Topping D900 採用獨有的 32 相 DSM（離散 Sigma 調製）架構，突破了音訊保真度的界限。作為 Topping 技術實力的真正體現，這款頂級 DAC 融合了數位精度、自然流暢的音樂性和極高的靈活性，能夠充分展現所有音源的魅力。它支持高達 PCM 32bit 768kHz 和 DSD512 的高解析度取樣速率。其數模轉換部分採用 Altera Max II CPLD 和 Accusilicon 45MHz/49MHz 時鐘，確保完美同步。
此外，它還擁有眾多功能，例如支持 LDAC 的藍牙 5.1 以及可通過 Topping Tune 應用程式訪問的 10 段參數等化器。在連線性方面，Topping D900 也非常完善，配備豐富的數位輸入介面，可適應各種不同的配置。輸出包括兩個平衡式 XLR 輸出：一個線路輸出和一個前置放大器輸出，可靈活集成到您的音訊系統中。
Technical characteristics
| Specifications |
|---|
| Product type | DAC |
| DAC chip | PSRM circuit |
| Bluetooth chip | QCC5125 |
| CPLD | Altera Max II |
| Inputs | 1x USB-C
1x USB-B
2x Coaxial
2x Toslink optical
1x AES/EBU
1x I2S via HDMI
Bluetooth |
| Outputs | 1x XLR line output
1x XLR preamp output |
| Supported sample rates | PCM up to 32Bit 768kHz
DSD up to DSD512 |
| Bluetooth version | 5.1 |
| Supported Bluetooth codecs | SBC, AAC, aptX, aptX-HD, aptX-Adaptive and LDAC |
| In/Out trigger | |
| DAC + Preamplifier function | |
| 10-band equalization | |
| Color display | |
| Interface | Aurora UI |
| XLR line output specifications |
|---|
| THD+N @ A-WT | < 0.000055% @ 1kHz |
| THD @ No-wt 45kBw | < 0.00015% @ 20-20kHz |
| SNR @ A-WT | 131dB @ 1kHz |
| Dynamic range @ A-WT | 131dB @ 1kHz |
| Frequency response | 20Hz-20kHz (+/-0.3dB)
20Hz-40kHz (+/-1.0dB) |
| Output level | 4.2Vrms @ 0dBFS (4V mode)
5.2Vrms @ 0dBFS (5V mode) |
| Noise @ A-WT | < 1.5uVrms |
| Channel crosstalk | -147dB @ 1kHz |
| Channel balance | 0.3dB |
| Output impedance | 100 ohms |
| XLR preamp output specifications |
|---|
| THD+N @ A-WT | < 0.000055% @ 1kHz |
| THD @ No-wt 45kBw | < 0.00015% @ 20-20kHz |
| SNR @ A-WT | 131dB @ 1kHz |
| Dynamic range @ A-WT | 131dB @ 1kHz |
| Frequency response | 20Hz-20kHz (+/-0.3dB)
20Hz-40kHz (+/-0.1dB) |
| Output level | 10.5Vrms @ 0dBFS (4V mode)
13Vrms @ 0dBFS (5V mode) |
| Noise @ A-WT | < 1.6Vrms |
Channel crosstalk | -147dB @ 1kHz |
| Channel balance | 0.3dB |
| Output impedance | 100 ohm |
| General |
|---|
| Color | Silver |
| Package | 1x Topping D900
1x Bluetooth remote control
1x Bluetooth antenna
1x Power cord |
Topping A900是一款高端耳機放大器和前置放大器，集功率、性能和設計於一體。它採用拓平獨有的對稱放大架構，能夠輸出強勁的功率，足以驅動絕大多數音訊耳機。此外，除了卓越的性能參數外，A900還擁有極其豐富的介面，能夠滿足各種不同的使用需求。
唐古拉獨有的放大架構採用全新的三級回饋電路（專利技術），有效降低電路雜訊和高頻失真，將動態範圍提升至驚人的 151dB，全頻段總諧波失真 (THD，90kBw) 低至 0.00003%。此外，這項新技術還能有效降低電路發熱量，提高可靠性，延長設備使用壽命。
三個唐古拉模組構成平衡的六聲道架構，確保從音源到輸出的平衡信號傳輸。這款耳機放大器在 16Ω 負載下可提供高達 2x 22000mW 的功率輸出。
A900 可讓您輕鬆選擇多種顯示模式，例如播放資訊、FFT 頻譜或 Vu 計。該設備還提供六種背景顏色，因此您可以根據自己的審美偏好調整介面。
Technical characteristics
| Specifications |
|---|
| Product type | Headphone amplifier
Preamplifier |
| Inputs | 3x combo XLR (balanced) / Jack 6.35mm (single-ended) |
