The TempoTec V1 firmware V1.2 officially introduces the PEQ (Parametric Equalizer). Featuring four core parameters—PREAMP, FREQUENCY, Q, and GAIN—it allows for precise control over the audio spectrum.

In short: Preamp prevents distortion, Frequency targets the spot, Q defines the width, and Gain adjusts the level. 

I. Deep Dive into the Four Parameters

1. Pre AMP (Pre-Gain / Global Gain)

• Role: Global volume control. It scales the entire signal before any EQ filters are applied.
• Unit: Decibels (dB)
• Core Functions:
• Prevent Clipping (Distortion): When boosting multiple bands (Positive Gain), the total signal may exceed the hardware limit, causing "cracking" sounds. Setting a negative Preamp (e.g., -3dB to -6dB) creates headroom to avoid this.
• Volume Compensation: If you have heavily cut multiple frequencies, the volume will drop; use Preamp to slightly boost it back.
• Golden Rule: If any frequency band is boosted (Gain+), the Preamp must be set to a negative value.

2. Frequency (Center Frequency)

• Role: The Target. Selects the exact point you want to modify.
• Unit: Hertz (Hz) / Kilohertz (kHz), range 20Hz – 20kHz.
• Frequency Zones & Perception:
• Sub-Bass/Bass (20Hz - 250Hz): Power, kick drums, bass guitar, thickness. Too much causes "boomy" sound; too little feels thin.
• Low-Mids (250Hz - 500Hz): Warmth and vocal fundamentals. Excess creates muddiness or a "boxy" sound.
• Mids (500Hz - 2kHz): Vocal clarity and instrument "bite." The core of the sound.
• Upper-Mids (2kHz - 5kHz): Presence, detail, sibilance, and attack.
• Highs (5kHz - 20kHz): Air, brightness, harmonics, and detail extension.

3. Q (Quality Factor / Bandwidth)

• Role: Range Control. Determines how wide or narrow the area around the center frequency is affected.
• Behavior: Higher Q = Narrower bandwidth; Lower Q = Wider bandwidth.
• Low Q (0.7 - 1.4): Broad impact, smooth and natural transitions.
• Mid Q (1.4 - 3.0): Balanced precision and naturalness.
• High Q (3.0 - 10.0+): "Surgical" precision for targeting narrow spikes.
• Analogy: Low Q is a wide paint roller; High Q is a fine-tip pen.

4. Gain

• Role: Volume adjustment for the selected range.
• Unit: Decibels (dB), typical range -9dB to +9dB.
• Principle: "Cut is better than Boost." Reducing frequencies usually sounds more natural and introduces less distortion than increasing them.

II. Step-by-Step Setup Guide

Step 1: Safety First — Set the Pre AMP

1. Always adjust the Pre AMP first when enabling PEQ.
2. Safe Default: Set Pre AMP to -3dB or -6dB if you plan to boost any frequency.
3. Exception: If you are only cutting frequencies (all Gains are negative), you can leave Pre AMP at 0dB.

Step 2: Precise Targeting — Finding the Frequency(The Sweep Method)

1. Create a new PEQ Band.
2. Set Gain to +6 ~ +9dB (exaggerated boost) and Q to 3.0 (narrow).
3. While playing music, slowly slide the Frequency left and right.
4. Listen carefully:
• When the sound becomes particularly harsh, boomy, or annoying, you’ve found a problem frequency to cut.
• When the sound becomes clearer or fuller, you’ve found an enhancement frequency.

Step 3: Define Range — Adjusting the Q Value

Step 4: Finalize Magnitude — Setting Gain

1. Fixing Problems (Cut): Once a problem frequency is found, set Gain to -2dB to -6dB. Start small and increase until the annoyance disappears.
2. Enhancing Strengths (Boost): For "sweet spots," set Gain to +1dB to +3dB. Keep boosts under +3dB to maintain a natural sound.

III. Filter Modes: LowShelf, Peaking, HighShelf

IV. Quick Start Examples

• Vocal Optimization:
• Muddy vocals: Peaking, 300Hz, Q=1.0, Gain=-3dB.
• Thin vocals: Peaking, 150Hz, Q=0.8, Gain=+2dB.
• Harsh sibilance (S-sounds): Peaking, 7kHz, Q=2.5, Gain=-4dB.
• Pop Music Enhancement:
• Punchy Bass: LowShelf, 80Hz, Gain=+2.5dB.
• Crisp Air: HighShelf, 10kHz, Gain=+2dB.
• Headphone Fixes:
• Boomy/Bassy: LowShelf, 120Hz, Gain=-3dB.
• Narrow Soundstage: HighShelf, 10kHz+, Gain=+2dB.

V. The Three "Never" Rules

1. ❌ NEVER leave Pre AMP at 0dB while boosting multiple Gains (Distortion guaranteed).
2. ❌ NEVER set Gain beyond ±6dB unless doing extreme repair (Sounds unnatural).
3. ❌ NEVER use high Q (>5) for boosting (Causes "ringing" or metallic artifacts).