DB Research speed Series

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Overview

Function Description
Important Technical Specifications
Usage Features
Maintenance Features

The DB Drive Speed Series Amplifiers are a range of car audio amplifiers designed to enhance the sound system in a vehicle. The series includes models SPA8.4, SPA6.1M, SPA12.1D, and SPA15.1D, each offering different power outputs and configurations to suit various audio setups. These amplifiers are built with several protection circuits and features to ensure reliable operation and high-quality sound reproduction.

Function Description

The primary function of these amplifiers is to boost the audio signal from a head unit (car stereo) to drive speakers with greater power and clarity. They are designed to deliver a robust audio experience, whether for full-range speakers or subwoofers. The amplifiers incorporate various features to optimize sound quality and system integration within a car audio environment.

Important Technical Specifications

The Speed Series offers a range of power outputs and impedance stability:

SPA8.4: A 4-channel amplifier stable at 2 Ohm Stereo.
- Peak @ 14.4V: 4 x 80 W (4 ohms), 4 x 160 W (2 ohms).
- Frequency Response: 15Hz - 40KHz.
- S/N Ratio (A-weight): >95dB.
- THD (1KHz, 4 ohms): <0.5%.
- Lowpass Filter: 50Hz - 4KHz.
- Highpass Filter: 15Hz - 4KHz.
- Bass EQ: 45Hz @ 0-6dB-12dB.
- Input Voltage: 12.0VDC to 14.8VDC.
- Dimensions: 12.99" / 330mm (Length), 2.17" / 55mm (Height), 9.37" / 237mm (Width).
SPA6.1M: A mono amplifier stable at 2 Ohm Mono.
- Peak @ 14.4V: 1 x 300 W (4 ohms), 1 x 600 W (2 ohms).
- Frequency Response: 18-250Hz.
- S/N Ratio (A-weight): >95dB.
- THD (1KHz, 4 ohms): <0.4%.
- Lowpass Filter: 50Hz - 150Hz.
- Subsonic Filter: 15Hz - 40Hz.
- Input Voltage: 12.0VDC to 14.8VDC.
- Dimensions: 12.99" / 330mm (Length), 2.17" / 55mm (Height), 9.37" / 237mm (Width).
SPA12.1D: A mono amplifier stable at 1 Ohm Mono.
- Peak @ 14.4V: 1 x 600 W (4 ohms), 1 x 1200 W (2 ohms), 1 x 2400 W (1 ohm).
- Frequency Response: 18-250Hz.
- S/N Ratio (A-weight): >95dB.
- THD (1KHz, 4 ohms): <0.4%.
- Lowpass Filter: 50Hz - 150Hz.
- Subsonic Filter: 15Hz - 40Hz.
- Input Voltage: 12.0VDC to 14.8VDC.
- Dimensions: 14.49" / 368mm (Length), 2.17" / 55mm (Height), 9.37" / 237mm (Width).
SPA15.1D: A mono amplifier stable at 1 Ohm Mono.
- Peak @ 14.4V: 1 x 750 W (4 ohms), 1 x 1500 W (2 ohms), 1 x 3000 W (1 ohm).
- Frequency Response: 18-250Hz.
- S/N Ratio (A-weight): >95dB.
- THD (1KHz, 4 ohms): <0.4%.
- Lowpass Filter: 50Hz - 150Hz.
- Subsonic Filter: 15Hz - 40Hz.
- Input Voltage: 12.0VDC to 14.8VDC.
- Dimensions: 16.42" / 290mm (Length), 2.17" / 55mm (Height), 9.37" / 237mm (Width).

All models feature adjustable input sensitivity (20mV - 5.0V RMS for mono amps, 20mV - 3.0V RMS for 4-channel), power fusing for protection, and remote turn-on capability. The mono amplifiers (SPA6.1M, SPA12.1D, SPA15.1D) also include a variable 24dB Slope Lowpass crossover network and a 24dB slope subsonic filter. They feature a variable Bass Boost EQ at 45Hz and a Phase Shift feature (0 or 180 degrees). The SPA8.4 (4-channel) features a selectable 12dB slope crossover network for Highpass and Lowpass/Bandpass settings.

