Troubleshooting

Adjustment of Built-In Crossover (All Models)

Placing the switch in the OFF position sets the amplifier to Full Range. This setting allows ALL frequencies to pass to the speakers. (Not available on HA 750.1). Placing the switch in the ON position activates the crossover.

Placing the switch in the HP position sets the amplifier to the High Pass mode, enabling frequencies above the cutoff point to pass.

Placing the switch in the LP position sets the amplifier to the Low Pass mode, enabling frequencies below the cutoff point to pass.

Turn the crossover adjustment knob all the way down. With the system playing, turn the crossover adjustment knob up slowly until the desired crossover point is achieved.

Adjustment of the Bass EQ (HA 750.1)

After setting the input gain adjustment and crossover, you may choose to add a small amount of “boost” in the low frequency region. This bass boost adjustment is FIXED at 45HZ. Remember that the Bass Boost feature will not fix a poorly designed subwoofer enclosure or subwoofers that didn’t sound good to begin with.

1)Make sure any bass EQ or low frequency equalization from the source unit is set to OFF or FLAT. If you have other outboard signal processors with equalization, you should use those to add boost first and leave the amplifier’s bass boost alone.

2)While playing the same musical selections used during the gain setting process, slowly increase the level of the Bass EQ. You should be able to notice a demonstrable change between 0 and +12dB. If you do not notice much difference, then it will not serve any benefit to increase the boost further.

3)If the boost has audible benefits without adding appreciable distortion, find a level that suits your taste. Remember: it’s much easier to construct the right subwoofer enclosure for your listening preferences than relying on a bass boost control to do the job!

Remember that the Bass EQ feature has an optional dash mounted control included with the amplifier that will function as an attenuator between the maximum level set at the amplifier and 0dB of attenuation. It will not add boost beyond the level you choose at the amplifier.

It’s imperative that you read the manual fully to eliminate the possibility of mistakes made from assumptions about how you “think” the amplifier might work versus how it’s recommended to be installed. If the amplifier does not appear to be working, check obvious things first such as blown fuses, incorrect wiring configurations, poor or loose connections, crossover, Bass EQ, and gain controls set incorrectly, etc. These elements are the most common cause of initial problems, so take your time and double check all of your work before assuming there’s a serious problem.

HA 750.1, HA 700.2, HA 700.4 specifications

Diamond Audio Technology has established itself as a key player in the high-performance audio industry, particularly known for its innovative amplifiers. The Diamond Audio HA series, encompassing the HA 700.4, HA 750.1, and HA 700.2 models, is designed for audiophiles who demand top-notch sound quality and reliability.

The HA 700.4 is a robust four-channel amplifier that delivers an impressive 100 watts RMS per channel at 4 ohms, while producing an astonishing 200 watts RMS per channel at 2 ohms. This amplifier employs advanced Class A/B circuitry, ensuring that audio reproduction is both powerful and crystal clear. It is equipped with high-level inputs, making it versatile enough to integrate with factory-installed audio systems. The HA 700.4 features a variable crossover, which allows users to tailor the output to suit specific audio preferences and achieve a balanced soundscape.

Next in the series, we have the HA 750.1, a mono amplifier capable of producing up to 750 watts RMS at 1 ohm. This model is designed for enthusiasts seeking strong bass performance. Its powerful output is complemented by a low-pass filter, enabling users to optimize their subwoofer performance. The HA 750.1 utilizes a high-performance MOSFET power supply, which ensures efficient power delivery and minimizes distortion, resulting in deep, rich bass tones.

Completing the lineup is the HA 700.2, a versatile two-channel amplifier that delivers 110 watts RMS per channel at 4 ohms and 220 watts RMS at 2 ohms. Ideal for driving component speakers or smaller subwoofers, the HA 700.2 features similar Class A/B technology as its counterparts. Its compact design is perfect for installation in tighter spaces while maintaining thermal efficiency through built-in heat sinks.

All three amplifiers are designed with durability in mind, featuring heavy-duty aluminum chassis that resist corrosion and provide excellent heat dissipation. The inclusion of adjustable gain control and built-in protection circuits further ensures reliability and longevity under various operating conditions.

In summary, the Diamond Audio Technology HA 700.4, HA 750.1, and HA 700.2 amplifiers boast state-of-the-art technologies, robust outputs, and user-friendly features that cater to serious music lovers. Whether enhancing high-frequency details or delivering deep bass, these amplifiers provide an unparalleled audio experience, making them a worthy addition to any sound system.