dV-DOSC dV-SUB Manual V3.0 June 2005 37
1.6 POWERING dV-DOSC
L-ACOUSTICS LA24a or LA48a power amplifiers are specified for use with dV-DOSC. For full
technical details please see the LA24a or LA48a user manuals (available for download on:
www.l-
acoustics.com). Both amplifiers have 32 dB gain and the input sensitivities are 1.95 Vrms (8.0 dBu) and
2.3 Vrms (9.5 dBu) for the LA24a and LA48a, respectively.
dV-DOSC is an active 2-way enclosure and the load ratings are as follows:
1 x 8 ohms high section
1 x 8 ohms low section (2 x 16 ohm 8” components connected in parallel)
According to standard L-ACOUSTICS specification practice, minimum power amplifier output ratings
are defined as twice the RMS power rating for the low section and equal to the peak power rating for
the high section. Power handling for dV-DOSC (single and multiple enclosures in parallel) and
recommended power amplifier ratings are summarized in Table 3.
Table 3: dV-DOSC Power Handling and Recommended Power Amplifier Ratings
ONE dV-DOSC TWO dV-DOSC THREE dV-DOSC
SECTIONLOADRMSPEAKREC'DLOADRMSPEAKREC'DLOADRMSPEAKREC'D
dV LOW 8 380 1520
760
4 760 3040
1520
2.7 1140 4560
2280
dV HIGH 8 66 260
260
4 130 520
520
2.7 200 800
800
dV-DOSC LOW SECTION AMPLIFIER OUTPUT POWER dV-DOSC HI SECTION AMPLIFIER OUTPUT POWER
REC'D POWER (MLS SETTING) REC'D POWER (MLS SETTING)
LOAD REC'D LA 17a LA 24a LA 48a LOAD REC'D LA 17a LA 24a LA 48a
(ohms) POWER (ohms) POWER
2.7 2280 1080 1635 2130 2.7 800 1080 1000 1380
do not use (0 dB)
(-2 dB) (0 dB) (-5 dB) (-5 dB)
4 1520 840
1500 1600
4 520
840 600 830
do not use (0 dB) (-2 dB) (0 dB) (-5 dB) (-5 dB)
8 760 430 1100 820 8 260 430 300 430
do not use (0 dB) (-2 dB) (0 dB) (-5 dB) (-5 dB)
Note: Power handling for the dV-DOSC low section depends on the selected high pass filter frequency for a
given preset (80 Hz, 100 Hz, 120 or 200 Hz). Limiter settings are adjusted in the OEM factory presets to
account for this.
As seen in Table 3, the LA24a is suitable for powering up to 2 dV-DOSC while the LA48a is
recommended for powering 3 enclosures in parallel. Tables 4 and 5 give a cross reference of L-
ACOUSTICS LA24a and LA48a power amplifier ratings and MLS switch settings for powering dV-
DOSC. For system protection via power matching, recommended MLS switch settings are indicated
in bold italics and bold for the low and high sections, respectively. For touring applications, LA24a and
LA48a amplifiers can be operated with MLS switches in the 0 dB position and system protection
provided by OEM factory preset limiter settings which are calibrated to 2x the RMS power handling
for each section. For fixed installations it is recommended that the MLS switch settings tabulated in
Tables 4 and 5 are used.
When the L-ACOUSTICS RK124a is equipped with 4 L-ACOUSTICS LA48a power amplifiers, a single
power amplifier rack can power: 3+3+3+3 dV-DOSC, 4+4 dV-SUB or SB218, 8+8 SB118.
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