Skip to content
Audiomania · AdvisorРусский
Radiotehnika Alfa 1.05 active subwoofer
  • Radiotehnika Alfa 1.05 active subwoofer — photo 2
  • Radiotehnika Alfa 1.05 active subwoofer — photo 3
  • Radiotehnika Alfa 1.05 active subwoofer — photo 4
active subwooferRadiotehnikaL179%

Radiotehnika Alfa 1.05 active subwoofer

203 mm, 60 W RMS · from 38 Hz · ported · LFE, line · extension 5/10 · room 10–20 m² · entry

27,990 RUBeachin store· Elektrozavodskaya (Moscow)

Instalment: Buy now, pay later: 0-0-10 at our expense

Delivery by: 2026-11-09

Buy on audiomania.ruCompareBook a listening session

prices and stock as of 2026-11-05

Audiomania expert verdict

A compact 8-inch ported subwoofer with a 60 W amplifier — the most affordable way to add foundation to bookshelf or active speakers in a 10–20 m² room. A real pairing: with Radiotehnika S-20N in 12 m² at an 80 Hz crossover and about 70 % level. It needs a separate cable, and auto-on only kicks in at a noticeable volume. AI draft, under review

Ask about Radiotehnika Alfa 1.05

Will it suit your amplifier or room, what else to buy, what to compare with.

03

In brief

Best if you are looking for:

  • small rooms of 10–20 m² where big speakers will not fit — owners are happy in 12 m² and “a small room” AI draft, under review
  • a “trifonic” with Radiotehnika S-20N bookshelves or active S-10NA — real pairings from an owner and a specialist AI draft, under review
  • dense, taut bass that fills even 25 m² AI draft, under review
  • a PC or desktop system with active speakers that have a sub output AI draft, under review
  • the best price-to-quality in its class — “5 plus for the money” AI draft, under review

Keep in mind:

  • auto-on only triggers at high volume and very low frequencies — two owners; at quiet levels the sub may “fall asleep” AI draft, under review
  • no cable in the box — you need a mono or Y subwoofer interconnect AI draft, under review
  • do not connect to a fixed-level AUX/rec output — a sub-out or pre-out is needed AI draft, under review
  • the manual and rear-panel photos were missing from the site; single-cable hookup is not described in the manual — Audiomania helps AI draft, under review
04

Product DNA

L179%

A structured sound passport: every value carries a source and a confidence.

Low-end extension
5calculated0.5
Music fit
6customers0.5
Cinema fit
not yet auditioned
Use scenarios
not yet auditioned
Optimal room area
10–20 m² (8–25)calculated0.5
Tier
entrycalculated1
What else you need
interconnectcalculated1
05

Sound profile

The profile appears after an Audiomania expert audition.

08

Sound character

No audition or professional review yet — below are only facts from the specs and calculations.

Technical reference

Low-frequency limit
38 Hzspec sheet0.75
Low-end extension
5calculated0.5
09

Use scenarios

Suits:

  • small 10–20 m² rooms and a “trifonic” with bookshelf speakers AI draft, under review
  • a PC system with active speakers (S-10NA) that have a sub output AI draft, under review
  • an entry-level home cinema in a small room AI draft, under review

Less suited to:

  • quiet evening listening — auto-on waits for a solid level AI draft, under review
  • loud parties and rooms above 25 m² — 60 W and 8 inches AI draft, under review
  • amplifiers with only a fixed-level output (AUX/rec) AI draft, under review
10

Technologies and construction

  • Thick, damped MDF cabinet

    What it is: A cabinet of thick MDF panels with effective damping; a removable grille — an MDF frame with cloth; 9.2 kg at 27 × 33 × 33 cm.

    Practical benefit: High stiffness and vibration resistance (description); owner: “quality build”.

  • 8-inch polypropylene-cone driver

    What it is: A 20 cm (8-inch) woofer with a polypropylene cone.

    Practical benefit: “Deep, controlled bass with minimal distortion” (description); owner: “dense, taut bass”.

  • Front slot port

    What it is: A slot-shaped bass-reflex port on the front panel.

    Practical benefit: A front port is not critical about the rear wall — the sub can sit by a wall (description: “even distribution of low frequencies”).

  • 60 W class D amplifier

    What it is: A built-in class D amplifier rated at 60 W (not in the table; confirmed by a specialist).

    Practical benefit: Enough for 10–20 m² rooms; “stable sound quality even at high volume” (description).

  • 40–120 Hz crossover, 0/180° phase, auto-on

    What it is: A 40–120 Hz crossover control, a 0/180° phase switch, signal-sensing auto-on; an RCA input (stereo line/LFE).

    Practical benefit: Lets the sub match bookshelf speakers (owner: 80 Hz with S-20N); per reviews auto-on only triggers at a noticeable level.

11

Amplifier requirements

Music fit
6customers0.5
12

Which speakers it suits

  • DALI Opticon 2 MK2 bookshelf speakersrecommended

    118,990 RUB · in stock

    Why

    DALI Opticon 2 MK2 rolls off at 59 Hz: for music we recommend an active subwoofer, crossover ≈60 Hz; hookup: via sub out, pre-out or speaker level — check the amp's outputs.

  • ELAC Debut B6.3 bookshelf speakersoptional

    44,900 RUB · in stock

    Why

    ELAC Debut B6.3 reaches 48 Hz — a subwoofer is optional for music (crossover ≈60 Hz; hookup: via sub out, pre-out or speaker level — check the amp's outputs).

