Lab.gruppen PDX3000, Quick Start Manual, Page: 14 / 27

26 PDX3000 Quick Start Guide 27
Delay/Peak Limiter
C hanne l Lin k
I n Dua l Mono, Bi-Amp 1, and Bi-Amp 2 modes, the Channe l Link virtua l button wi ll appear just above the De l ay and Peak Limiter contro l s. When you c l ick on the
Channe l Link virtua l button, the button wi ll l ight up, and the De l ay and Peak Limiter contro l s for both channe l s wi ll disp l ay identica l va l ues.
D e l a y
T he De l ay function digita ll y s l ows the fi na l signa l output from the amp l ifi er by a programmab l e amount (expressed as either distance or time). T his signa l de l ay he l ps prevent
phase and synchronization prob l ems caused by sound trave l ing through air over l ong distances, e.g., between speaker arrays separated by l ong distances or between a
performance stage and distant sound reinforcement speakers.
T he De l ay contro l s a l so simu l taneous l y disp l ay the amount of signa l de l ay in mi ll iseconds (ms), meters (m), and feet (ft), which can be usefu l if you a l ready know the
precise distance between speakers.
Programming signal delay
1. Program the signa l de l ay by using either of these two methods:
a) Rotate the De l ay virtua l knob c l ockwise unti l you achieve a suitab l e amount of signa l de l ay. T he ms, m, and ft text boxes wi ll each disp l ay equiva l ent va l ues as you
rotate the virtua l knob.
b) T ype a de l ay va l ue direct l y into one of the text boxes be l ow the De l ay virtua l knob (ms, m, or ft, depending on your preference). T he De l ay virtua l knob wi ll rotate
to a position matching the de l ay va l ue you have entered.
2. Choose between 0 ° and 180 ° phase either by c l icking on the Phase virtua l button or by c l icking direct l y on 0 ° or 180 ° direct l y be l ow the virtua l button. When the
Phase virtua l button is engaged, the virtua l button wi ll l ight b l ue and the indicator next to 180 ° wi ll l ight up.
Peak Limiter
T he Peak Limiter he l ps protect your speakers by preventing signa l spikes at the amp l ifi er’s output stage.
T he Peak Limiter contro l s inc l ude a dedicated virtua l knob with matching numerica l disp l ays in dB F S (decibe l s re l ative to fu ll sca l e), Vp (Vo l tage(peak)), as we ll as a
rating in Watts, which appears on l y when you choose an Ohm setting from the Load pu ll down menu.
T he PD X Contro ll er software a l so a ll ows you to see the amp l ifi er’s tota l output as a rating in Watts. T his Watt rating a ll ows you to connect speakers with l ower power
ratings and then adjust the l imiter to match the speakers’ maximum Watt rating.
N o t e : the PD X Contro ll er software does not automatica ll y detect or show the tota l speaker l oad connected to the amp l ifi er.
Contro l s for H o l d and Re l ease times appear near the bottom of the window, each with a matching numerica l disp l ay.
Programming the output limiter
1. Program the output l imiter by using either of these two methods:
a) Rotate the Peak Limiter virtua l knob counter-c l ockwise unti l you find an adequate l imiter setting for your sound system. T he dB F S (decibe l s re l ative to fu ll sca l e)
and Vp (Vo l tage [ peak ] ) text boxes wi ll each disp l ay equiva l ent va l ues as you rotate the virtua l knob.
b) T ype a l imiter va l ue direct l y into one of the text boxes be l ow the Peak Limiter virtua l knob (dB F S or Vp). T he Peak Limiter virtua l knob wi ll rotate to a position
matching the de l ay va l ue you have entered.
2. Choose a Load va l ue from the Load pu ll down menu (none, 2, 4, 8, or 16 Ohms) that matches the tota l combined l oad of a ll speakers connected to the amp l ifier’s
outputs. I f your combined speaker l oad in Ohms does not exact l y match 2, 4, 8, or 16 Ohms, choose the next l ower Ohm setting from the Load pu ll down menu.
When you se l ect a Load setting, an additiona l Watt rating for the l imiter wi ll appear above the Load pu ll down menu.
3. Choose a H o l d va l ue either by rotating the H o l d virtua l knob or by entering a va l ue (in mi ll iseconds) into the matching text box be l ow the knob.
4. Choose a Re l ease va l ue either by rotating the Re l ease virtua l knob or by entering a va l ue (in mi ll iseconds) into the matching text box be l ow the knob.
Mode
Changing amplifier mode
T he amp l ifi er mode can be changed by c l icking on the button for your desired routing option a l ong the l eft-hand side of the window. When you c l ick on a mode
button, the software wi ll l aunch a confi rmation window. C l ick “Y es ” in the confi rmation window to l aunch the new amp l ifi er mode, and the new signa l path wi ll
appear in the disp l ay.
Mode descriptions
D ua l M ono
Dua l Mono mode routes each channe l input, A and B, through comp l ete l y separate para ll e l signa l paths with independent outputs for each channe l . E ach channe l may
be processed with its own unique fi l ter, equa l ization, de l ay, and l imiter settings. T he De l ay and Limit modu l es for A and B can be l inked and programmed with
identica l settings by c l icking on the Channe l Link button be l ow the Mode window.
St ereo
Stereo mode routes the signa l from both the A and B inputs through a sing l e series of DSP modu l es. E ach DSP modu l e processes both the A and B signa l s with identica l ,
l inked settings. T he l inked De l ay and Limit parameters can be contro ll ed from Stereo mode’s conso l idated Channe l A + B contro l window (which disp l ays automatica ll y
when Stereo mode is se l ected).
B i -A m p 1
Bi-Amp 1 mode sp l its the Channe l A input signa l in the X Over DSP modu l e at a programmab l e frequency point, and then routes the resu l ting high and l ow frequency
signa l s through a para ll e l chain of DSP modu l es with independent equa l ization, de l ay, and l imiter settings. T he De l ay and Limit modu l es for the sp l it high and l ow
frequency signa l s can be l inked and programmed with identica l settings by c l icking on the Channe l Link button be l ow the Mode window. I n Bi-Amp 1 mode, Output A
routes l ow frequencies to a l ow-range speaker, whi l e Output B connects to a high-frequency transducer.
B i -A m p 2
Bi-Amp 2 mode operates identica ll y to Bi-Amp 1 mode, except that the signa l s are swapped between Outputs A and B (i.e., Output B hand l es l ow frequencies whi l e
Output A hand l es high frequencies). T he swapped A and B output routing a ll ows the user to quick l y correct reversed high/ l ow speaker connections without having to
physica ll y access the amp l ifi er’s back pane l and manua ll y change the speaker connection.