A Casual's Review of the Roseselsa RS9039 Dongle DAC

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Disclaimer: Please note that I am not an audiophile, and this review does not delve into the technical aspects of the IEMs. My impressions are based on my personal preferences, and others may have different experiences with this product. I also have a very limited experience with audio products so please take this review with a grain of salt.

The Roseselsa RS9039 was lent to me as part of a review tour in the Philippines.

Pros

  • Powerful with up to 300mW power output for 4.4mm, 240mW for 3.5mm
  • Boosts bass but doesn’t let it bleed to higher frequencies
  • Works with all devices out of the box, just plug and play
  • Good price to performance value

Cons

  • No external buttons for controls

General Product Details

Package Inclusions

  • The RS9039 DAC/Amp
  • A USB-C to USB-C cable
  • A storage case
The DAC/Amp
  • The Dac is made of a bluish-gray cnc-ed aluminum material.
  • A 4.4mm and 3.5mm input is on one side and a light indicator on another.
  • The Roselsa branding as well as other details are printed in white ink on the top.
  • Under seems to be the electronic schematic of the DAC/Amp.
  • It weighs 14.6g, and the dimensions is small enough to pocket.
The Cable
  • It’s a black braided USB-C to USB-C cable, nothing special about it
The Storage Case
  • A large rubber coated clamshell case approximately 5 times the volume of the RS9039 that can only contain the DAC/Amp and its cable because of a molded base.
Subjective Review
General Usage Impressions
  • The Hola paired with the warm tuning of the RS9039 elevated the quality of this 20 USD headphones, giving me more rumble.
  • Meanwhile the Cloud’s bright tuning is toned slightly down, and the bass a bit more emphasized.
Comparison vs Hidizs S9 Pro Plus Martha
  • RS9039 has sightly better details
  • Other than that, both sound very similar to me.
Specification Roseselsa RS9039 Hidizs S9 Pro Plus Martha
Price 77.99 USD 89 USD
Weight 14.6g 17.7g
DAC Chip ES9039Q2M ES9038Q2M
3.5mm output 240mW 138mW
4.4mm output 300mW 180mW
External Controls none 2 buttons

Final Thoughts
The Roseselsa is a great DAC/Amp for the price, beating the Hidizs S9 Pro Plus Martha in terms of power output, size, and value. If you value buttons though, get the Hidizs Martha. If not, the RS9039 is a worthy contender.