Retired model

The Tetrad is no longer in regular production, but it is the IEM that started it all, and Isaiah still hand-builds them on request. Ask about a set.

Tetrad
The original · 4-driver hybrid

Tetrad

$179.00 Retired · built on request

The inaugural Symphony Ears IEM, and the one that earned the brand its first following. A warm, engaging quad-driver hybrid built for the basshead in all of us: rich bass, velvety vocals, and crystalline percussion.

Original finishes
Midnight Pearl Crystal Blue
Ask about a Tetrad See current models
Made in USA
Hand-built
1-yr warranty
  • 10mm dynamic driver + three genuine Knowles balanced armatures
  • Warm, bass-forward signature with smooth, detailed mids
  • Premium copper cable, 3.5mm, 2-pin detachable
  • Hand-built and tuned by Isaiah, made in the USA
The sound

Warm, fun, and easy to love.

The Tetrad was built for enjoyment first. The single dynamic driver lays down rich, satisfying bass while three Knowles armatures keep vocals smooth and the top end clean and sparkly.

It is an unapologetically musical signature, and the reason the Tetrad still has fans years after its debut.

Measured frequency response of the Tetrad MK1
Real measured frequency response
Reviews

What Tetrad owners said

Real, unedited reviews of the IEM that started it all.

“Rarely do IEMs offer such clarity and detail and musical smoothness in the midrange that the Tetrad offer. Bass is fantastic and midrange is liquid, detailed and properly balanced to my tastes. They are incredibly enjoyable to listen to!”
Chris
Verified Tetrad owner
“Such a nice bass and smooth sound overall. Plenty of sparkle. Just all around a really enjoyable listen!”
Kurt
Verified Tetrad owner
“Mature tuning on the first effort by a young prodigy. Music feels live and spacious, with a lot of air between instruments.”
530620
On the Tetrad

Video reviews

Gearhead Creations — Tetrad review
Gearhead Creations
Tetrad review
In the box

What it came with.

  • Zippered carrying case
  • Premium copper cable, 3.5mm termination
  • 3 pairs of eartips in varying sizes
Specifications

The details.

Configuration
4-driver hybrid
Bass
10mm bio-fiber dynamic
Midrange
2× Knowles balanced armature
Treble
1× Knowles balanced armature
Shell
3D-printed resin
Finishes
Midnight Pearl, Crystal Blue
Connector
2-pin detachable
Cable
3.5mm copper
Status
Retired, built on request
Warranty
1-year parts & labor
Made in
USA, by Isaiah Schell

1-Year Warranty

Full parts & labor coverage. If anything goes wrong, you just cover shipping.

Built to Order

Each pair is hand-assembled for you and ships in about 2–4 weeks.

Personally Tuned

Every set is hand-tuned and quality-checked by Isaiah before it leaves the bench.

Talk to the Maker

No call center, no ticket queue. You email the person who built your IEMs.

Looking for a current model?

PRE5TIGE flagship IEMs

PRE5TIGE

5-driver flagship · signed

$679
Hexad IEMs

Hexad

6-driver tribrid · wood faceplates

$275
$179.00
Retired · on request
Ask about a Tetrad