Powerful amplifiers tend to be large and heavy. Not so with the new JBL by Harman multi-element, high-performance Marine Class D amplifiers from Prospec Electronics. They deliver massive, dynamic sound from slim, compact chassis that install into the tightest of spaces.

Engineered from the ground up to perform in a harsh marine environment, JBL by Harman Marine amplifiers have weather-resistant enclosures. Even the circuit boards are marinized to protect against moisture.

Two versions of JBL by Harman Marine Amplifiers are available. The four-channel 4x70W RMS @ 4 ohms MA704 boasts 1,000W peak power. The chassis is 14.125" L x 7.313" W x 3.25" H and weighs 9.5 lbs.

The five-channel MA4505 has 4x45W RMS @ 4 ohms (full range), and a dedicated subwoofer channel rated at 500W x 1 @ 2 ohms. It weighs 10 lbs. and measures 15.75" L x 7.5" W x 2.375" H.

Both JBL by Harman Marine Amplifiers have selectable outputs. They incorporate the latest in amplifier topology to include selectable all-, high-, or low-pass crossovers with variable electronic frequency adjustment for precision system tuning. Speaker-level and low-level inputs allow it to integrate with just about any audio input.

The MA704 JBL by Harman Marine Amplifier from Prospec Electronics costs $249.95, the MA4505, $349.95.

Contact Prospec Electronics, 3325 S Morgans Point Rd., Mt. Pleasant, SC  29466. www.prospecelectronics.com; www.facebook.com/ProspecAudio; www.instagram.com/prospecelectronics.