| Outputs | 2x Combo XLR (balanced) / Jack 6.35mm (single-ended) combo headphone output
2x Balanced XLR 4 pins headphone output
2x Balanced Jack 4.4mm headphone output
1x Balanced XLR pre-out |
| Headphone amplifier measurements |
|---|
| | Balanced input / Single-ended output | Balanced input / Balanced output |
| THD+N @ 1kHz, A-wt | < 0.00006% @ 500mW, 32Ω
< 0.000055% @ 80mW, 300Ω | < 0.00006% @ 500mW, 32Ω
< 0.000055% @ 80mW, 300Ω |
| THD+N @ 20-20kHz, 90kBW | < 0.00006% @ 500mW, 32Ω
< 0.00005% @ 80mW, 300Ω | < 0.00004% @ 500mW, 32Ω
< 0.00003% @ 80mW, 300Ω |
| SNR @ Max out, 1kHz, A-wt | 143dB | 151dB |
| Dynamic range @ 1kHz, A-wt | 143dB | 151dB |
| Frequency response | 20Hz-40kHz (±0.05dB)
10Hz-200kHz (±0.1dB) | 20Hz-40kHz (±0.05dB)
10Hz-200kHz (±0.1dB) |
| Output level | 30Vpp @ G=L
30Vpp @ G=M
30Vpp @ G=H | 60Vpp @ G=L
60Vpp @ G=M
60Vpp @ G=H |
| Audio Precision noise level @ A-wt | < 0.7µVrms @ G=L
< 0.9µVrms @ G=M
< 1.5µVrms @ G=H | < 0.7µVrms @ G=L
< 1.2µVrms @ G=M
< 2.5µVrms @ G=H |
| Effective noise level @ A-wt | < 0.3µVrms @ G=L
< 0.7µVrms @ G=M
< 1.4µVrms @ G=H | < 0.3µVrms @ G=L
< 1.0µVrms @ G=M
< 2.3µVrms @ G=H |
| Crosstalk @ A-wt | -105dB | -153dB |
| Input sensitivity | 22.0Vrms @ G=L
7.0Vrms @ G=M
2.1Vrms @ G=H | 22.0Vrms @ G=L
7.0Vrms @ G=M
2.1Vrms @ G=H |
| Gain | -6.1dB @ G=L
+4.3dB @ G=M
+13.8dB @ G=H | -0.1dB @ G=L
+10.3dB @ G=M
+19.8dB @ G=H |
| Output impedance | < 0.1Ω | < 0.1Ω |
| Output power | 2x 6000mW @ 16Ω, THD+N <0.1%
2x 3000mW @ 32Ω, THD+N <0.1%
2x 1550mW @ 64Ω, THD+N <0.1%
2x 660mW @ 150Ω, THD+N <0.1%
2x 330mW @ 300Ω, THD+N <0.1%
2x 165mW @ 600Ω, THD+N <0.1% | 2x 22000mW @ 16Ω, THD+N <0.1%
2x 14000mW @ 32Ω, THD+N <0.1%
2x 7000mW @ 64Ω, THD+N <0.1%
2x 3000mW @ 150Ω, THD+N <0.1%
2x 1500mW @ 300Ω, THD+N <0.1%
2x 750mW @ 600Ω, THD+N <0.1% |
| Adapter impedance | > 8Ω |
| Preamplifier measurements |
|---|
| THD+N @ 1kHz, A-wt | < 0.000055% |
| THD+N @ 1kHz, A-wt | < 0.00003% |
| SNR @ Max out, 1kHz, A-wt | 151dB |
| Dynamic range @ 1kHz, A-wt | 151dB |
| Frequency response | 20Hz-40kHz (±0.05dB)
20Hz-200kHz (±0.1dB) |
| Output level | 60Vpp @ G=L
60Vpp @ G=M
60Vpp @ G=H |
| Audio Precision noise level @ A-wt | < 0.7µVrms @ G=L
< 1.2µVrms @ G=M
< 2.5µVrms @ G=H |
| Effective noise level @ A-wt | < 0.3µVrms @ G=L
< 1.0µVrms @ G=M
< 2.3µVrms @ G=H |
| Crosstalk | -153dB |
| Input sensitivity | 22.0Vrms @ G=L
7.0Vrms @ G=M
2.1Vrms @ G=H |
| Gain | -0.1dB @ G=L
+10.3dB @ G=M
+19.8dB @ G=H |
| Output impedance | 100Ω |
| General |
|---|
| Color | Silver |
| Dimensions (W x D x H) | 33 x 20 x 5.7cm |
| Package | 1x Topping A900
1x Remote control
1x Power cable |
