ENGLISH in 475a,5350a, 1300a,1600a s uc r t tions reference series
INTRODUCTION CHOOSING A LOCATION AND MOUNTING THE AMPLIFIER THANK YOU for purchasing an Infinity® Reference Series amplifier. In order that we may better serve you should you require warranty service for your new amplifier, please retain your original purchase receipt and read the enclosed warranty information card. Choose a mounting location in the trunk or cargo area where the amplifier will not be damaged by shifting cargo. Amplifier cooling is essential for proper amplifier operation.
ENGLISH APPLICATIONS – 1300a AND 1600a The Reference subwoofer amplifiers are single-channel amplifiers. There are two sets of terminals to make it easy to connect multiple woofers. Either set of (+/–) terminals may be used when connecting woofers. Figure 3. Reference 1300a or 1600a amplifier with two woofer connections. To the right are four application diagrams to help plan your subwoofer system installation. NOTE: For simplicity, Figures 3 and 4 do not show power, remote and input connections.
APPLICATIONS – 475a The 475a can be set up for stereo 4-channel, 3-channel or bridged 2-channel operation, as shown in Figures 5 through 8. To Head Unit Rear Output Figure 5. 475a connected to full-range speakers. Note crossover and channel assignment settings. NOTE: • Minimum speaker impedance for stereo operation is 2 ohms. Minimum speaker impedance for bridged operation is 4 ohms. • Not all possible applications are shown here; e.g.
ENGLISH APPLICATIONS – 475a To Head Unit Sub Output Figure 7. 475a connected in tri-mode to a subwoofer and a pair of satellite speakers. Note crossover and channel assignment settings. To Head Unit Front Output Front Speakers Subwoofer To Head Unit Right Figure 8. 475a connected in bridge mode to a pair of full-range speakers. Note crossover and channel assignment settings.
APPLICATIONS – 5350a The 5350a can be configured for 5-channel or 3-channel operation, as shown in Figures 9 and 10. To Head Unit Front To Head Unit Rear INPUT MODE SWITCH: • Use INT (internal mode) to send a signal from the front and rear inputs to the subwoofer. • Use EXT (external mode) when sending a dedicated signal to the subwoofer inputs; e.g., if your source unit has a subwoofer output. Figure 9. 5350a connected to four satellite speakers and a single subwoofer.
ENGLISH INSTALLATION AND SETUP Refer to the illustrations on the previous pages for control location. Reconnect the (–) negative lead to the vehicle’s battery. Apply power to the audio system and play a dynamic music track. SETTING THE CROSSOVER(S) Determine your system plans and set the crossover-mode switch accordingly. If your system design does not include a subwoofer, set the crossover mode to FULL and skip to “Setting Input Sensitivity.
SPECIFICATIONS 475a • 75W RMS x 4 channels at 4 ohms and ≤1% THD + N • Signal-to-noise ratio: 85dB (reference 1W into 4 ohms) • 90W RMS x 4 channels at 2 ohms, 14.4V supply and ≤1% THD + N • Dynamic power: 117W at 2 ohms • Effective damping factor: 6.3 at 4 ohms • Frequency response: 10Hz – 100kHz (–3dB) • Maximum input signal: 6V • Maximum sensitivity: 100mV • Output regulation: 0.
