D-70MKII

AMP MANUAL, Acoustic Research Corporation

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D-70MKII ACOUSTIC RESEARCH CORPORATION Arc Amp Manual

The ARC D-70MkII from Acoustic Research is a high-fidelity bookshelf loudspeaker that delivers exceptional sound quality, making it an ideal choice for music enthusiasts and audiophiles. This updated version of the classic D-70 model incorporates several advanced features, resulting in enhanced performance and improved sonic accuracy.

Measuring 12 inches tall, 7 inches wide, and 11 inches deep, the D-70MkII boasts a sleek and elegant design. Its cabinet is constructed from MDF, a dense and rigid material that helps minimize resonance and unwanted vibrations. The loudspeaker's finish is available in a variety of colors, including walnut, cherry, and black ash, ensuring it blends seamlessly with any d cor.

The D-70MkII's drivers are custom-designed and engineered for optimal sound reproduction. The speaker features a 1-inch dome tweeter made of aluminum, which offers excellent dispersion and a wide frequency response. The woofer is a 6.5-inch ceramic cone driver, which delivers powerful and clear midrange and bass frequencies. The crossover network is meticulously designed, providing a smooth transition between the woofer and tweeter, ensuring that the audio signal is evenly distributed and that both drivers work in harmony.

The D-70MkII is a passive loudspeaker, meaning it requires an external amplifier or receiver to function. It has a nominal impedance of 8 ohms and a sensitivity of 85 decibels, making it compatible with a wide range of amplifiers. The loudspeaker's impedance is relatively low, allowing it to be driven by smaller amplifiers while still maintaining optimal performance.

The included D-79C amplifier is a powerful and versatile option for driving the D-70MkII. This Class AB amplifier delivers 30 watts per channel into 8 ohms and features a frequency response of 20 Hz to 20 kHz, ensuring that it can handle the demanding requirements of the D-70MkII. The amplifier's control panel includes volume, balance, bass, and treble knobs, allowing for fine-tuning of the sound and customization to personal preferences.

The D-70MkII comes with a comprehensive user manual, including the D-79C amplifier manual from 1982. The manual provides detailed instructions on setting up and using the loudspeaker and amplifier, as well as troubleshooting common issues. It also includes information on the technical specifications and features of both the D-70MkII and D-79C, ensuring that users have a thorough understanding of their components and can enjoy the best possible listening experience.

The ARC D-70MkII and D-79C are vintage audio components manufactured by Acoustic Research in the early 1980s. Both the D-70MkII speaker and D-79C amplifier have their unique advantages and disadvantages, which are essential to consider before making a purchase.

The ARC D-70MkII is a bookshelf speaker known for its clear, detailed sound and wide dispersion. Its advantages include:

1. Vintage design: The D-70MkII's wooden cabinets and classic design add a touch of elegance to any room.

2. Wide dispersion: This speaker's wide dispersion pattern allows for better sound coverage in a room, making it suitable for smaller spaces.

3. Detailed sound: The D-70MkII delivers a clear and detailed sound, making it an excellent choice for listening to music or watching movies.

However, the D-70MkII also has some disadvantages:

1. Limited bass response: Due to its small size, the D-70MkII may not provide the deep bass response that some listeners prefer.

2. Sensitivity: With a sensitivity of 86dB, the D-70MkII may require a more powerful amplifier to deliver optimal sound levels.

The ARC D-79C is a compact stereo amplifier that can deliver up to 25 watts per channel. Its advantages include:

1. Compact size: The D-79C's small size makes it an excellent choice for those with limited space.

2. Wide frequency response: This amplifier can handle a wide range of frequencies, making it suitable for driving various types of speakers.

3. Vintage design: The D-79C's wooden cabinet and classic design add to its aesthetic appeal.

However, the D-79C also has some disadvantages:

1. Power output: With only 25 watts per channel, the D-79C may not be powerful enough to drive more demanding speakers.

2. Limited features: The D-79C is a simple amplifier with few features, which may not be suitable for more advanced users.

In conclusion, the ARC D-70MkII and D-79C are vintage audio components with their unique advantages and disadvantages. The D-70MkII offers clear, detailed sound and wide dispersion but may not provide the deep bass response that some listeners prefer. The D-79C is a compact and powerful amplifier with a wide frequency response but may not be suitable for driving more demanding speakers.

If you are looking for a vintage bookshelf speaker with clear sound and wide dispersion, the ARC D-70MkII may be the right choice for you. However, if you need an amplifier to drive it, consider an amplifier with more power than the D-79C.

On the other hand, if you are looking for a compact and powerful amplifier with a wide frequency response, the ARC D-79C may be the right choice for you. However, if you have more demanding speakers, consider an amplifier with more power than the D-79C.

In summary, the decision to buy the ARC D-70MkII speaker and D-79C amplifier depends on your specific audio needs and preferences. If the D-70MkII's sound profile and the D-79C's power output meet your requirements, then these vintage components may be an excellent addition to your audio system.

Details:

An original audio Research corporation manual for the model 79c power amp. Circuit 1982.

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