Upgrading Your Hi-Fi System: Part 2 - The Amplifier

This guide was written by Phillip Powell, who has over 15 years of experience advising customers on amplifier support, power delivery, and system connectivity at FutureShop. This is Part 2 of the Upgrading Your Hi-Fi System series.

The Power Behind the Performance

Your amplifier is the powerhouse of your system, the critical link that takes a delicate signal from your source and delivers the energy your speakers need to come alive. While FutureShop doesn't specialise in selling amplifiers directly, we supply a wide range of supporting upgrades that help your existing amp reach its full potential. From clean, stable power to high-quality connections and vibration control, each improvement enhances precision, dynamics, and musical flow.

Why the Amplifier Matters

The amplifier defines how your music feels: its scale, grip, and control. A well-designed amplifier handles transient peaks effortlessly, maintains clarity at any volume, and keeps the tonal balance natural. Even the best amps, however, rely on the ecosystem around them. Power delivery, interconnect quality, and physical setup can all influence performance dramatically.

Optimising these supporting elements is often one of the most cost-effective ways to elevate your system's sound without replacing the amplifier itself.

Power Delivery: Clean Energy, Better Performance

Amplifiers draw high current, and their performance depends heavily on the quality of the mains supply. Voltage fluctuations, noise, and interference from household devices can all raise the noise floor, masking fine detail and texture.

Upgrading to audiophile-grade power cables, power blocks, and conditioners provides a cleaner electrical feed, allowing the amplifier to respond instantly to musical peaks and transients. The result: tighter bass, smoother highs, and a more open soundstage.

Notable products to explore:

• AudioQuest NRG-Z3: quiet, solid-core power cable improving current flow and resolution.
• Chord Company PowerHaus P6: high-end distribution block delivering ultra-low noise performance.
• PLiXiR BAC 400 Balanced Power Conditioner: balanced power conditioner offering a cleaner, quieter system baseline.
• QSA Black 13A UK Mains Fuse: noise-reducing audiophile fuse enhancing dynamics and tonal purity.

Recommended categories: Power cables, power blocks, power conditioners, fuses

For a fuller explanation of why mains power affects sound quality, our guide Do Hi-Fi Mains Power Cables Really Make a Difference? covers the question in detail.

Interconnects: Preserving the Signal

The cables connecting your source to your amplifier, or your amplifier to an external preamp, play a crucial role in signal preservation. Poor-quality cables can introduce noise, roll off high frequencies, or reduce stereo separation.

High-purity copper conductors, solid shielding, and well-made connectors ensure the amplifier receives an accurate, low-noise signal from your source.

Notable products to explore:

• Tellurium Q Black II RCA Interconnects: smooth, natural analogue performance with strong midrange presence.
• AudioQuest Red River XLR Audio Cable: balanced interconnect offering warmth, transparency, and low noise.
• Entreq Macro Kit Grounding Box and Cable: effective grounding for lowering noise floor and improving clarity.

Recommended categories: Analogue interconnects, balanced XLR cables

If you are deciding between RCA and XLR connections for your amplifier, our RCA vs XLR guide explains when each is the right choice and when XLR offers no real advantage.

Speaker Connections: Control and Cohesion

An amplifier's control over your speakers depends not only on its design but also on the resistance and conductivity of the speaker cables. Low-quality or mismatched cables can cause tonal imbalance or blurred transients.

Upgrading to properly terminated speaker cables with quality conductors and plugs ensures efficient energy transfer, consistent impedance, and improved coherence.

Notable products to explore:

• QED Reference XT40i Speaker Cable: clean, controlled sound with excellent timing and bass handling.
• AudioQuest Rocket 11 Bi-Wire: flexible bi-wire cable offering open, detailed presentation.
• QED Silver Spiral Jumper Cables: high-end jumpers designed for speed, detail, and dynamics.

Recommended categories: Speaker cables, banana and spade terminations, jumper cables

Isolation and Support

Amplifiers generate heat and are sensitive to vibration. Placing them on a stable rack or adding isolation accessories can reduce resonance and improve timing and focus.

