Eternal Research Demon Box — Synth Resale Value
Keyboards and SynthsWhat a used Eternal Research Demon Box sells for on Reverb (median of 2 recent listings).
Eternal Research Demon Box value — Used $892.79. Prices updated July 2026.
Used
$892.79
New / Sealed
—
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Item details
- Brand
- Eternal Research
- Make
- Eternal Research
- Model
- Demon Box
- Year
- 2025–2026
- Finishes seen
- Black
- Used range
- $666.66 – $892.79
- Sample size
- 2 listings
Eternal Research Demon Box resale value
The used Eternal Research Demon Box has a median Reverb asking price of $892.79, ranging from $666.66 to $892.79 across 2 current listings.
What drives the price
For a used synth, vintage analog vs digital, working keys/sliders, polyphony, and original PSU move the price most. Vintage and limited runs command a premium; player-grade and modified examples sell for less.
Price guide
What this actually trades for — sold values by condition vs. what sellers are asking today
| Condition | Value | Based on |
|---|---|---|
| Used | $892.79 | eBay sold comps |
Frequently asked questions
- What is the current used price range for the Demon Box?
- Based on current listings, the used range for the Demon Box is between $666.66 and $892.79.
- What finishes are available for this model?
- The finishes seen for the Eternal Research Demon Box include Black.
- When was the Demon Box manufactured?
- This model was produced during the 2025–2026 period.
