SPECTERA・頻譜推演 — 一條 6 MHz,裝下整場演出

第二幕・CHAPTER 02ACT 02

時間軸推演:同一條通道,輪流全速The Time Domain: One Channel, Taking Turns at Full Speed

WMAS 的空中介面由三件事組成:TDMA(分時多重接取)把整條 6 MHz 按時間切片分配給各音訊鏈路,TDD(分時雙工)讓上行與下行在單一電視頻道內逐槽交錯——史上第一次,麥克風、IEM 與 IFB 共存於同一頻道,不需保護頻帶。輪到誰,誰就用全部頻寬。The WMAS air interface is built from three things: TDMA (time-division multiple access) slices the full 6 MHz in time and assigns it to each audio link; TDD (time-division duplex) interleaves uplink and downlink slot-by-slot within a single TV channel — for the first time, mics, IEMs and IFB coexist on one channel with no guard band. Whoever's turn it is gets the full bandwidth.

時槽Slot 01 / 16・縱軸為 6 MHz 全頻寬,橫軸為時間vertical = 6 MHz full bandwidth, horizontal = time

讀法:每一格直條代表一個時槽內、某條鏈路佔用整個 6 MHz 的瞬間。青色向上=麥克風上行,紫色向下=IEM 下行,琥珀色向下=IFB 對講迴路;訊框末端的灰色 SCAN 為靜默時槽——保留的空白片刻,讓系統在運作中持續進行分散式頻譜掃描與干擾感知,不需停機(其「每訊框一次、置於框尾」之配置係依原廠示意圖之單數用詞與分離尾欄推測,週期與位置未經官方文件明確說明)。How to read it: each vertical bar is one instant in which a link occupies the entire 6 MHz within a slot. Cyan up = mic uplink, violet down = IEM downlink, amber down = IFB talkback; the grey SCAN at the end of the frame is the silent slot — a reserved blank moment that lets the system keep doing distributed spectrum scanning and interference sensing while running, with no downtime (its "once per frame, at the tail" placement is inferred from the singular wording and separated tail column in the manufacturer's diagram; the period and position are not explicitly stated in official documentation).

上下行逐槽交錯即為 TDD,且收發週期長度可調——可全為麥克風、全為 IEM、或任意混合;掃描線就是「現在」。Uplink and downlink interleaving slot-by-slot is TDD, and the TX/RX period lengths are adjustable — all mic, all IEM, or any mix; the scan line is "now."

TDMA 為突發傳輸:任一瞬間整條通道內僅有一台裝置在發射,其餘裝置靜默——腰包(SEK)發射功率上限 50 mW,約一支傳統無線麥克風的功率;系統在容量上限內不會因裝置數增加而疊加總功率,這也是腰包省電的原因之一(天線端 DAD 與基地台另可於 10–100 mW 間依法規調整)。TDMA is burst transmission: at any instant only one device transmits in the whole channel while the rest stay silent — the bodypack (SEK) tops out at 50 mW, about the power of a single conventional wireless mic; within the capacity limit the total power does not add up with device count, which is part of why the bodypack saves battery (the DAD antenna and Base Station are separately adjustable between 10–100 mW per regulation).

64 槽檢視為單一載波之滿載示意——對應一台基地台 64 音訊通道(32 進 / 32 出)的處理上限。這就是「一場演出裝進一條 6 MHz」的調度表長相(每個載波可配對多達 128 台腰包待命,一台基地台最多可同時開兩條載波,見第五幕);實際空中介面之訊框結構未公開,兩種檢視皆為教學示意。The 64-slot view illustrates a single carrier at full load — corresponding to one Base Station's 64 audio channels (32 in / 32 out) processing ceiling. This is what "a show inside one 6 MHz" looks like as a schedule (each carrier can pair up to 128 bodypacks on standby, and one Base Station can run up to two carriers at once — see Act 5); the actual air-interface frame structure is not published, so both views are teaching illustrations.

