Ground Zero | Barcode: 4037072026627

GZA 125.4-30A Limited Edition

599,00€

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Amplifier

Packaging Unit

Product variants

Free shipping from 49€

Shipping

✓ Free shipping from 49€ within Germany and from 99€ to the EU.

✓ Delivery times vary depending on the product and can be found on the product page, usually 1 - 3 working days for stock items, international shipping times vary, usually 6 - 10 working days.

✓ In most cases, shipping is carried out by DHL, UPS and GLS.

✓ Depending on the product and location, items can also be shipped with other providers.

✓ Tracking will be sent by email after the shipment has been processed.

Normal shipping route

✓ 1 - 40Kg = DHL, UPS and GLS

✓ 40.1 - maximum kg = forwarding agency

✓ Bulky goods = freight forwarder

✓ Customs shipments = DHL, GLS or freight forwarder

Parcel collection

✓ Collection takes place regularly from Monday to Friday, orders received by 3 p.m. are usually disposed of on the same day for goods in stock and transported directly to the parcel center.

5% discount for prepayment

Receive a 5% pre-payment discount. The discount is automatically deducted in the shopping cart/checkout and is valid for all products. Vouchers or discount codes may be excluded or already combined.

Wiring wizard & port computer

Use our wiring wizard for simple wiring of speakers and subwoofers! The correct connection is important for your amplifier! Low-impedance operation can damage the amplifier! The data sheet shows you which connection the respective amplifier is designed for!

Our port calculator shows you which tuning your enclosure has! The net volume is always particularly important here; calculate the pure chamber of the subwoofer beforehand to arrive at the correct result. The net volume is calculated minus all displacements and is important when designing the enclosure.

Downloads

Bedienungsanleitung

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The Ground Zero GZA 125.4-30A Limited Edition was developed to mark the company’s 30th anniversary and is designed for discerning audio enthusiasts seeking uncompromising sound quality. This high-quality 4-channel amplifier features a meticulously designed Class A/B circuit with extremely short, filter-free signal paths and select premium components. Thanks to the variable BIAS setting, the sound character can be individually adjusted between dynamic Class A/B operation and a particularly warm, nearly Class A-like sound.

High-quality operational amplifiers, carefully selected MUNDORF® audio capacitors, and an exceptionally high damping factor ensure precise speaker control, excellent spatial imaging, and the finest detail resolution. This makes the amplifier ideal for high-end front-channel systems, active speaker setups, or sophisticated multi-channel sound-quality systems.

Technical Specifications

4-Channel Class A/B Sound-Quality Amplifier
30th Anniversary Limited Edition
Variable BIAS control (Class A/B to near Class A)
Filter-free signal path for maximum sound fidelity
High-Quality OPA2134 Operational Amplifiers
Selected MUNDORF® Audio Capacitors
Optimized Power-On Delay
Gold-plated power, signal, and speaker connectors
Solid heat sink with a high-quality piano-black finish
RMS power at 4 Ω: 4 × 125 watts
RMS power at 2 Ω: 4 × 215 watts
Bridge power at 4 Ω: 2 × 480 watts
Frequency response: 5 Hz – 70 kHz (-3 dB)
Signal-to-noise ratio: 110 dB (A-weighted at 100 watts)
Total Harmonic Distortion (THD): < 0.005%
Damping factor: > 800
Input sensitivity: 0.8–6 volts (±5%)
Recommended speaker cable cross-sectional area: at least 1.5 mm²
Recommended power cable cross-sectional area: at least 25 mm²
Fuse rating: 2 × 40 A
Dimensions (W × H × L): 195 × 53 × 360 mm

Highlights

Designed for audio systems that demand uncompromising sound quality
Finely adjustable BIAS control for a custom sound profile
Exceptionally high control thanks to a damping factor of over 800
Premium components for maximum signal purity
Ideal for active front-channel systems or high-end multi-channel systems
Rugged construction with a solid heat sink design
Exclusive 30th Anniversary Limited Edition for discerning car audio enthusiasts.

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