Cadence 540 Watt 4-Channel 2-Ohm Class A/B Car Audio Amplifier QRS4.90GH

• Refined 4-Channel Power – Delivers up to 135 watts RMS per channel at 2 ohms or 270 watts bridged for a full, balanced audio system.
• Premium Class A/B Clarity – Offers rich, dynamic sound reproduction with detailed highs and smooth low-end response for audiophile-grade performance.
• Precision Sound Control – Adjustable HPF, LPF (50–250Hz), and Bass Boost up to +15dB at 45Hz for personalized tuning and sound shaping.
• Elegant and Durable Build – Black brushed aluminum chassis ensures strength, style, and superior heat dissipation under heavy use.
• Smart Protection System – Microprocessor-based real-time monitoring provides advanced protection from thermal, short circuit, overload, and DC faults.

Cadence 540 Watt 4-Channel 2-Ohm Class A/B Car Audio Amplifier QRS4.90GH

This Listing Includes:

• (1) Quartz Core QRS4.90GH 4-Channel Class A/B Car Amplifier

The Quartz Resonance Supreme QRS4.90GH brings elegance, versatility, and precision together in one refined amplifier. Designed for music lovers who crave clarity and control, this 4-channel powerhouse delivers up to 135 watts RMS per channel at 2 ohms or 270 watts bridged, providing the flexibility to drive speakers and subwoofers with authority. Its Class A/B architecture ensures warm, dynamic sound reproduction across the entire frequency range, while the black brushed aluminum chassis embodies both durability and sophistication. Engineered with advanced microprocessor protection and real-time monitoring, the QRS4.90GH offers reliability that matches its sound quality. From crystal-clear highs to deep, resonant lows, it delivers a truly immersive listening experience worthy of the Quartz Resonance Supreme name.

Specifications:

• Amplifier Type: Class A/B


• Channel Configuration: 4 Channels


• RMS Power @ 4 Ohms: 90 W x 4


• RMS Power @ 2 Ohms: 135 W x 4


• Bridged RMS Power @ 4 Ohms: 270 W x 2


• Frequency Response: 20 Hz - 30 kHz


• Input Sensitivity: 200 mV - 6 V


• Total Harmonic Distortion (T.H.D): < 0.05 %


• Signal-to-Noise Ratio: > 86 dB


• High-Pass Filter (HPF): 50 Hz - 250 Hz


• Low-Pass Filter (LPF): 50 Hz - 250 Hz


• Bass Boost: 0 - 15 dB @ 45 Hz


• Fuse Rating: 35 A x 2


• Input Type: RCA


• Operation Modes: Stereo, Bridge, or Tri-Mode


• Protection: Thermal, Short Circuit, Overload, DC Fault


• Construction: Black brushed aluminum heatsink


• Cooling System: Efficient heat dissipation with microprocessor monitoring

Dimensions:

• Length: 14.29 in (363 mm)


• Width: 7.56 in (192 mm)


• Height: 2.32 in (59 mm)


• Weight: 10 lbs


• Shipping Dimensions: 18 x 12 x 5 in

Accepted Payment Methods at Big Jeff Audio

At Big Jeff Audio, we strive to make your shopping experience as smooth as possible by offering a wide variety of payment options. Below is a complete list of the payment methods we accept:

Credit and Debit Cards

• Visa
• Mastercard
• American Express
• Discover
• Diners Club

Digital Wallets

• Amazon Pay
• Apple Pay
• Meta Pay (formerly Facebook Pay)
• Google Pay
• Shop Pay
• PayPal

International Payment Methods

• Bancontact
• iDEAL

Bank Transfers

• Zelle

Financing Options

We also offer financing options to make purchasing easier. Learn more about our financing options here.

• Klarna
• Affirm
• Sezzle
• Snap
• Acima
• Tiptop

If you have any questions or need assistance with payments, feel free to reach out to us at info@bigjeffaudio.com or call us at 737-BIG-JEFF.

Shipping Options and Delivery Time

Do You Offer Expedited Shipping?

Yes! At checkout, you can select from different shipping options:

• Standard Shipping: Free for orders over $100.
• Expedited Shipping: Available at an additional cost, calculated based on the weight and destination of your order.

How Long Does Delivery Take?

• Handling Time: Most orders are processed and shipped within 1 business day after receiving cleared payment. Occasionally, additional handling time may be required, but we’ll notify you if that’s the case.
• Standard Shipping: Typically takes 3-5 business days, though delivery may be affected by extreme weather or holidays.

What Happens If My Package Is Undeliverable?

If your package is refused or marked undeliverable and returned to us by the carrier, you’ll need to pay the full shipping cost to have the package resent. Alternatively, we can refund your order, minus the cost of shipping.

Why Can’t I Track My Order?

If you're having trouble tracking your order:

• Make sure you’ve received the shipping confirmation email with the tracking number.
• Log into your account on our website and use the “Check Your Order Status” button.
• If the issue persists, please refer to our detailed guide on tracking your order or contact our customer service team for further assistance.