Bob Brozman - Official Website

The Reso-Acoustic 400 Sound System

Designed by Bob Brozman
Made in Italy by SR Technology

A one-piece Professional Sound System, like never before! So much more than a guitar amp...The RA-400 is a full-range, multi-channel professional sound system for all acoustic musicians! Email for more info.

Ideal for clubs, medium concert halls, workshops, rehearsal, at huge clean volume - with microphones and/or pickups. Tested extensively by Bob Brozman, onstage throughout Europe and North America under many different conditions.

Incredible 400 watts of clean power in a compact and well-built unit.

- Dedicated channels for resonator guitars, with EQ frequencies and bandwidth designed by Bob Brozman to maximize great tone while being able to cut feedback at the typical frequencies for these instruments.
- Choose between three channels, for different EQ design, depending on the room and the desired sound.

- Dedicated channels for all acoustic instruments, with EQ frequency and width designed by Bob Brozman specially for all wood guitars, mandolin, ukulele, percussion etc. Allows the musician to shape their tone and eliminate common feedback problems.
- Choose between three channels, for different EQ design, depending on the room, the instrument, and the desired sound.

- Dedicated channels for pickups, piezo and magnetic, with EQ designed to bring out the best pickup levels while minimizing the typical problem frequencies of pickups
- Choose between these channels and the others, for different EQ design, depending on the room, the instrument, and the desired sound.

Gives more flexibility to eliminate room feedback in different shaped rooms, helps eliminate any unwanted stage resonances.

Perfect for the soloist/vocalist with multiple instruments. Perfect for duos, trios and quartets.

Gives even more sonic flexibility and control of the bass frequencies.

Delays and reverbs by Alesis, adjustable at each channel.

Full phantom power to run all condensor microphones.

Weight: 21 kg / 46 lbs.

Width: 37 cm / 14 in.
Height: 46 cm / 18 in.
Depth: 43 cm / 17 in.

Reso Acoustic Sound System RA 400 - Front View.
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Reso Acoustic Sound System RA 400 - Mixer View.
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Reso Acoustic Sound System RA 400 - Rear View.
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Reso Acoustic Sound System RA 400. Click image for larger view.

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I designed this sound system with the great engineers at SR Technology, who make wonderful large PA systems, because working acoustic musicians need the same professional quality of sound that large sound systems provide.

The father of the "acoustic guitar amp" is the electric guitar amp, which was purposely designed to have a limited frequency range. The father of the Reso-Acoustic 400 Sound System is the SOUND SYSTEM, which is designed to have full-frequency range high-fidelity sound, accurate and clean. I was shocked by the power and clarity of this compact system the first time we powered it up, and I am very happy with the results.

The EQ frequency and bandwidth designs I have included in the Reso-Acoustic 400 come from years of touring experience, working in every possible situation. It is great to have a system where the good frequencies can be boosted while the typical feedback problems on the gig can be quickly solved with frequency-points built in. I can use it with confidence in many different situations, and so will you!

Bob Brozman, 2008

Email for more information about the Reso-Acoustic 400 Sound System.
Download Brochure (Adobe PDF)

If you have purchased an RA-400 Sound System and would like to request a digital User Manual (Adobe PDF), please Email us.