DB Systems specializes in precision audio equipment, offering a range of preamplifiers, amplifiers, crossovers, tone controls, phase inverters, and power supplies. Their products include the DB-lB/2A Precision Preamplifier, DB-6A Precision Power Amplifier, DB-3 Crossover with various slopes, and DB-5 Precision Tone Control. DB Systems also provides upgrades and customization options for their products, such as premium connectors, balanced inputs/outputs, and gold-plated jacks. The company focuses on delivering high-quality audio equipment with features like low noise transistors, regulated power supplies, and improved performance enhancements for their existing products.