QRS Series Amplifiers // Owners Manual
INTRODUCTION Introduction Thank you for purchasing this Cadence QRS Series amplifier. Over the years, the technology used to create audio amplifiers has grown by leaps and bounds. We have tens of thousands of satisfied customers still using our first generation Ultra Drive amplifiers which are more than 19 years old. Our competition is satisfied with just continuing to build the same units year after year without thought for improvement, but not Cadence.
FEATURES Features POWER AND PROTECTION CIRCUITRY: QRS Series amplifiers feature our unique IC controlled protection circuitry. This sophisticated circuit constantly monitors the heat sink internal temperature and various voltages, adjusting the amp automatically and protecting it from dangerous conditions.
Features SUPER CLASS AB AUDIO STAGE PERFORMANCE The audio output section of the QRS Series amplifiers feature Japanese studio grade, high current Bipolar audio transistors. Unlike other manufacturers who use a host of different type of transistors, not originally designed for audio output, i.e.: power supply transistors, motor control transistors to produce the audio signal (you can only imagine what they sound like.) Cadence uses only true audio transistors in the audio section of these amplifiers.
Installation Basics REMOTE TURN ON CONNECTION: The remote turn on connection is located on the barrier strip next to the power and ground connections. This connection is responsible for turning the amplifier on and off with the rest of the system. A smaller gauge wire can be used to make this connection to your radio’s power antenna lead. Should your system not have any turn on leads, you can wire the remote terminal to an accessory lead, which turns on, with your cars ignition.
Installation Basics ADJUSTING THE SYSTEM Once the system is operational, the first thing to do, is set all crossover points to approximate settings. In the case of the basic sub woofer system Low Pass filter crossover at 100 Hz or so. Set the Bass Equalizer controls to 0 dB ( Flat Switch Position.) Now you should set the amplifiers input sensitivity adjustment. The knob accessible on the side of the amplifier marked GAIN adjusts the input sensitivity from 6 Volts to 0.2 Volts.
Mounting and Wiring MOUNTING THE AMPLIFIERS: Choose a convenient mounting location with unobstructed airflow. The QRS series amplifiers feature four mounting tabs located at the amplifiers four corners. Using the supplied screws and grommets, gently mount the amplifier in to position. Do not over tighten the screws.
Mounting and Wiring The QRS Series amplifiers are supplied with built-in fuses, never replace the fuse that the amp came with, with one of a larger value. We suggest you construct a Red wiring harness with 2 additional fuses. One fuse should be located near the car battery. This fuse near the battery offers protection against damage from short circuits to the car chassis between the battery and the amplifier. A second fuse closer to the amplifier offers additional safety to the amplifier itself.
FEATURES 4 Channel Amp Clone Features (Q3000, Q4000) The Q3000 features a unique CLONE FUNCTION to assist in setting up a 2-channel bridged system with perfect gain and crossover tracking between the speakers. Typically when setting up a system you would need to set up channels 1 - 2 and then channels 3 - 4 crossovers and gains separately not guaranteeing perfect balance or frequency cutoffs.
4 Channel Amp with 2 C hannel Input (Q3000, Q4000) If your head unit has only one pair of Left and Right RCA out put jacks, plug them in to RCA input Jacks 1 and 2 of the amplifier. The amplifier preamp circuit will automatically mix the signals to channels 3 and 4 thereby preserving your Left and Right Balance control but with no Fade control Front to Rear.
4 Channel Amp with 4 C hannel Input (Q3000, Q4000) If your head unit has two pairs of RCA output jacks, input Front Left and Front Right to channels 1 and 2. Then attach the rear pre-outs to channels 3 and 4. The pre-amp circuitry will not mix any signals thereby preserving full left to right balance and font to rear fader control. Should your head unit have an additional subwoofer RCA output it would need to be attached to a separate subwoofer amplifier.
