PEQ Settings Instructions for FiiO Portable DAC/AMP

1. FiiO Products with PEQ Support

FiiO products supporting PEQ settings are categorized by their control method:

Wired PEQ Settings:

KA17, KA15, JA11, BTR13, BTR17, BTR15, K19, K17, Q7, Q15

Web Control PEQ Settings:

KA17, KA15, JA11, BTR13, BTR17, K15
Web control link: https://fiiocontrol.fiio.com/

DSP Client PEQ Settings:

K19, K17

Bluetooth PEQ Settings:

UTWS5 2025, Q7, Q15, BTR13, BTR15, BTR17, FW5, FW3, UTWS5, K9, K9AKM, K9Pro, K9Pro ESS, K17, K19, K15, K7BT, BTR7

FiiO products supporting PEQ, whether via Bluetooth or wired connection, can be adjusted using the FiiO Control app. The web-based interface currently supports some newer models, with more to be added. UI interfaces may vary slightly between different versions and products; refer to the actual display after connecting your device.

2. PEQ Setting via Mobile App: FiiO Control APP

This section uses the KA15 as an example.

After downloading the FiiO Control app, connect your KA15 to an Android device via an OTG cable to adjust PEQ settings. (Note: K15/K17 connect via Wi-Fi and do not require a data cable.)
Navigate to the Equalizer to configure EQ settings.

The KA15 offers seven built-in EQ presets (Jazz, Pop, Rock, Dance, R&B, Classical, Hip-Hop) that cannot be modified. Below these are three customizable EQ slots (USER1, USER2, USER3), which can be renamed by long-pressing the name.

Adjustable Parameters:

Gain: Adjusts global gain (-12 dB to +12 dB).
Frequency: Sets the frequency point (20-20,000 Hz).

Switching to USER1 and clicking 'Advanced Settings' allows adjustment of Gain, Q value, and selection from seven filter types. The Q Value is adjustable from 0 to 100.

The KA15 supports cloud sharing, downloading, and uploading of PEQ presets (requires FiiO account login).

Saving PEQ Presets:

Local: View and manage saved or downloaded PEQ presets.
Selected: Download PEQ presets shared by other FiiO users.
Save:
- Save to Local data: Stores current settings as a local EQ preset for future access.
- Overwrite Local EQ: Replaces an existing local EQ preset with current settings.

3. PEQ Setting via Web Control

Connect your KA15 to your computer via USB (preferably using the rear motherboard port). Click 'Connect', select KA15, and click 'Connect' for EQ adjustment.

The EQ adjustment options are similar to the mobile app, offering a convenient way to configure PEQ on a computer. The web version offers seven preset EQ curves (Rock, Pop, Classical, Blues, Jazz, Hip-Hop, Dance), but adjustments cannot be saved. Custom EQs allow saving three presets, with changes taking effect immediately without needing to click 'Save'.

4. PEQ Introduction

PEQ, or Parametric Equalizer, allows for detailed adjustments of various parameters including frequency bands (low, mid-low, mid-high, high), frequency points (sweepable), gain (boost or cut), and quality factor Q (bandwidth). It is used for subjective sound adjustments to make musical styles more distinct and vibrant.

Users can adjust PEQ parameters like frequency, gain, and Q value through the FiiO Control app for accurate frequency responses. The document will also introduce various filter options for audio effects.

Main PEQ Parameters:

(1) Frequency: The specific frequency point being adjusted, determining the operating frequency range. For example, setting frequency to 1kHz primarily adjusts audio frequencies around 1kHz. Adjusting frequency points can selectively boost or cut frequencies to alter audio timbre.
(2) Gain (G): The degree of volume adjustment for the selected frequency point. Positive gain increases volume (e.g., +6dB amplifies), enhancing specific frequency components. Negative gain reduces volume (e.g., -3dB attenuates), reducing unwanted components like noise or resonance.
(3) Q Value: Reflects the width of the frequency range adjusted. A low Q value (e.g., 0.5) affects a broader range, suitable for overall tonal adjustments. A high Q value (e.g., 10 or higher) targets a very narrow range, ideal for eliminating specific noise or resonance.