Usage Features

Installation Flexibility: The amplifiers can be mounted in various locations within a vehicle, such as the trunk or under the seat, provided there is adequate ventilation. Caution is advised during mounting to avoid damaging existing vehicle wiring, gas lines, or the fuel tank.
Power Connections: Requires a direct connection to the car's battery using a 4 to 8 gauge power wire, depending on the amplifier and wire length, with an in-line fuse within 12 inches of the battery for protection. A ground connection to the car's chassis using a short 4 to 8 gauge wire is also necessary. A remote turn-on wire connects to the head unit's remote output or power antenna wire, allowing the amplifier to turn on and off with the stereo.
Signal Connections: RCA outputs from the head unit connect to the amplifier's RCA input terminals. High-quality RCA cables are recommended, and signal wires should be run away from electrical wires to prevent noise.
Adjustable Input Sensitivity: Allows users to fine-tune the level matching between the source unit and the amplifier, optimizing sound quality and preventing distortion.
Crossover Network:
- SPA8.4 (4-Channel): Features a selectable 12dB slope crossover network. Channels 1 and 2 can be set for Highpass, while Channels 3 and 4 offer Highpass, Lowpass, or Bandpass settings with 12dB or 24dB slopes. This allows for precise frequency filtering to match different speaker types (e.g., full-range, tweeters, subwoofers).
- SPA6.1M, SPA12.1D, SPA15.1D (Mono): Equipped with a variable 24dB Slope Lowpass crossover network and a 24dB slope subsonic filter. These are crucial for optimizing subwoofer performance by filtering out unwanted high and ultra-low frequencies.
Bass Boost: Mono amplifiers include a selectable 6dB-12dB bass boost at 45Hz for enhanced low-frequency performance, allowing users to tailor the bass response to their preference and enclosure characteristics.
Phase Shift (Mono Amplifiers): Allows adjustment of the subwoofer signal to 0 or 180 degrees, which helps fine-tune the subwoofer enclosure and achieve optimal bass integration with other speakers.
Multi-Linking Technology (Mono Amplifiers): Enables two identical mono amplifiers to be linked together for increased power output. One amplifier is designated as the "Master" (receiving the main RCA input and controlling all settings), while the other is the "Slave" (with its front panel controls becoming inoperative). Signal transfer between linked amplifiers is managed via a Data-link cable.
Speaker Connections: Supports various speaker configurations. Mono amplifiers provide two sets of speaker terminals connected in parallel internally for ease of connecting multiple woofers. Proper phasing (positive to positive, negative to negative) is essential for strong bass response.
Remote Bass Control Module: An optional module that allows convenient adjustment of the bass level from the driver's seat.

Maintenance Features

Protection Circuits:
- DC Offset Protection: Shuts down the amplifier if DC voltage is detected at the output stage, protecting speakers from damage.
- Short Circuit Protection: Activates if a short is detected in the speakers or wiring, shutting down the amplifier. Normal operation resumes once the problem is corrected and the head unit is cycled off/on.
- Thermal Protection: Engages if the amplifier reaches excessively high operating temperatures, allowing it to cool down. The amplifier automatically restarts once a safe temperature is reached.
- Power Fusing: Protects the amplifier against short circuits and excessive current.
Troubleshooting Guide: The manual provides a comprehensive troubleshooting section to help users diagnose and resolve common issues such as no output, blown fuses, RCA cable problems, ground loops, engine noise, and speaker shorts. This guide helps identify problems related to power, signal, and speaker connections.
Warranty: DB Drive offers a limited warranty for products purchased from an authorized dealer in the U.S.A. A two-year warranty covers defects in material and workmanship under normal use and service if installed by an authorized dealer. Non-authorized dealer installations carry a one-year warranty. The warranty applies to the original purchase only and covers repair or replacement. It does not cover misuse, abuse, neglect, accident, or unauthorized alterations. For warranty service, customers are advised to contact their retailer or visit the DB Drive website.
Continuous Improvement: DB Drive notes that specifications are subject to change without notice due to continuous product improvement, indicating ongoing efforts to enhance product quality and performance.