把兩個維度攤成同一張圖:橫軸是時間(時槽),縱軸是頻率(子載波)。切換兩種制式,看同一張資源格被「直切」還是「橫切」。Lay both dimensions on one grid: time (slots) horizontal, frequency (subcarriers) vertical. Toggle the schemes to see the same resource grid sliced vertically vs horizontally.

第三幕・CHAPTER 03ACT 03

30 倍分集:為什麼寬頻更難掉訊30-Fold Diversity: Why Broadband Resists Dropouts

先看一個反直覺的數字:依原廠白皮書的鏈路預算計算,一支典型無線麥克風(200 kHz、10 dBm)的自由空間理論距離將近 17 公里——但實務上 100 公尺內就會掉訊。結論:無線麥克風從來不是距離問題,是多重路徑快衰落問題。場館裡的反射波在頻譜上挖出移動的「衰落凹槽」,原廠實測顯示窄帶 200 kHz 載波遇凹槽時可瞬間跌落約 25 dB;而 6 MHz 以上的寬頻傳輸,衰落變成「頻率選擇性」——凹槽只咬掉一小角,音訊在數百個 OFDM 子載波上冗餘承載,一、兩個凹槽打不掉任何一條。Sennheiser 的說法是:6 MHz 通道相當於 30 倍頻率分集。可讓凹槽自動漂移,或切到手動模式,親手把凹槽推到窄帶載波上——盯著兩邊的狀態燈看。Start with a counterintuitive number: per the manufacturer's white-paper link budget, a typical wireless mic (200 kHz, 10 dBm) has a free-space theoretical range of nearly 17 km — yet in practice it drops out within 100 m. The conclusion: wireless mics were never a range problem, they're a multipath fast-fading problem. Reflections in a venue carve a moving "fading notch" into the spectrum; the manufacturer's measurements show a narrowband 200 kHz carrier can plunge about 25 dB when it hits a notch. With broadband transmission of 6 MHz or more, fading becomes "frequency-selective" — the notch only bites off a small corner, while the audio is redundantly carried across hundreds of OFDM subcarriers, so one or two notches can't take down any link. Sennheiser's framing: a 6 MHz channel is equivalent to 30-fold frequency diversity. Let the notch drift automatically, or switch to manual and push it onto the narrowband carrier yourself — watch the status lights on both sides.

下方放大鏡:先看清 6 MHz 裡面是什麼,再看凹槽怎麼咬、為什麼咬不死。The magnifier below: first see what’s inside the 6 MHz, then watch how the notch bites — and why it can’t kill the link.

凹槽位置Notch position —

窄帶載波(200 kHz)Narrowband carrier (200 kHz)

● 正常● Stable

WMAS 通道(6 MHz)WMAS channel (6 MHz)

● 穩定● Stable

示意:白色曲線為通道頻率響應,凹陷處即多重路徑造成的選擇性衰落(原廠 482 MHz 與 1375 MHz 戶外 walk test 實測:200 kHz 載波衰落深度約 25 dB,6 MHz 接收功率近乎平穩)。公允地說,寬頻並非沒有代價:頻寬放大,熱雜訊底隨之升高,自由空間理論距離縮短——但白皮書的結論是,實際環境中省下的衰落餘裕遠超過此損失。Illustration: the white curve is the channel's frequency response; the dips are selective fading caused by multipath (manufacturer's 482 MHz and 1375 MHz outdoor walk tests: a 200 kHz carrier fades ~25 dB deep, while the 6 MHz received power stays nearly flat). To be fair, broadband isn't free: widening the bandwidth raises the thermal-noise floor and shortens the free-space theoretical range — but the white paper concludes that the fading margin saved in real environments far outweighs this loss.

