Audio DB · Full specs
| Series | A&ultima |
| Form | Portable Player |
| ANC | No |
| Microphone | No |
Acoustic specs
Astell&Kern A&ultima SP4000T is Astell&Kern’s Portable Player, reference price $4299. Maker-published: (the maker publishes none of the headline figures).This review covers specs and connectivity only — no listening impressions.
1. Where it sits among its peers
We only track 1 Portable Player so far — too few to rank. This is a single-unit spec review; rankings come once the category passes 10.
2. How to read the numbers
We only track 1 Portable Player so far — too few to rank. This is a single-unit spec review; rankings come once the category passes 10.
3. Connections and use cases
Inputs/outputs: —.
4. Against its peers
We only track 1 Portable Player so far — too few to rank. This is a single-unit spec review; rankings come once the category passes 10.
5. Weaknesses worth stating
- No output power published — the one figure that says what headphones it can drive; without it you can only judge by connections and gain.
- No SNR figure, so the noise floor cannot be judged.
- Weight is not published, so portability cannot be judged from data.
6. Who it is for — and who it is not
- Desk-bound listeners: these units are designed around desktop size and power.
- Anyone unsure what it can drive: output power is missing, so confirm before buying.
Data note: every figure comes from maker-published specs recorded in our database (output power, SNR, THD, DAC chip, sampling rate, connections). No inferred values, no listening impressions; missing figures show as “—”.