Adjustments and Settings, Fine Tune the System

ADJUSTMENTS AND SETTINGS

The “Speed Series” amplifiers are equipped with built-in variable crossover networks allow- ing you to select the crossover mode (i.e. Low-Pass/Full/High-Pass or On/Off) and the desired crossover point. For example if you wish to drive a pair of subwoofers, you can select the “Low Pass” setting on the amplifier to filter out high frequencies. This will send only low frequencies to your subwoofers (see example settings below). The crossover point should be determined by the speakers operating range. Please refer to speaker manufac- tures recommended crossover point.

Filter selection for channel 1 & 2		Filter selection for channel 3 & 4
Adjust the frequency to the			Adjust the frequency to the
desired point for speakers 1 & 2.			desired point for speakers 3 & 4.
Bass Boost @ 45Hz			Bass Boost @ 45Hz
Bass Boost @ 45Hz			*0~18dB Channels 3 & 4
*0~18dB Channels 1 & 2			*0~18dB Channels 3 & 4
*0~18dB Channels 1 & 2			Only in Lowpass
Only in Lowpass			Only in Lowpass
Only in Lowpass
	input		remote
	ch 1	ch 3	remote
x-over	ch 1	ch 3	x-over
x-over			x-over
low full high		low full high
0dB 18dB 60Hz 400Hz	min max	min max	60Hz 400Hz 0dB 18dB
bass freq	input	input	freq bass
boost	level	level	boost
	ch 2	ch 4	spa150.4
			spa150.4
			classAB 4 channel amplifier

FINE TUNE THE SYSTEM

Fine tune the amplifier’s input sensitivity

The gain sensitivity control for the “Speed Series” amplifier is located on the side panel. This gain control has been included to allow adjustment to properly match the output of the radio. This is one of the most misunderstood adjustments. By rotating the control in the clockwise direction, the amplifier’s input will become more sensitive and the music will play louder. This is not a volume control and you will not get more power out of the amplifier in the maximum position! It may seem to deliver more output, but actually the system is only playing louder faster as you turn the volume control on the radio. Ideally, to properly level match the system the goal is to achieve maximum output from the amplifier without distor- tion at about ¾ of the volume control.

To determine if the amplifier’s gain is set properly, turn the system on and slowly increase the volume control. You should be able to use about ¾ volume before the system gets loud but not distorting. It is very important when making these adjustments that you do not over drive the speakers (at point of distortion) this will cause permanent damage to the speakers. If you are unable to achieve ¾ volume before distortion you will need to adjust gain control (in this case you would reduce the gain). The gain controls should be adjusted very slowly. It may help to have another person to assist you by adjusting the gain controls while you listen for distortion.

Input Level

Min Max

SPA1300D, SPA1900D, SPA1000D, SPA90.2, SPA1600D specifications

DB Drive is renowned for its high-performance audio amplifiers, and the SPA series exemplifies this reputation. The SPA90.2, SPA150.4, SPA1000D, SPA1300D, and SPA90.4 are notable models that deliver robust power, innovative technologies, and superior sound quality, catering to the needs of audio enthusiasts and professionals alike.

The SPA90.2 is a compact yet powerful 2-channel amplifier that produces up to 90 watts per channel at 4 ohms. It features high-level inputs, allowing seamless integration into existing audio systems without requiring external converters. This model is designed with enhanced thermal management to ensure reliability even during extended use.

Next, the SPA150.4 is a versatile 4-channel amplifier, rated at 150 watts per channel at 4 ohms. It includes various crossover options, allowing users to fine-tune their sound experience, whether powering speakers or subwoofers. This model integrates a low-pass filter that enhances bass response for a more immersive listening experience.

The SPA1000D is a dedicated monoblock subwoofer amplifier that produces a staggering 1000 watts RMS at 1 ohm. It is designed with advanced Class D technology, ensuring high efficiency and low thermal output. The variable low-pass filter and phase control features allow users to optimize subwoofer performance, making it ideal for deep bass enthusiasts.

On the other hand, the SPA1300D is another monoblock amplifier that delivers an impressive 1300 watts RMS, also at 1 ohm. It includes a bass boost feature, which lets users amplify bass frequencies for an impactful low-end experience. The SPA1300D is built with a heavy-duty aluminum heat sink for efficient dissipation of heat, ensuring sustained performance.

Finally, the SPA90.4 combines power and versatility, offering 90 watts per channel across its four channels. Its bridgeable design allows users to create a more powerful two-channel output when needed. The SPA90.4 employs advanced circuit protection technology, ensuring longevity and safety in various sound setups.

In summary, the DB Drive SPA series of amplifiers provides powerful audio solutions with advanced technologies, including Class D efficiency, various crossover options, and extensive circuit protection features. Each model caters to different audio needs, from compact setups to powerful subwoofer configurations, making them a perfect choice for both casual listeners and serious audiophiles.

DB Drive SPA150.4, SPA90.4, SPA1600D, SPA90.2 Adjustments and Settings, Fine Tune the System

Models: SPA1300D SPA1900D SPA1000D SPA90.2 SPA1600D SPA90.4 SPA150.4