第五幕・CHAPTER 05ACT 05

部署格局:從一整櫃,到 1RUDeployment: From a Full Rack to 1RU

頻譜規則改寫之後,硬體跟著塌縮。接收機牆、合成器、分配器、IEM 發射機——整套基礎設施收進一台基地台與雙向天線。Once the spectrum rules are rewritten, the hardware collapses with them. The receiver wall, combiners, splitters, IEM transmitters — the entire infrastructure folds into one base station and bidirectional antennas.

BASE STATION1RU・64 通道・雙載波1RU · 64 ch · Dual carrier

單一機架單位提供 32 in / 32 out,可同時開兩個獨立寬頻載波——能跨兩個電視頻道、甚至 UHF 與 1G4 各一個,或分配給不同區域做多區覆蓋。冗餘電源、冗餘 Dante、選配冗餘 MADI。一台取代過去一整櫃的接收機與 IEM 發射機。A single rack unit delivers 32 in / 32 out and can run two independent wideband carriers at once — across two TV channels, or one UHF and one 1G4, or assigned to different zones for multi-zone coverage. Redundant power, redundant Dante, optional redundant MADI. One unit replaces a whole rack of receivers and IEM transmitters.

SEK BODYPACK一顆腰包,雙向收發One bodypack, bidirectional

同一顆 SEK 同時處理麥克風/線路上行與 IEM/IFB 下行,並持續回傳電量、RF 狀態與音訊電平。演出者少帶一顆腰包,工程師遠端即時掌握每條鏈路。A single SEK handles both mic/line uplink and IEM/IFB downlink simultaneously, while continuously reporting battery, RF status and audio levels. Performers carry one fewer bodypack; engineers monitor every link remotely in real time.

SPECTRUMUHF 470–698 · 1G4 1350–1525 MHz

UHF 版涵蓋 470–608 與 630–698 MHz 兩子段,1G4 版另有變體;每寬頻通道發射功率依各國法規可調(10–100 mW),典型約一支傳統無線麥克風的功率,卻承載整場演出。台灣現況:對應官方授權品項 SPECTERA LIC (ZONE 15),頻段 UHF 510–530 與 630–698 MHz(與 NCC 核發一致),皆落在 Spectera UHF 版範圍內,可完整部署;頻譜經 license 依區域認證啟用。The UHF variant covers two sub-bands, 470–608 and 630–698 MHz, with a separate 1G4 variant; per-channel TX power is adjustable per national regulation (10–100 mW) — roughly the power of one conventional wireless mic, yet it carries the whole show. Taiwan status: the official license item is SPECTERA LIC (ZONE 15), bands UHF 510–530 and 630–698 MHz (matching the NCC allocation), both within the Spectera UHF variant range — fully deployable; spectrum is enabled per region by license.

CONTROL11 種 Link Mode・三層編碼11 Link Modes · 3 codec tiers

延遲依模式而定:立體聲低至 0.7 ms、單聲道低至 1.0 ms(各模式至 15.2 ms 不等)。三層編碼:Opus、SeDAC(專業級),到全無壓縮 PCM,最高 24-bit/96 kHz。每條鏈路獨立設定、可隨時切換不需重開機。SEK 腰包續航:單向麥克風約 7 小時、單向 IEM 約 6 小時、雙向約 5 小時(BA 70 電池)。Latency depends on mode: stereo as low as 0.7 ms, mono as low as 1.0 ms (up to 15.2 ms across modes). Three codec tiers: Opus, SeDAC (professional grade), through to fully uncompressed PCM, up to 24-bit/96 kHz. Each link is independently configured and switchable any time without rebooting. SEK runtime: ~7 h mic unidirectional, ~6 h IEM unidirectional, ~5 h bidirectional (BA 70 battery).

DAD ANTENNARF 在天線端就數位化RF digitized at the antenna

收發天線同時處理 IEM、麥克風與資料。RF 訊號於天線端直接數位化,經 CAT 5e 點對點傳輸、標準 PoE 供電,可轉光纖延伸——同軸線、合成器、分配器整套消失。The transceiving antenna handles IEM, mic and data at once. The RF signal is digitized right at the antenna, carried over point-to-point CAT 5e with standard PoE, and extendable via fiber — coax, combiners and splitters all disappear.