Basic 4 Channel Configuration (Q3000, Q4000) Install any combination of speakers independently on all 4 channels being careful not to load any single channel below 2 ohm stereo. For typical 6” x 9” or 6.5” or component speaker installs, set the Crossover Mode Switch to Full Range.
4 Channel Amplifier Bridged to 2 Channels (Q3000, Q4000) When bridging the four channel amplifier, make sure that your final woofer impedance on each bridged channel is no lower than 4 ohms. Set the Crossover Mode Switch to Low Pass and begin by setting the crossover frequency control to 100Hz and tuning from there.
4 Channel Amplifier in 3 Channel Mode (Q3000, Q4000) Channels 1 and 2 should be wired to speakers no lower than 2 ohm loads per channel in stereo. Channel 3 and 4 should be bridged as per the diagram wiring the woofer to Channel 3 positive side (+) and Channel 4 negative side ( – ) terminals. Set the crossover mode switch of Channels 1 and 2 to either Full Range or High Pass, while Channels 3 and 4 should be set to Low Pass.
4 Channel with Mixed Mono (Q3000, Q4000) SUBWOOFER MINIMUM IMPEDANCE 8 OHMS LOW PASS FILTER INDUCTOR CH 1-2 CROSSOVER MODE SWITCH IN HIGH PASS POSITION CH 3-4 CROSSOVER MODE SWITCH IN LOW PASS POSITION FRONT SPEAKERS LEFT SPEAKER 4 OHM RIGHT SPEAKER 4 OHM SUBWOOFER MINIMUM IMPEDANCE 4 OHMS COMPONENT VALUES FOR 6dB PASSIVE CROSSOVER FREQUENCY INDUCTOR CAPACITOR 80 Hz 100 Hz 120 Hz 150 Hz 7.5 mH 6.5 mH 5.
4 Channel with Dual Mixed Mono Configuration (Q3000, Q4000) SUBWOOFER MINIMUM IMPEDANCE 4-8 OHMS LOW PASS FILTER INDUCTOR LEFT SPEAKER 4 OHM RIGHT SPEAKER 4 OHM RIGHT SPEAKER 4 OHM LEFT SPEAKER 4 OHM HIGH PASS FILTER CAPACITORS LOW PASS FILTER INDUCTOR 16 FRONT SPEAKERS SUBWOOFER MINIMUM IMPEDANCE 8 OHMS REAR SPEAKERS ALL CROSSOVER SETTINGS IN THIS MODE SHOULD BE SET TO FULL RANGE. COMPONENT VALUES FOR 6dB PASSIVE CROSSOVER FREQUENCY INDUCTOR CAPACITOR 80 Hz 100 Hz 120 Hz 150 Hz 7.5 mH 6.
5 Channel Input Mode (Q5000) 2 CHANNEL MODE INPUT MODE SET TO 2 CHANNEL 4 CHANNEL MODE INPUT MODE SET TO 4 CHANNEL 5 CHANNEL MODE INPUT MODE SET TO 5 CHANNEL If your head unit has one single pair of RCA outputs, input them in to the amplifier’s Channel 1 and 2 input jacks and set the Input Mode Switch to 2Ch. The amplifier’s preamp circuitry will automatically mix all the channels and output will occur on all 5 channels.
5 Channel Amplifier Speaker Wiring (Q5000) Minimum impedance for channels 1 through 4 is 2 ohm stereo. Channel five minimum impedance is 2 ohm mono capable.
2 Channel Amplifier 2 Ohm / 4 Ohm Stereo (Q2000) CROSSOVER MODE SWITCH IN FULL RANGE LEFT SPEAKER 4 OHM OR 2 OHM RIGHT SPEAKER 4 OHM OR 2 OHM 19
2 Channel Amplifier 4 Ohm Bridged (Q2000) CROSSOVER MODE SWITCH IN LOW PASS SUBWOOFER MINIMUM IMPEDANCE 4 OHMS 20
Monoblock 2 Ohm Amplifiers (Q6000m, Q7000m, Q8000m) The following models: Q6000m, Q7000m, and Q8000m are 2 ohm mono block amplifiers. No matter how many woofers you choose to wire up to these models, the final impedance should not fall below 2 ohms. Please see page 26 and 27 for various speaker impedance configurations.
