Topping A90 vs Ferrum ERCO Gen 2: Which Amp Fits Your Desk?
By Headphones.com - Shop the best headphones and home audio | Published: 2026-10-26
Category: Comparisons
Compare the Topping A90 Discrete and Ferrum ERCO Gen 2 to decide which balanced DAC/amp deserves a spot on your desk. We break down the trade-offs.
Quick Answer
For most desktop listeners, the Topping A90 Discrete offers outstanding value as a dedicated balanced amp, while the Ferrum ERCO Gen 2 justifies its higher price by adding a high-performance DAC and advanced digital processing.
Price vs. Features: What Your Money Buys
The Topping A90 Discrete is priced at $419.30, making it an accessible entry point into high-end balanced amplification. The Ferrum ERCO Gen 2, at $1,230, costs nearly three times as much, but it bundles a high-resolution DAC and a headphone amp into one chassis, potentially saving you the cost of a separate DAC.
If you already own a quality DAC, the A90 Discrete lets you upgrade your amplification without paying for redundant circuitry. If you're starting from scratch or want a streamlined desktop setup, the ERCO Gen 2's all-in-one design could be more cost-effective despite the higher upfront price.
The DAC Question: Built-In vs. External
The ERCO Gen 2 includes a built-in DAC with PCM 768 kHz and DSD 512 support, plus Ferrum's SERCE DSP engine that applies an Apodizing digital filter to get the most from the DAC chip. This means you can plug in a USB source and start listening immediately, without needing a separate DAC.
The Topping A90 Discrete is purely an amplifier and pre-amplifier, so you'll need to pair it with an external DAC. This gives you the flexibility to choose a DAC that matches your taste, but it adds one more component to your desk and one more cable to manage.
The Trade-Offs
- Amplifier-First Approach: Choose the Topping A90 Discrete if you already own a good DAC and want to upgrade your amplification without paying for a built-in DAC you won't use. Pair it with your existing DAC to keep costs down.
- All-in-One Convenience: Choose the Ferrum ERCO Gen 2 if you prefer a single box that handles both DAC and amplification, simplifying your desk and cable management. You'll need to invest in the higher price, but you save on a separate DAC.
- Future-Proofing for High-Res Audio: If your music library includes high-resolution files up to PCM 768 kHz or DSD 512, the ERCO Gen 2's DAC is designed to handle them natively. For standard CD-quality files, the A90 Discrete with an external DAC is more than sufficient.
Key Product Facts
- Ferrum ERCO Gen 2 Balanced DAC & Headphone Amplifier: The ERCO Gen 2 features an improved I/V converter stage and SERCE's DSP engine with an Apodizing digital filter, supporting PCM 768 kHz and DSD 512. This means the ERCO Gen 2 can handle high-resolution audio files and uses advanced digital filtering to get the most out of its DAC chip, which is ideal for listeners with large hi-res libraries.
Ferrum ERCO Gen 2 Balanced DAC & Headphone Amplifier - Topping A90 Discrete Balanced Headphone Amplifier & Pre-Amplifier (Discontinued): The A90 Discrete includes an R2R volume relay, remote control, ground loop noise terminator switch, and a 12V trigger interface. These quality-of-life features make the A90 Discrete easy to integrate into a desktop system and help eliminate hum or noise in tricky setups, which is a common pain point for headphone amp users.
Topping A90 Discrete Balanced Headphone Amplifier & Pre-Amplifier (Discontinued)
Which One Is Right for You?
Best for
- Desktop listeners who already own a quality DAC and want a high-value balanced amp
- Audiophiles who appreciate convenience features like remote control and ground loop switches
Not for
- Listeners who want an all-in-one solution without a separate DAC
- Those who need native support for high-resolution PCM and DSD files