MULTI-PACK同一 mix,不佔容量Same mix, no capacity cost

多顆腰包接收同一路混音不消耗額外通道容量。劇場群眾、來賓 IFB、樂手 cue mix 這類「一對多」場景,部署成本結構與傳統窄帶完全不同。Multiple bodypacks receive the same mix with no extra channel capacity used. For one-to-many scenarios — theatre ensembles, guest IFB, musician cue mixes — the deployment cost structure is fundamentally different from conventional narrowband.

第六幕・CHAPTER 06ACT 06

壓力實測:把所有禁忌做一遍Stress Test: Doing Everything You Shouldn't

2023 年,兩位獨立頻率協調師(Marco Völzke 與 Jonas Naesby)對 WMAS 原型機做了一場刻意「把所有教科書禁忌都做一遍」的共存與壓力測試。用 Naesby 的話說:故意把每件事都做錯,看系統會不會垮。以下是三個階段的結果。In 2023, two independent frequency coordinators (Marco Völzke and Jonas Naesby) ran a coexistence and stress test on a WMAS prototype, deliberately "doing every textbook no-no." In Naesby's words: get everything wrong on purpose and see whether the system collapses. Here are the results, in three stages.

STAGE 1・共存STAGE 1 · Coexist住進「禁區」保護頻帶Moving into the no-go guard band

WMAS 被刻意放進類比 IEM(高功率)與八通道數位 EW-DX 之間、頻率協調師從不使用的保護頻帶。結果:WMAS 零中斷,也完全沒干擾兩側的窄帶鄰居。傳統混合系統的保護頻帶常需 16 MHz、甚至三個電視頻道——這些「白白浪費的頻譜」WMAS 直接住進去。WMAS was deliberately placed between an analog IEM system (high power) and an eight-channel digital EW-DX, in the guard band coordinators never use. Result: zero dropouts for WMAS, and no interference to the narrowband neighbours on either side. Conventional mixed systems often need 16 MHz, even three TV channels of guard band — WMAS simply moves into that "wasted spectrum."

STAGE 2・帶內干擾STAGE 2 · In-band頻道正上方放干擾源Interferers right on the channel

模擬真實「意外」:ENG 採訪隊帶著未協調的設備進場、有人誤開舊頻點的窄帶麥克風——干擾源直接壓在 WMAS 使用中的頻道上。系統照常運作,還能可靠地偵測並回報這些窄帶干擾源的存在,予以抑制。Simulating real "accidents": an ENG crew arriving with uncoordinated gear, or someone switching on a narrowband mic on an old preset — interferers landing right on the channel WMAS is using. The system keeps running, and reliably detects, reports and suppresses these narrowband interferers.

STAGE 3・極限STAGE 3 · Extreme四支干擾源貼身近逼Four interferers in close proximity

四支帶內干擾發射機集中放置、近到天線互相碰觸——只有距干擾源僅數公分的那一顆腰包在約 80 公尺處開始掉訊;把干擾源移到 25 公分外,距離回升至 100 公尺以上。其餘通道全程穩定——「一條載波被打掉就全滅」的疑慮,被測試直接否定。Four in-band interfering transmitters clustered together, antennas nearly touching — only the one bodypack just centimetres from the interferers began dropping out at ~80 m; move the interferers 25 cm away and range recovered to over 100 m. All other channels stayed stable throughout — the fear that "one carrier knocked out means total loss" was directly disproven.