Monoblock 1 Ohm Amplifier (Q9000m) 1 OHM MINIMUM LOAD 2 OHM SUBWOOFER - OR - 2 OHM SUBWOOFER The Q9000m is a 1 ohm mono block Class D amplifier. No matter how many woofers you choose to wire up to this amplifier the final impedance load should not fall below 1 ohm. Please see pages 26 and 27 for various speaker impedance configurations.
High Level Inputs / Smart Turn On (All Models) High Level Input Many factory radios do not have preamp outputs thus all QRS Series models feature High Level inputs. High Level inputs, also referred to as speaker level inputs, allow you to connect to the factory speaker wires. They are called High Level inputs because they convert the high voltage running through factory speaker wires to one the amplifier can handle.
Specifications 24 Q2000 Q3000 Q4000 Q5000 • Rated Power: 90 Watts RMS @ 4 ohm x 2 • Rated Power: 90 Watts RMS @ 4 ohm x 4 • Rated Power: 125 Watts RMS @ 4 ohm x 4 • Rated Power: 80 Watts RMS @ 4 ohm x 4 + 250 Watts x 1 • Rated Power: 135 Watts RMS @ 2 ohm x 2 • Rated Power: 135 Watts RMS @ 2 ohm x 4 • Rated Power: 190 Watts RMS @ 2 ohm x 4 • Rated Power: 120 Watts RMS @ 2 ohm x 2 + 250 Watts x 1 • 1 x 270 Watts RMS @ 4 ohm Mono Bridged • 2 x 270 Watts RMS @ 4 ohm Mono Bridged • 2 x 380 Watts
Specifications Q6000m Q7000m Q8000m Q9000m • Rated Power: 400 Watts RMS @ 2 ohm • Rated Power: 600 Watts RMS @ 2 ohm • Rated Power: 800 Watts RMS @ 2 ohm • Rated Power: 1200 Watts RMS @ 1 ohm • Rated Power: 300 Watts RMS @ 4 ohm • Rated Power: 400 Watts RMS @ 4 ohm • Bridged Power: 500 Watts RMS @ 4 ohm • Rated Power: 600 Watts RMS @ 2 ohm • Bridged Power: N/A • Bridged Power: N/A • Bridged Power: N/A • Rated Power: 300 Watts RMS @ 4 ohm • Minimum THD at Rated Power: < 0.
Speaker Wiring Chart 4 X DUAL VC 8 OHM SPEAKERS WITH SERIES VOICE COILS, ALL IN PARALLEL 4+4 OHM 4+4 OHM 4+4 OHM 4+4 OHM 2 OHM TO AMPLIFIER 2 OHM SERIES: SINGLE VOICE COIL SPEAKERS PARALLEL: SINGLE VOICE COIL SPEAKERS 4 OHM TO AMPLIFIER 2 OHM 26 2 OHM TO AMPLIFIER 4 OHM 4 OHM
Speaker Wiring Chart SERIES: DUAL VOICE COIL SPEAKERS 8 OHM TO AMPLIFIER PARALLEL: DUAL VOICE COIL SPEAKERS Please note that the minimum impedance load for single Cadence QRS Series Amplifiers is 2 ohm stereo and 4 ohm mono bridged. 4+4 OHM 4+4 OHM 2 OHM TO AMPLIFIER Lower impedance loads will cause overheating and may damage the amplifiers. Do not mix different impedance speakers in series and / or parallel combinations, as unequal power sharing and acoustic outputs will result.
// Features and specifications subject to change and or improvement without notice. Though we tried our best to ensure that this manual is free and clear of errors please don’t hold us responsible for printing errors. // Copyright by Cadence Acoustics LTD. www.cadencesound.
