
Justin Phelps has been mastering albums since 1997. His involvement in this mysterious art was ramped up in 2009 when he moved from San Fransisco to Portland. At that point he received some final training from legendary engineers John Cuniberti at The Plant Mastering in Sausalito CA and Rick McMillen at Super Digital in Portland OR. Since then he has mastered approximately 400 projects for regional, national and international artists.
Justin’s mastering credits include:
Emily Wells, Everyone Orchestra, Fruition, Rich Kids On LSD, Amanda Richards, March Fourth, All Classical FM, Jet Boy, Lynx, MDC, Dead Kennedys, DOA, Robin Jackson, Sassparilla, Lila Rose, Logan Lynn, Ryan Lewis, The Dandy Warhols, Tiffany, Double Plus Good, Moon Museum, Volume Bomb Records, Rise Records, Fat Wreck Chords, Cartesian Binary Records and Hallowed Halls Presents live concert documentary series among many others.
Explore some of Justin’s other credits here:
https://www.discogs.com/artist/360056-Justin-Phelps?type=Credits&filter_anv=0

Duggan Backhouse-Prentiss (they/them), also known by their producer/DJ name sea_wraith, first began studying audio mastering at the Hallowed Halls studio under chief engineer Justin Phelps in 2019 while finishing their degree in sonic arts at PSU. They are now actively working out of the studio and taking on clients.
Duggan is also a full time DJ and Twitch streamer, and loves working with electronic and hip hop artists. Follow: @sea_wraith
Duggan’s mastering credits include:
Giant Killer Bats – Giant Killer Bats EP (Terrible Records)
JHNN – StereoTYP (album, Dem Modest Kids)
Volume Bomb the Cops (compilation, Volume Bomb Records)
Liila – Soundness of Mind (album)
CD 3K – Sleeptown (album)
voix in the dark – New Body (single)
HorrorScene – Redwood Forest (album)
Marceline – D.O.O.M.
Full list of credits:
https://soundbetter.com/profiles/342375-sea_wraith-mastering
Burl & Lavry Conversion
Manley & SSL Compression
Great River, API, & UREI Equalization
Studer 820 2 Track
Genelec 8260A Monitoring




Single Track Mastering
Mastering for single songs and scores
0 - 7 Minutes in Length - $100
Album Track Mastering
Mastering for additional album songs and scores
0 - 7 Minutes in Length - $70
7 - 10 Minutes in Length - $100
10+ Minutes in Length - $120
Note: First track of an album is billed at Single Track rate, with additional tracks billed at Album Track rate
Additional Mastering Versions
Vinyl Premasters, Alternative Edit Versions, Instrumental Versions, and Alternative Volume Versions can be added to any project for half the price of the original version
Additional CDR Reference Copies can be created for $10 each