INSIGHT看得見自己頻道內的干擾Seeing interference on your own channel

協調師點出傳統盲區:頻譜儀只能監測你沒在用的頻率——有人壓在你的頻點上,你反而看不到。WMAS 持續掃描自身載波的本底雜訊(即第二幕的靜默時槽),是第一個能看見並協助定位帶內干擾源的系統。裝置一旦與基地台失聯,會在數秒後自動停止發射並嘗試重連——根除了演出者離場亂晃時非預期發射造成干擾的老問題。The coordinators flag a classic blind spot: a spectrum analyser can only monitor frequencies you're not using — if someone sits on your frequency, you can't see it. WMAS continuously scans the noise floor of its own carrier (the silent slot from Act 2), making it the first system that can see and help locate in-band interferers. If a device loses its link to the base station, it stops transmitting automatically within seconds and tries to reconnect — eliminating the old problem of stray transmissions when a performer wanders off.

法規面的定心丸:WMAS 並非專有黑科技,已正式納入歐洲標準 ETSI EN 300 422-1 的 WMAS 章節——這也是各廠牌得以推出寬頻系統的共同法規基礎。A regulatory reassurance: WMAS is not proprietary black magic — it's formally written into the WMAS chapter of European standard ETSI EN 300 422-1, the shared regulatory basis on which multiple manufacturers can launch broadband systems.

