END-1 · Limited Edition

4 Impulse Responses.
1 Transducer.

END Audio's limited-edition coaxial IEM pairs an 11mm woofer + 8mm tweeter transducer with four channel-balanced impulse responses providing distinct sonic flavours to enjoy.

About Us

Signal over noise.

Born from a passion to deliver transformative listening experiences, END Audio was founded with a simple goal: to share the joy of truly exceptional sound with everyone.

Each unit is carefully calibrated and tuned by hand, before it ships.

What makes us special

At the core is a 11mm woofer + 8mm tweeter within a coaxial driver transducer - treble extension among the best, with natural tonality, note weight, and detail that holds up under scrutiny.

Every unit is exclusively yours: measured on an IEC 711 coupler, channel-balanced, and hand-tuned before it ships. We operate with a small batch, artisan approach.

Tri Clarion eartips are part of the acoustic system above 10 kHz, extending what stock tips cannot reproduce.

We shape that balanced hardware with precise convolution and impulse-response modelling ; one transducer, four house sounds. See Impulse Responses for the target response curves, and How To for setup.

Impulse Responses

Choose your house sound

Four impulse responses, all using the same balancing. Load via convolution or Qudelix import. Demo units pictured below: END-1 (U1 & U2).

Loading measurements…

Measured on IEC 711 · normalized at 1 kHz

Click on a card below to see the frequency response for each tuning.

END-1

11mm woofer + 8mm tweeter coaxial driver.

Impulse Responses

Per-unit calibrated IRs from measured EQ targets.

Setup paths

Windows, Linux, Android, and Qudelix 5K guides below.

END Audio impulse responses are delivered as .wav impulse responses. Load them through convolution on Windows, Linux, or Android, or import L/R balance and EQ presets on a Qudelix 5K you purchase separately.

In the box: every unit includes a QR code to download a zip with impulse responses and Qudelix import files (L/R balance + EQ presets).

Prerequisites

Equalizer APO installed (Device Selector + Configuration Editor)
Target output device selected in Device Selector - the DAC/headphone output you actually use
IR sample rate must match the Windows playback device sample rate (48000 Hz)
Supported IR formats: .wav, .flac, .ogg
Disable other EQ/effects in the chain; add Preamp if clipping occurs after convolution

Steps

Open Equalizer APO Device Selector and confirm Equalizer APO is installed on the DAC you are using.
Open Equalizer APO Configuration Editor. Disable everything else, then add Convolution (Impulse response).
In Convolution, select the .wav for the impulse response you want.
Apply shared gain/volume settings from the Listening recommendations table below.

Equalizer APO project Configuration reference (Convolution)

Listening recommendations

Apply these gain and volume settings regardless of platform.

Impulse Response	Gain	Volume
Harman (V shaped)	High	Medium
All other impulse responses	Low	High

Source hardware

For wired listening on Windows, Linux, or Android, we recommend the CrinEar Protocol Max as your USB DAC of choice. Plug the IEM into its 3.5 mm output and run convolution in the platform guides above.

For wireless listening, or when you want to import the bundled L/R balance and EQ presets without host-side convolution, we recommend the Qudelix 5K as a Bluetooth receiver and portable DAC/amp. See the iOS/Android (Qudelix) tab above for import steps.

Both devices are purchased separately; END Audio supplies impulse responses and L/R balance/EQ presets only.

Fit

Use the included Tri Clarion eartips and insert the IEM's deep in the ear - deep insertion depth is intentionally part of the calibrated acoustic system, as described in our About Us section. Shallow insertion will change the frequency response relative to the calibrated impulse responses.

Specifications

Measured, balanced, and crafted. What you hear after calibration is defined by the measured response we ship, not driver spec alone. See IEM EQ Guide: Myths & Misconceptions.

Model: END-1
Base hardware: Samsung EO-IA500 (3.5mm)
Drivers: Coaxial driver - 11mm woofer + 8mm tweeter
Impedance: 32 Ω
Sensitivity: 93.2 dB
Frequency response: 20 Hz - 20 kHz
Cable: 3.5mm, 1.2 m; inline 3-button remote + mic
Eartips: Tri Clarion
IR delivery: Zip download (QR in box): .wav impulse responses + Qudelix L/R balance and EQ presets
Impulse Responses: Diffuse Field, Harman, QDC, JM-1

Contact

Questions?

END-1 pre-order inquiries and setup help, reach out directly.

4 Impulse Responses.
1 Transducer.

About Us

Choose your house sound

DF

Harman

QDC

JM-1

END-1

Impulse Responses

Setup paths

How To Apply Your IR

Prerequisites

Steps

Listening recommendations

Source hardware

Fit

Specifications

Questions?

4 Impulse Responses.1 Transducer.

About Us

Choose your house sound

DF

Harman

QDC

JM-1

END-1

Impulse Responses

Setup paths

How To Apply Your IR

Prerequisites

Steps

Listening recommendations

Source hardware

Fit

Specifications

Questions?

4 Impulse Responses.
1 Transducer.