Notable products to explore:

• Atacama Apollo Podium 6 Hi-Fi Rack: rigid, stable rack offering excellent vibration control.
• TCI Cables Equipment Isolation Platform: isolation platform improving stability and component performance.
• Node SS-1 Equipment Isolation Feet: compact isolation feet enhancing sonic precision.

Recommended categories: Hi-fi racks, system isolation accessories

Amplifier Support Upgrades: What to Prioritise First

The four categories above each contribute to amplifier performance. The right sequence depends on whether you are using an integrated amplifier or a pre-power separates system, because the priority of the interconnect upgrade differs significantly between the two.

Integrated amplifier systems:

1. Power cable on the amplifier. The integrated amplifier is typically the highest current-drawing component in the system and the one where a quality power cable produces the most immediately audible result: tighter bass, better dynamic headroom, and a lower noise floor. If the system is already on a quality power block, a single cable upgrade on the amplifier is productive. If the system is not yet on a quality power block, addressing that first is the better order, as noted in Part 4: Power and Grounding.
2. Interconnect from source to integrated amplifier. Once the amplifier's power is clean, the interconnect between source and amplifier is the next productive step. Any noise in the signal at this point is amplified alongside the music by the full gain of the amplifier stage. A quality RCA or XLR cable here produces a more open and natural midrange and improved stereo imaging. Confirm whether your integrated amplifier is genuinely balanced before choosing XLR: many integrated amplifiers include XLR sockets that are single-ended internally, in which case RCA is the more direct and productive connection. The RCA vs XLR guide explains how to check this.
3. Speaker cable. After power and interconnect, the speaker cable completes the signal path between amplifier and speakers. A quality cable here improves timing, bass control, and midrange clarity. For the brand-level decision at this stage, the Atlas vs QED vs Chord Company guide provides a direct comparison of the three most commonly recommended British brands.
4. Isolation feet under the amplifier. Once power and signal cables are addressed, isolation feet under the amplifier reduce the vibration feedback from the speakers and the rack surface, which is more audible in high-current amplifiers with large transformers than in modestly powered designs.

Pre-power separates systems:

1. Power block or conditioner first, covering both components. In a separates system, the preamplifier and power amplifier each draw from the mains independently. Connecting both to a single quality power block immediately establishes one ground reference, which reduces the risk of ground loops between the two components via the interconnect between them.
2. Interconnect from source to preamplifier. In a separates system, the preamplifier handles the signal at its lowest level, before any voltage gain. The interconnect at this point is the most sensitive link in the chain: any noise here is amplified twice (by the preamp and then by the power amp). Prioritise this connection before the preamp-to-power-amp interconnect.
3. Interconnect from preamplifier to power amplifier. This connection carries the signal after preamplification, at higher voltage but still before the power stage. In a genuinely balanced system (where both preamp and power amp have true balanced circuits), XLR is the correct choice here and the long cable run between the two components makes the balanced noise rejection relevant. In a single-ended system, RCA is typically more direct.
4. Power cables on each component. In a separates system, the preamplifier is the higher priority for a cable upgrade than the power amplifier. The preamp handles lower signal levels and is more sensitive to power noise than the power amplifier's robust internal supply. Address the preamplifier's cable first, then the power amplifier.
5. Speaker cable and isolation follow the same priority as in an integrated system.

The Takeaway

While the amplifier provides the muscle of your system, it performs at its best when supported by clean power, accurate cabling, and solid isolation. These upgrades reveal what your amplifier is truly capable of: greater dynamics, lower noise, and a sense of effortless control. With the right foundation, your existing amp can sound as if it's had an upgrade of its own.

If you are working through the full series, the previous instalment covers the source: Part 1: The Source. Next up is the speakers: Part 3: The Speakers. The complete series overview is in the series summary and index.

FutureShop stocks power cables, power blocks, interconnects, speaker cables, and hi-fi racks to support every aspect of amplifier performance, all backed by our 60-day money-back guarantee on cables. Not sure which upgrades are right for your amp? Get in touch with our team. With over 15 years advising customers on amplifier optimisation, we are happy to help.