  • KEF Q150 bookshelf speakersoptional

    29,000 RUB · in stock

    Why

    KEF Q150 reaches 51 Hz — a subwoofer is optional for music (crossover ≈60 Hz; hookup: via sub out, pre-out or speaker level — check the amp's outputs).

  • KEF Q750 floorstanding speakersoptional

    99,000 RUB · in stock

    Why

    KEF Q750 reaches 48 Hz — a subwoofer is optional for music (crossover ≈60 Hz; hookup: via sub out, pre-out or speaker level — check the amp's outputs).

16

Comparison with similar models

No similar models in the catalog yet.

17

Specifications

Main

Amplifier power
RMS, W: 60; class: class DAudiomania specialist
Low-frequency limit
38 Hz
Crossover
range, Hz: 40–120; no: LFE bypass
Phase
0/180° switchAudiomania
Auto-on
yesAudiomania
Placement DSP
Audiomania

Construction

Enclosure
portedAudiomania
Finishes
Black Ash

Drivers

Driver
MM: 203; cone: полипропилен; position: front

Connection

Inputs
LFE, stereo line; no: speaker level

Dimensions

Dimensions (W×H×D)
270 × 329 × 329 mm

Weight

Weight
9.2 kg

Box contents

Warranty
24 months
18

Documents

No documents yet.

19

FAQ

›What is the subwoofer's power?
“The subwoofer has an amplifier rated at 60 W” (Audiomania specialist, 2026-01-12); a class D amplifier. The spec table does not list power.
›My class D amplifier has an AUX output — can I connect the sub to it for quiet music?
“Not recommended: the output is fixed-level; it is apparently a record output” (Audiomania specialist, 2026-05-23). You need a variable output — sub-out or pre-out; if there is none, check the amplifier model with a specialist.
›Will it suit Radiotehnika S-10NA active speakers in a 3.5 × 3.5 m room with a PC (films and music)?
“The Radiotehnika S-10NA speakers have a subwoofer output; connect with an Inakustik Premium Mono Sub cable — a suitable option for the room” (Audiomania specialist, 2026-01-25).
›Which crossover and level settings for a pairing with Radiotehnika S-20N?
An owner in 12 m²: “complements the bass perfectly at an 80 Hz crossover and about 70 % level”, the sub perpendicular to the speakers. By rule (S-20N f3 55 Hz × 1.3) the starting point is 70 Hz and 50 % level, then by ear. AI draft, under review
›The sub does not wake up at low volume — is that normal?
Yes, it is a trait of the auto-on: two owners write that it “only triggers at high volume and very low frequencies” and “reacts to recordings with solid bass”. Fixes: raise the amp's sub-out/pre-out level and compensate with the sub's own level control, feed both inputs (Y-cable), or keep the sub powered manually for quiet sessions. AI draft, under review
›Is there a cable in the box, and which one do I need?
No cable (“no cable in the box” — owner). The input is a stereo line/LFE RCA pair: from a mono sub-out — one RCA cable (the specialist suggested the Inakustik Premium Mono Sub), from pre-out L/R — a stereo pair or a Y-sub cable.
›What are the dimensions and weight?
270 × 329 × 329 mm (W × H × D), 9.2 kg.
›Where are the manual and rear-panel photos?
As of 2026-01-03 the specialist wrote: “the manual and extra images are being prepared”. The page has no PDF link; an owner notes that single-cable hookup is not described in the manual — Audiomania specialists help with connection.
›What room size is it for?
By rule 10–20 m² (8-inch driver, 60 W); owners are happy in 12 m² and even 25 m² (“fully covered”). The maker aims it at small rooms, trifonic setups and home cinema. AI draft, under review
›Does the subwoofer need a separate amplifier?
No: a subwoofer is a separate active speaker with its own amplifier; connect it to a line output or the speaker terminals.
20

Customer reviews

4.7 of 5 · 6 ratings

  • Антон А., Волгоград · 2026-06-20verified purchase

    Прекрасный сбвуфер. Сочетание цена-качество, как и у всей линейки Radiotehnika идеальны. Плюсы: - Качественная сборка - Плотный и упругий бас. Комната в 25 м2 охвачена полностью - Компактные размеры -Универсальный дизайн. Вписывается в любую обстановку Минусы: - Нет кабеля в комплекте - Автоматическое включение срабатывает только на большой громкости и очень низкой частоте - В инструкции вообще не описано подключение к колонкам монопроводом. Пришлось звонить ребятам с Audiomania и они уже помогли.

  • Геннадий Р., Усть-Лабинск · 2026-03-17Goodverified purchase

    Покупался для комнаты 12 КВ.м. работает совместно с колонками радиотехника s20n. Дополняет бас отлично при настройке частоты среза 80 Гц и громкости процентов 70. Расположение сабвуфера перпендикулярно относительно колонок . Доставка быстрая всё хорошо дошло. Спасибо магазину и отдельно Михаилу Портянскому.

  • Андрей П., Москва · 2026-01-01Excellentverified purchase

    Сабвуфер приобретал для небольшого помещения. Для своей цены работу выполняет на 5 с плюсом.

22

Audiomania expert opinion

The Alfa 1.05 is the entry subwoofer of the revived Radiotehnika: a thick MDF cabinet, a 20 cm polypropylene driver, a front slot port and a 60 W class D amplifier. Owners praise the “dense, taut bass” and the build, and one says it fills a 25 m² room. AI draft, under review[5]

The main caveats are practical: no cable in the box, the manual does not describe single-cable hookup, and auto-on waits for a solid signal level. For quiet evening listening keep the sub powered manually or raise the amplifier's sub-out level. AI draft, under review[4]