附記・NOTESNOTES

規格出處Sources

本頁所有數據之依據Sources for all data on this page

WMAS 原理(單一 6/8 MHz 電視頻道、時槽分配、麥克風與 IEM 同頻道、30×/40× 分集):Sennheiser Newsroom 官方新聞稿(發明人 Sebastian Georgi 與 Jan Watermann 之說明)。WMAS principles (single 6/8 MHz TV channel, slot allocation, mics and IEMs on one channel, 30×/40× diversity): Sennheiser Newsroom official press release (explained by inventors Sebastian Georgi and Jan Watermann).
基地台規格(1RU、32 in/32 out、雙寬頻載波、UHF 470–698 MHz 與 1G4 1350–1525 MHz、RF 功率 10–100 mW 依法規可調、冗餘電源/Dante、選配 MADI、AES-256):Sennheiser SPECTERA Base Station 產品規格書 v1.8。系統由 license 依區域定義可用頻譜與功能;依官方文案來源檔 V2.0(2026 年 4 月)之 license 列表,台灣對應 SPECTERA LIC (ZONE 15),頻段 UHF 510–530 與 630–698 MHz,與 NCC 核發一致。Base Station specs (1RU, 32 in/32 out, dual wideband carriers, UHF 470–698 MHz and 1G4 1350–1525 MHz, RF power adjustable 10–100 mW per regulation, redundant power/Dante, optional MADI, AES-256): Sennheiser SPECTERA Base Station spec sheet v1.8. The system defines available spectrum and functions per region by license; per the official Copy Source V2.0 (April 2026) license list, Taiwan corresponds to SPECTERA LIC (ZONE 15), bands UHF 510–530 and 630–698 MHz, matching the NCC allocation.
台灣電視頻道頻寬為 6 MHz 制,故本頁推演一律以「6 MHz・30 倍分集」為基準。Taiwan uses 6 MHz TV channels, so this walkthrough is based throughout on "6 MHz · 30-fold diversity."
第一幕之互調呈現:紅色尖峰為三階雙頻乘積(2f₁−f₂ 類,計數 N×(N−1));紅色密度層為三頻乘積(f₁+f₂−f₃ 類,計數 N×(N−1)×(N−2)÷2)之帶內分布,以密度示意而非個別尖峰。三頻乘積振幅較雙頻乘積高 6 dB,為大型系統頻率協調之主要限制。五階以上乘積未納入。Act 1 intermodulation depiction: red spikes are third-order two-tone products (2f₁−f₂ type, count N×(N−1)); the red density layer is the in-band distribution of three-tone products (f₁+f₂−f₃ type, count N×(N−1)×(N−2)÷2), shown as density rather than individual spikes. Three-tone products are 6 dB higher in amplitude than two-tone and are the main constraint in large-system coordination. Fifth-order and above are not included.
空中介面三支柱(TDMA 時槽分配、TDD 單一電視頻道內雙向通訊、OFDM 與通道編碼之頻率分集)、時槽序列含 IFB 迴路、以及靜默時槽(於運作中進行分散式頻譜掃描與干擾感知):Sennheiser 原廠講座投影片「The technology – The wideband advantage」(原始 PDF)。The three air-interface pillars (TDMA slot allocation, TDD bidirectional within a single TV channel, OFDM with channel coding for frequency diversity), the slot sequence including the IFB loop, and the silent slot (distributed spectrum scanning and interference sensing during operation): Sennheiser seminar slides "The technology – The wideband advantage" (original PDF).
第二、三幕為原理示意動畫,時槽數與曲線為教學用簡化,非實際空中介面參數。Acts 2 and 3 are conceptual animations; slot counts and curves are teaching simplifications, not actual air-interface parameters.
第三幕之子載波放大檢視為原理示意:OFDM 子載波之實際數量與參數未公開,圖中以百餘根等寬直條示意;凹槽影響範圍與編碼救援為概念呈現,對應白皮書「OFDM 結合通道編碼以利用頻率分集」之機制說明。The Act 3 subcarrier zoom is a conceptual illustration: the actual number and parameters of OFDM subcarriers are unpublished, so the figure stands in with a hundred-odd uniform bars; the notch extent and coding rescue are conceptual, matching the white papers’ description of “OFDM combined with channel coding to exploit frequency diversity.”
窄帶 200 kHz 衰落深度約 25 dB 之實測、OFDM 子載波冗餘機制、延遲依模式而定(立體聲最低 0.7 ms、單聲道最低 1.0 ms,最高 15.2 ms)、三層編碼(Opus / SeDAC / 全無壓縮 PCM,最高 24-bit/96 kHz)、每鏈路佔載波 0.78%–25%(含立體聲模式):Sennheiser SPECTERA 官方產品規格書(Base Station v1.8、SEK v1.4、DAD v1.4)與原廠線上研討會投影片。Measured ~25 dB fading depth for a narrowband 200 kHz carrier, OFDM subcarrier redundancy, per-mode latency (stereo min 0.7 ms, mono min 1.0 ms, max 15.2 ms), three codec tiers (Opus / SeDAC / fully uncompressed PCM up to 24-bit/96 kHz), per-link carrier occupancy 0.78%–25% (including stereo modes): Sennheiser SPECTERA official spec sheets (Base Station v1.8, SEK v1.4, DAD v1.4) and manufacturer webinar slides.
