We are the Heavyweights

Since 1999
Bassology Gurus

It all starts with a vision

Analog Mojo

Shimmering EQ-uality

Digital Magic




About your music, and share your passion.


A professional sound, bringing your music to life. We take the time to understand what you’re trying to achieve with your music.


With decades of experience, we will help nurture and guide, to get the best from your creativity.


Here at the Heavyweight headquarters, we live, breath and eat audio. With a high attention to detail, we’ll ensure you, as the client, can reach your full potential, keeping your creative direction in mind.

We have multiple rooms setup for mixing and mastering, along with a mobile setup that we take out on the road as required.

World Class Mix-downs & Mastering Utilising The Best In Analog Mojo and Digital Magic

Whether it’s House, Techno, Trap or Disco, do you wonder why some tracks sound bigger than others? They fill a club’s sound system when other records fall flat.

We provide the link between your potential and a great sounding record, no matter what style rocks your boat! With over 15 years experience working with some of dance music’s best, Klaus Heavyweight Hill and the team can give your project the phattest sound for today’s sound systems. With acute attention to detail, decades of experience and unparalleled commitment, we provide the highest-quality audio mixing and mastering at sensible prices.




Track mixing is carried out in our engineers dedicated rooms, either ITB (in the box) or on a console with hi-end outboard. Following options available: FULL ANALOG MIXDOWN Service or ITB DAW Mixdown Service. Both services include mastering. Final mastered songs will be delivered as a 16bit WAV file. If you need other formats please ask. Contact us for more information!

Stem Mastering

Stem Mastering

Highly recommended service, stem mastering involves grouping individual audio tracks together to allow for independent control and signal processing. We require you to provide the following; 6 summed audio files, rendered from beginning to end of the track: Kick, Drums, Bass, Synths, Effects and Vocals. Final mastered songs will be delivered as a 16bit WAV file. If you need other formats please ask. Contact us for more information!

Stereo Mastering

Stereo Mastering

This is the traditional practice from mastering engineers, and is carried out by us with a selection of fine analog processing in our dedicated room. Using a stereo file sent by the artist and putting it through this final process, we are able to enhance the sound quality and deliver a product that will have impact on sound systems. Final mastered songs will be delivered as a 16bit WAV file. If you need other formats please ask. Contact us for more information!



Please contact us for pricing on any services that you are interested in.  We offer extraordinary value due to our efficient workflow of unattended sessions and low overheads, so feel free to proceed with confidence, our reputation precedes us. Contact us if you have a question or require more information.

"Perfection is achieved, not when there is nothing more to add, but when there is nothing left to take away."


The Team

Klaus Heavyweight Hill

Klaus Heavyweight Hill

Mixing & Mastering Engineer - Bassologist - CEO

The year is 1992 and London’s pirate radio airwaves and clubs are awash with a new sound, what people will later call Jungle. It was in this environment that a younger Klaus decided that electronic dance music would be his life. As a producer he’s released music on some of the world’s biggest and coolest labels. As a DJ he’s toured the world, was resident at legendary club The End for Ram Records and played some of the biggest and best festivals. As a mix and mastering engineer, he has made his name working with labels and clients such as Ministry Of Sound, Spinnin’ Records, Shogun Audio, Pnau, Heldeep, SCNDL, Peking Duk, Jacks Beats, Chris Lorenzo, DJ Zinc, Will Sparks, Felix Da Housecat, One Love, Sony, Soul:r, Yolanda Be Cool, Sweat It Out!, Kilter, PACES and Ryan Riback.

Chris Allen

Chris Allen

Mixing Engineer & Producer

A 20 year professional career spanning numerous genres and encompassing many long-term collaborations with noted artists has been the precursor to Chris Allen becoming a key figure in some of the most innovative electronic music created today. Currently mix engineering for some of the finest names in electronic music, his philosophy is to do whatever it takes to craft a record into a unique listening experience. based in Brighton, UK at Toyroom Studios he mixes on a Protools HDX system equipped with a carefully chosen selection of analogue hardware and vintage tape machines. client roster includes Ry-X, Ame, Tale of Us, The Acid, Howling, UNKLE, Way Out West, Mano le Tough, Frank Wiedemann, VESSELS, Sailor & I, Mykki Blanco, James Lavelle, Infectious/BMG, Sony, Life & Death, Innervisions & Monkeytown.

Sameer Sengupta

Sameer Sengupta

Mixing Engineer & Producer

At age 7, his love of drums & computers preordained a career in dance music. By the age of 21 he was signed and playing every club and festival throughout Australia and beyond, most often playing support slots to the likes of Depeche Mode, The Prodigy, Chemical Brothers, CJ Bolland, Crystal Method and Paul Oakenfold. Later, signed to Thunk and Ministry of Sound, Sameer solidified his production skills producing dancefloor fire for Ferry Corsten, Green Velvet, Benny Benassi, Mylo, Freestylers, Sneaky Sound System, The Aston Shuffle, The Potbeleez, Uberjak’d, tyDi, Kilter, Baz Lurhman, Luke Solomon and more leading to an ARIA Nomination. He joined Sydney’s Studio 301 as in-house mixer and mastering engineer before relocating to Los Angeles where he currently resides. Most recently he has worked on records for Sting & Shaggy, Tori Amos, Smashing Pumpkins, PRETTYMUCH, ODESZA, Mansionair, Louis The Child, Sabrina Carpenter, Backstreet Boys, Matoma, Alison Wonderland, London Grammar and Chris Baio (Vampire Weekend).

Client Testimonials

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Come and Work with Us