Clear. Sound.




Our mission is to help extend the reach of the human voice while preserving its beauty.

For the past five years, we have been working hard to provide the highest quality services to a cappella groups of all backgrounds. Whether it's professional, college, or high school a cappella, we are fully committed to creating the best possible final product for your group. We specialize in live sound, but our services don't stop there. We have a team of very talented audio engineers who are waiting to help you produce your next album. Additionally, we offer a wide range of workshops for groups of all sizes and skill levels. We are looking forward to the opportunity to work with your group.

Caleb Whelden is, hands down, in every way, the best sound engineer I have ever worked with... Ask any student who sings in an a cappella group in Massachusetts who their favorite person in a cappella is — that student will say Caleb.
— Dave Grossman, Choral Director, Plymouth North High School

As contemporary a cappella music has grown, so has the need for qualified engineers who have a full understanding of the art form. For too many years, I sat through concerts where sound engineers struggled to amplify a cappella groups without stepping on the beauty of the art form. I took it upon myself to provide an alternative to what was already out there. With 15 years of experience as a performer in the a cappella community, I have developed a unique understanding of groups' needs. My primary focus is to make sure that months (and sometimes years) of hard work is not lost when the lights come up. I take pride in my work and I will always do everything I can to make sure your next concert is a success.

- Caleb Whelden, Owner




Live Sound

The "bread and butter" of our company is live sound production. Whether it's the need for a full PA, or individual microphones, we have all of the gear to run sound at your next show. Our quality is second to none, and we do our best to work within your budget to make sure you can afford our services. Looking for the clearest in a cappella sound? You've come to the right place.


We offer a wide range workshops and master classes for groups.  All of our clinicians are professionals in the a cappella community and have a vast knowledge of the art form.  Whether it's specific rehearsal techniques or preparing for a performance/competition, we will help you get the most out of your group.  

We pride ourselves on being one of the few production companies that offers workshops for live sound production.  If you'd like to learn more about the ins and outs of a cappella live sound, contact us for classes!


We are incredibly lucky to have on staff two well-known professional a cappella groups:

Five O'Clock Shadow, throughout its 27 year history, has redefined the possibilities of vocal music by incorporating real-time digital effect processing and innovative writing and arranging into its critically acclaimed live performances and recordings.

Overboard's energetic live show has caught the attention of the global a cappella community as well as Boston's discerning local music scene.



Caleb’s ears and attention to detail are second-to-none. Combine that with his infectious energy and lightning-fast speed and you can’t find a more consummate professional.
— Nick Girard, The House Jacks

Caleb paid attention to the small details, making sure we were completely comfortable and satisfied with the sound...We would definitely trust him at the soundboard with any of our shows!
— Alfredo Austin, The Exchange

Caleb has all the tools of a reliable and appealing sound engineer. Professionalism, preparedness, and quality are the words that come to mind when I think of Caleb’s work... He [Caleb] mentors students involved and creates relationships with his clients that highlight his work and support the longevity of his craft for himself and others.
— Alex Grover, Choral Director, Danvers High School and Varsity Vocals ICCA Adjudicator

Caleb’s abilities as a sound engineer and designer are vast. Not only is he highly skilled in the technical aspects of the job, but also, he is an outstanding musician and trained educator... He knows exactly what to listen for, and how to manipulate the technology in the best way in order to achieve the ideal sound.
— Ana Morel, Choral Director, Wakefield High School

Working with Caleb was one of the most stress-free experiences we have had. Having a professional a cappella performer work the sound board was fantastic. He knew exactly what we were looking for... It was a fantastic show!
— Dave Guisti, Ball in the House

I can say with certainty that Caleb Whelden is, without a doubt, the most important person in the Boston a cappella community — and he holds this title while also being the most humble, normal, level headed person in the a cappella community as a whole.
— Dave Grossman, Choral Director, Plymouth North High School

The List

We'd love to include you on our list!  Please contact us to book us for your next show.



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