頻譜密度對比(窄帶每支發射機 17 dBm/200 kHz ≈ 50 mW,9 支合計 450 mW;WMAS 將 17 dBm 總功率攤平於寬頻通道,6 MHz 時約 2.23 dBm/200 kHz ≈ 1.66 mW、8 MHz 時約 0.97 dBm/200 kHz ≈ 1.25 mW,單位頻寬功率密度約為窄帶的 1/30):Sennheiser SPECTERA 原廠線上研討會動態投影片(2025 年 11 月)。Spectral-density comparison (narrowband: each transmitter 17 dBm/200 kHz ≈ 50 mW, nine total 450 mW; WMAS spreads 17 dBm total across the wideband channel, ~2.23 dBm/200 kHz ≈ 1.66 mW at 6 MHz, ~0.97 dBm/200 kHz ≈ 1.25 mW at 8 MHz, a per-bandwidth power density about 1/30 of narrowband): Sennheiser SPECTERA webinar animated slides (November 2025).
第四幕之模式參數(RF 佔用比、延遲、距離等級、編碼)逐項取自 Sennheiser 官方產品規格書 Audio Link Modes 表;距離分四級:Reduced／Standard／Extended／Maximum。「同模式滿載容量」為 100 ÷ 佔用比之理論換算;規格書確認每條鏈路可獨立設定模式、可隨時切換不需重開機。SEK 腰包續航(BA 70 電池):單向麥克風約 7 小時、單向 IEM 約 6 小時、雙向約 5 小時;腰包具持久顯示,電池移除後螢幕仍顯示名稱。Act 4 mode parameters (RF occupancy, latency, range tier, codec) are taken item-by-item from the Audio Link Modes table in Sennheiser's official spec sheets; range comes in four tiers: Reduced/Standard/Extended/Maximum. "Same-mode full capacity" is the theoretical 100 ÷ occupancy; the spec sheet confirms each link is independently mode-configurable and switchable any time without rebooting. SEK runtime (BA 70 battery): ~7 h mic unidirectional, ~6 h IEM unidirectional, ~5 h bidirectional; the bodypack has a persistent display that still shows its name after the battery is removed.
容量分三層,勿混為一談:(1)每個 RF 載波可配對多達 128 台行動裝置(SEK)待命;(2)單台基地台音訊處理上限為 64 通道(32 in / 32 out);(3)實際同時音訊鏈路數另受該載波所選 Audio Link Mode 佔用比限制(如 Live Link Density 每台 3.13%、滿載 32 條)。欲讓 128 台之音訊同時進出,需多台基地台級聯並待未來韌體。第二幕 64 槽檢視對應第(2)層之 64 音訊處理上限。來源:Sennheiser Spectera 線上操作手冊(05/2026)「Pairing the SEK to the Base Station」。Capacity has three layers, not to be conflated: (1) each RF carrier can pair up to 128 mobile devices (SEK) on standby; (2) a single Base Station's audio-processing ceiling is 64 channels (32 in / 32 out); (3) the actual number of simultaneous audio links is further limited by the Audio Link Mode occupancy chosen on that carrier (e.g. Live Link Density 3.13% each, 32 at full load). Running 128 devices' audio at once requires cascading multiple Base Stations and future firmware. The Act 2 64-slot view corresponds to layer (2), the 64-channel audio-processing ceiling. Source: Sennheiser Spectera online manual (05/2026), "Pairing the SEK to the Base Station."
鏈路預算計算(典型 200 kHz 無線麥克風自由空間理論距離約 17 km)、窄帶/寬頻 RF 通道之相干頻寬定義、寬頻之熱雜訊代價與衰落餘裕權衡、482 MHz 與 1375 MHz 戶外 walk test 實測、WMAS 納入 ETSI EN 300 422-1 標準:Sennheiser 技術白皮書「Why Broadband?」(Dr. Sebastian Georgi)。Link-budget calculation (typical 200 kHz wireless mic free-space theoretical range ~17 km), coherence-bandwidth definitions for narrowband/broadband RF channels, the thermal-noise cost vs fading-margin trade-off of broadband, outdoor walk tests at 482 MHz and 1375 MHz, and WMAS's inclusion in ETSI EN 300 422-1: Sennheiser technical white paper "Why Broadband?" (Dr. Sebastian Georgi).
