Velodyne DIGITAL DRIVEPLUS DD-15+ User Manual - Installation
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SPL-800i User’s Manual - 3
INSTALLATION
Inputs
your new subwoofer is equipped with speaker-level and line-level inputs. Use the lIne leVel jacks when
connecting your subwoofer to a preamp, signal processor, line-level crossover or receiver with pre-amp level
outputs.TheSPEAKERLEVELjacksconnectdirectlytothespeakeroutputsofanyamplifier,integratedamplifier
orreceiver.Youramplifiersectionwillnoticenoadditionalloadingeffectswhenyouusetheseinputsduetotheir
very high impedance.
Important!!! Do not use any of the LINE LEVEL, SPEAKER LEVEL, and MINI-JACK connections
simultaneously!
Volume Control
Thiscontrolallowsyoutobalancetheoutputfromthesubwoofertothemainspeakers/amplifierinyoursystem.
This control should be set to achieve similar output level from both the main speakers and subwoofer when
listening to music. A good starting point for the volume control is 3 or 4 dots from minimum.
Low-pass Crossover - 40 to 120 Hz
All inputs sum the left and right channels together, with the resulting signal passing through an adjustable
low-passcrossoverbeforebeingamplified.Thecrossovercontrolallowsyoutoadjusttheupperlimitofthe
subwoofer’sfrequencyresponsefrom40to120Hz.Thesubwoofer’sresponsewillbeginrollingoffabovethe
frequency you set this control to. you should set the crossover frequency to obtain a smooth and seamless
transition from the subwoofer to the main speakers in your system. If your main speakers are smaller units with
limitedlowfrequencyoutput,youmaywishtochooseahigherfrequency(suchas100-120Hz)thanyouwould
with larger speakers which have P greater low frequency output. with larger speakers, you might start with this
controlsetlower,suchas80Hz.
Abypassswitchisalsoprovidedifyouwishtouseanexternalcrossover.Ifyouarenotusinganexternal
crossover, we recommend that you use the one provided within the unit for optimum performance!
Phase Adjustment - 0°/180°
Thiscontrolallowsyouto“reverse”thephaseofthesubwoofer’soutputsignal180°tocorrectforanypossible
mismatchandresultingcancellationbetweenthesubwooferandyourmainspeakers/amplifier.Toadjust,simply
listen to the system with music playing. Then move the switch from one position to the other and listen for a
change in low frequency output. The correct position will have a greater amount of apparent low frequency
output.
Crossover Switch - INTERNAL X-OVER/SUBWOOFER DIRECT
This switch allows the internal crossover circuitry to be removed from the signal path. This is required in certain
installationswhichroutethesignalthroughexternalprocessorswithacrossovercircuitoftheirown,suchasthe
new digital units. Simply move the switch to SUBWOOFER DIRECT to disengage the built-in crossover. For all
other installations which do not have a separate electronic crossover, we recommend you leave the switch set
to INTERNAL X-OVER to provide optimum performance.