FiiO JM21 Review: Best Budget Sub-DAP Under $150

I managed to pick up the older FiiO JM21 3GB+32GB model for $110! It is an Android portable audio player powered by the Snapdragon 680 chipset with up to 700mW of output power. While it offers a lightweight 150g build and snappy performance, the 3GB RAM and 32GB storage impose clear limitations. Its true value shines when used as a dedicated streaming device for a single app or as a digital transport connected to an external DAC, rather than as a heavy primary device.

Specs Hard to Find in the Sub-$150 Price Bracket

The internal layout features a fully balanced architecture built around a dual CS43198 DAC and SGM8262 OP-AMP combination. Running on Android 13 with FiiO DAPS applied, it bypasses system-level sample rate conversion (SRC). The most noticeable upgrade is the application processor (AP). While competing entry-level devices rely on sluggish older chipsets, the Snapdragon 680 makes navigating and launching streaming apps remarkably smooth.

Weighing in at 156g with a 13mm thickness and a 4.7-inch display, it fits comfortably in one hand. The device supports two-way Bluetooth and both UAC 2.0/1.0 protocols, allowing it to function as a USB DAC for gaming consoles. With a standby power consumption of just 1.5mW, it also serves brilliantly as a pure digital source when paired with an external amplifier like the Mojo 2.

Real-World Pros and Cons

This is a device with sharply defined strengths and weaknesses. An output of 700mW into 32 ohms via the 4.4mm balanced output is virtually unheard of at this price point. However, due to the 3GB RAM limitation, the manufacturer explicitly recommends running music apps as single, isolated tasks.

Key Pros

• Exceptional output power for the price (700mW via 4.4mm jack)
• Dual CS43198 chip configuration outperforms peers in this class
• Snapdragon 680 ensures smooth streaming app performance
• Lightweight 150g build for superior portability

Cons

• Physical buttons feel loose and are positioned on both sides, leading to accidental presses
• Protruding screen design combined with shallow default case lips offers poor drop protection
• Usable storage sits around 22GB, making a MicroSD card essential for offline caching

The lack of a system-wide global EQ forces users to rely on third-party apps like Wavelet, which can be inconvenient. The plastic body housing—aside from the metal frame—is acceptable given the price tag.

Battery Spec Differences: Older 3G vs. Newer 4G Model

When hunting for the older 3G model, you must clearly distinguish it from the newer 4GB+64GB variant. The differences go beyond mere RAM and storage upgrades; the battery capacities are entirely different. The older 3G model packs a 2,400mAh battery delivering up to 12.5 hours of playback via 3.5mm and 9.5 hours via 4.4mm. Conversely, the newer 4G model upgrades to a 3,100mAh battery, extending max playback time to 16 hours. Keep this in mind to avoid confusing the older unit with the newer battery specs.

Used Market Analysis: Why Buying Brand New via Direct Import is the Smart Choice

I just scrolled through recent completed secondhand marketplace listings. The used market price for the 3G+32G older model consistently clusters between 130,000 KRW and 150,000 KRW. While quick-sale bargains occasionally pop up around 80,000 KRW or 100,000 KRW, they vanish instantly. Thanks to the exceptional value proposition of the hardware, its secondhand price retention is remarkably high.

Meanwhile, the upgraded 4G+64G new variant trades anywhere from 180,000 KRW up to 240,000 KRW. This is precisely where direct importing becomes compelling. Rather than spending 140,000 KRW on a pre-owned, used device, you are better off applying discount codes to grab a brand-new, unopened unit for around 150,000 KRW. Skip the hassle of refreshing marketplace listings and just order it direct.

Grab the FiiO JM21 for $110

https://s.click.aliexpress.com/e/%5Fc3HjUj2r

Offered at an aggressively low price-to-performance ratio, I pulled the trigger on this myself. By stacking AliExpress discount promotions, you can secure it for $110.80. Follow these simple steps:

1. Access the purchase link above and add the FiiO JM21 to your cart.
2. ($18.18 Coin Discount) Enter the AliExpress coin shop menu and apply the coin discount to the item in your cart.
3. ($1.79 Store Discount) Click the store coupon link on the product page to claim the coupon (S6HKPTR8X0Q9).
4. ($24 Ali Coupon) Apply the exclusive promotional discount code (ALIKOL24) at checkout.
5. ($16 Card Discount) Select a participating payment method for instant card savings, bringing your final total down to $110.80.

This device packs 700mW of high output power and Android convenience into a budget-friendly package. Once you set it up for single-app usage, you won’t find a better pocket-sized toy to use as a secondary rig. I already bought mine, so jump in without regrets! Haha