第六幕之共存與壓力測試(置於保護頻帶運作、帶內干擾源偵測與抑制、四支貼身干擾源下其餘通道穩定、傳統保護頻帶可達 16 MHz 之說明):Sennheiser 官方新聞稿「Wireless Multi-Channel Audio Systems – The technology check」(2023 年 5 月,獨立頻率協調師 Marco Völzke 與 Jonas Naesby 之測試,基於 WMAS 原型機)。Act 6 coexistence and stress testing (operating in the guard band, detecting and suppressing in-band interferers, other channels stable under four close interferers, and the note that conventional guard bands can reach 16 MHz): Sennheiser press release "Wireless Multi-Channel Audio Systems – The technology check" (May 2023, testing by independent frequency coordinators Marco Völzke and Jonas Naesby on a WMAS prototype).
模式計數說明:官方以「11 種 Audio Link Mode」統稱;模式總表依用途分列共 15 欄(麥克風/線路 7、IEM/IFB 單聲道 4、立體聲 4),其中單聲道 IEM/IFB 之四個模式與麥克風同名模式參數完全相同,去除重複後恰為 11 種獨立模式,兩種計數並不矛盾。On mode counting: officially summarized as "11 Audio Link Modes"; the full table lists 15 columns by use (Mic/Line 7, IEM/IFB mono 4, stereo 4), where the four mono IEM/IFB modes share identical parameters with the same-named mic modes — removing duplicates leaves exactly 11 distinct modes, so the two counts do not conflict.
WMAS 三支柱之官方定義、50 mW 突發傳輸與「不隨裝置數疊加總功率」、TDD 收發週期可調、1/30 與 1/40 共存干擾計算(8 MHz 通道內窄帶接收機僅承受 <1.25 mW、WMAS 接收機承受 50 mW)、裝置失聯自動停止發射、ETSI TR 103 450 與 EN 300 422-1 標準依據、1G4 版 1350–1525 MHz:Sennheiser 技術白皮書「Insights into Frequency Coordination of Broadband WMAS and Narrowband Wireless Equipment」(Dr. Andreas Wilzeck,Head of Spectrum Policy and Standards)。The official definition of the three WMAS pillars, 50 mW burst transmission and "total power does not scale with device count," adjustable TDD periods, the 1/30 and 1/40 coexistence interference math (within an 8 MHz channel a narrowband receiver sees only <1.25 mW while a WMAS receiver sees 50 mW), automatic transmission stop on link loss, the ETSI TR 103 450 and EN 300 422-1 basis, and the 1G4 variant 1350–1525 MHz: Sennheiser white paper "Insights into Frequency Coordination of Broadband WMAS and Narrowband Wireless Equipment" (Dr. Andreas Wilzeck, Head of Spectrum Policy and Standards).
台灣頻段:NCC 核發 UHF 510–530 MHz 與 630–698 MHz;依官方文案來源檔之各國頻段表,Spectera UHF 版涵蓋 470–608 與 630–698 MHz,台灣核發之兩段皆完整落入,可部署。RF 功率依各國法規於 10–100 mW 間可調,頻譜經 license 依區域認證啟用。來源:Sennheiser「Spectera Copy Source V2.0」(2026 年 4 月)。Taiwan bands: the NCC allocates UHF 510–530 MHz and 630–698 MHz; per the per-country band table in the official copy source, the Spectera UHF variant covers 470–608 and 630–698 MHz, so both Taiwan segments fall fully within range and are deployable. RF power is adjustable 10–100 mW per national regulation, with spectrum enabled by region license. Source: Sennheiser "Spectera Copy Source V2.0" (April 2026).
系統主控與監看為 Sennheiser 原生軟體 LinkDesk(撰稿時版本 1.6.0)與 Spectera WebUI;基地台韌體撰稿時為 v1.3.3。SoundBase 原由美國 Show Code 開發,Sennheiser 集團已於 2024 年 9 月投資 Show Code 並將其納入發展體系,SoundBase SE/Pro 現列於 Sennheiser 官方軟體產品線,提供 Spectera Mode Planning 等規劃功能;其試算結果仍以官方規格文件為準。資料來源:Sennheiser 官方產品頁(spectera-base-station-509162)。System control and monitoring use Sennheiser-native software LinkDesk (v1.6.0 at time of writing) and Spectera WebUI; Base Station firmware was v1.3.3 at time of writing. SoundBase was originally developed by Show Code (USA); the Sennheiser Group invested in Show Code in September 2024 and brought it into its development framework, and SoundBase SE/Pro is now listed in Sennheiser's official software line, offering planning functions such as Spectera Mode Planning; its estimates still defer to official spec documents. Source: Sennheiser official product page (spectera-base-station-509162).

一條 6 MHz,
裝下整場演出。One 6 MHz
holds the whole show.

窄帶時代的頻譜戰場The Narrowband-Era Battlefield