Additional Notes & Tips:

PEQ Adjustment Tips: Prioritize attenuation over boosting. It's often better to cut mid-frequencies than boost low/high frequencies. Adjust gain to a perceivable level (a 2dB change is noticeable). Compare sound by toggling the equalizer on and off during adjustments.
Audio Metric Changes: Tests show that PEQ adjustment results in slight distortion changes, generally imperceptible during normal listening. The primary effect is the altered listening experience due to amplitude adjustments.

Functions of Different Filter Types:

4.3.1 Low Shelf: Adjusts the low-frequency range. Boosting increases volume below a cutoff frequency, enhancing bass. Cutting reduces low-frequency volume, eliminating rumble or muddiness. Applications include enhancing bass impact in electronic music or improving sound quality by cutting low-frequency noise.
4.3.2 High Shelf: Adjusts the high-frequency range. Boosting increases volume above a cutoff frequency, enhancing brightness and clarity. Cutting reduces high-frequency volume, softening harsh highs. Applications include making string instruments sound brighter in classical music or improving listening comfort by cutting piercing highs.
4.3.3 LowPass Filter: Allows signals below a set frequency to pass while attenuating higher frequencies. Creates a softer, warmer sound. Applications include reducing sibilance for vocals or creating a tranquil atmosphere in ambient music.
4.3.4 BandPass Filter: Allows only signals within a specific frequency range to pass, attenuating others. Emphasizes particular frequency bands or isolates audio elements. Applications include making instruments stand out during mixing or extracting specific frequency characteristics for audio analysis.
4.3.5 AllPass Filter: Allows all frequencies to pass without attenuation. Primarily adjusts phase characteristics, affecting spatial and stereo perception. Applications include optimizing phase relationships for better soundstage in audio system calibration or creating effects like echo in special audio processing.

	FiiO KA17 DAC and Headphone Amplifier User Guide User guide for the FiiO KA17 DAC and Headphone Amplifier, covering setup, features, operation, and troubleshooting.
	FiiO K9 Pro Quick Start Guide - Desktop DAC and Amplifier Concise guide to setting up and operating the FiiO K9 Pro Desktop DAC and Amplifier, covering ports, controls, connections, and safety precautions.
	Fiio JadeAudio KA17 User Manual User manual for the Fiio JadeAudio KA17, providing instructions on its features, operation, and specifications.
	FiiO Q15 DAC and Headphone Amplifier User Guide User guide for the FiiO Q15 DAC and Headphone Amplifier, detailing its buttons, ports, charging, modes, and precautions. Includes technical specifications and environmental compliance information.
	FiiO K17 User Manual: DAC and Headphone Amplifier Guide Comprehensive user manual for the FiiO K17, a flagship-level DAC and headphone amplifier. Learn about its features, operation, connectivity, PEQ functions, streaming capabilities, and firmware upgrades.
	FIIO K15 Decoding Headphone Amplifier User Manual A comprehensive guide to the FIIO K15 decoding headphone amplifier, detailing its features, operation, connectivity options, audio modes, app control, PEQ settings, protection mechanisms, and firmware updates.
	FiiO K9 Pro Quick Start Guide A quick start guide for the FiiO K9 Pro Desktop DAC and Amplifier, covering button and port identification, operation, and important notes.
	FiiO FX15 Electrostatic 1DD 1BA Hybrid In-Ear Monitors User Manual User guide for the FiiO FX15 Electrostatic 1DD 1BA Hybrid In-Ear Monitors, covering wearing instructions, MMCXAssist tool usage, cable connection/disconnection, precautions, authenticity checking, warranty terms, and after-sales service.