Se l ect the F i l ter/Crossover tab.
5. Se l ect the X -Over button be l ow the F requency Curve disp l ay. A confirmation window wi ll up up asking if you wish to set a Defau l t Crossover.
6. C l ick “Y es ” in the confirmation window. T he X -Over button wi ll i ll uminate, and defau l t crossover settings wi ll appear in the F requency Curve and Contro l View.
7 . Choose a fi l ter type from either the Low Pass 2 or H igh Pass 3 T ype pu ll down menus (the software defau l ts to a Butterworth fi l ter). Any changes to the Low Pass 2
or H igh Pass 3 settings wi ll a l so automatica ll y appear in both fi l ter’s Contro l View settings.
8. Choose a fi l ter s l ope setting from the S l ope pu ll down menu under either Low Pass 2 or H igh Pass 3 (the software defau l ts to a Butterworth fi l ter). Again, matching
parameters wi ll automatica ll y appear in both fi l ter’s Contro l View settings.
9. Set the crossover frequency by using any of these three methods:
a) Rotate the Low Pass 2 or H igh Pass 3 virtua l F req knobs in the Contro l View. T he crossover frequency disp l ayed in the F req box be l ow the virtua l knob wi ll change
simu l taneous l y for both fi l ters.
b) Se l ect the text box be l ow either F req virtua l knob, and type your desired frequency direct l y into the text box.
c) Go to the F requency Curve disp l ay, c l ick on the frequency l ine marked “ 2, ” and drag the frequency l ine to the desired area of the F requency Curve. Parameter
settings and virtua l knobs in the Contro l View wi ll automatica ll y move and change as you drag the crossover frequency through the F requency Curve window.
10. I f necessary, adjust the Gain settings for Channe l A and Channe l B by rotating the respective Gain virtua l knobs.
Dynamic EQ Control View
T he Contro l View of the Dynamic E Q tab contains virtua l knob contro l s for Gain, T hresho l d, F requency, Q (bandpass fi l ter on l y). E xact parameter va l ues appear in boxes
be l ow each virtua l knob. T hese parameters may be a l tered by either adjusting the virtua l knobs or by entering va l ues direct l y in the parameter boxes.
Pu ll -down T ype menus for each dynamic E Q band contain these additiona l options:
• • BP (bandpass fi l ter)
• •
LP6 ( l o-pass fi l ter, with a 6 dB/Octave s l ope)
• • LP12 ( l o-pass fi l ter, with a 12 dB/Octave s l ope)
• •
H P6 (hi-pass fi l ter, with a 6 dB/Octave s l ope)
• • H P12 (hi-pass fi l ter, with a 12 dB/Octave s l ope)
T he Ratio pu ll down menu off ers four options:
• • 1:2.0
• •
1:3.0
• • 1:5.0
• •
1:10
Gain vs. Ratio
Positive gain settings resu l t in a frequency boost at l ow signa l l eve l s and a near l y fl at E Q response at high l eve l s. Negative gain settings yie l d opposite resu l ts: at l ow
signa l l eve l s, the E Q response is near l y fl at, whi l e higher signa l l eve l s receive increasing amounts of cut from the equa l izer. T he higher the Ratio setting, the more the
equa l izer wi ll cut or boost the signa l at diff erent signa l l eve l s.
Programming a dynamic EQ
1. Choose an E Q type from the T ype pu ll down menu.
2. Set the dynamic E Q’s band frequency by rotating the F requency virtua l knob. T he programmed frequency can represent either the center frequency for band-pass
(BP) mode, or the thresho l d frequency for l ow- (LP) and high-pass modes ( H P).
3. F or band-pass BP mode, contro l the width of the band-pass curve by rotating the Qua l ity virtua l knob parameter. H igh Qua l va l ues produce a narrow, steep curve,
whi l e l ow Qua l va l ues create a wide curve with a gent l e s l ope.
4. Set the dynamic E Q’s band cut or boost by rotating the Gain virtua l knob.
5. Set the signa l thresho l d by rotating the T hresho l d knob.
6. Program your desired ratio by se l ecting from the Ratio pu ll down menu. Simi l ar to a compressor, higher ratio va l ues yie l d a more intense equa l ization effect.
7 . Adjust the attack (Attack) and re l ease (Re l ease) va l ues by rotating each parameters respective virtua l knob.