Zebronics ATC1 USB Type A to Type C Converter

Excellent

Been using it for a month. No issues

Joshwin SV · review on Amazon

Worth it.

Good product. Worth it.l

Rituparno · review on Amazon

Worth of Money..

✨ ⭐ 🌟 💫 ZEITEL SOUND CARD — KTMICRO USB DAC 💫 🌟 ⭐ ✨🎧 FULL MASTER AMAZON REVIEW — UNCOMPRESSED EDITIONVERSION: MASTER REVIEW EDITIONDATE: 28 AUGUST 2026PRODUCT: Zeitel USB Sound Card / KTMicro USB DACUSB AUDIO: KT USB AudioVERIFIED VID: 0x31B2VERIFIED PID: 0x1002MAXIMUM NATIVE PCM: 24-bit / 96 kHzOUTPUT: 3.5 mm Headphone TerminalARCHITECTURE: USB 2.0 · Full Speed · UAC1 · Stereo PCM━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━🎧 ① PRODUCT OVERVIEW│ Zeitel Sound Card — KTMicro USB DAC│ This is a compact USB audio device designed to function as an external digital-to-analog audio interface for headphones and IEMs.│ Based on the supplied USB descriptor analysis, the device identifies itself as KTMicro — KT USB Audio, with:│ Vendor ID: 0x31B2│ Product ID: 0x1002│ USB: 2.0 Full Speed│ Audio Class: UAC1│ Maximum native PCM: 24-bit / 96 kHz│ Channels: Stereo│ Output terminal: Headphones (0x0302)│ The most important point is that the device's 24/96 capability is established by its USB audio descriptors, while its exact internal DAC and amplifier components are not identified by those descriptors.━━━ ✦ ━━━🔌 ② DEVICE IDENTITY — VERIFIEDFIELD VERIFIED VALUEManufacturer KTMicroVendor ID 0x31B2Product ID 0x1002Product KT USB AudioSerial 2020-02-20-0000-0000-0000-USB Version USB 2.0Device Class 0x00 — Interface Class DefinedMaximum Packet Size 64 BytesbcdDevice 1.00USB Speed Full SpeedPower 100 mA · Bus PoweredRemote Wakeup Supported│ The USB identity therefore gives us considerably more technical information than a generic product description.━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━🔬 ③ COMPLETE USB DEVICE DESCRIPTOR│ bLength: 0x12│ bDescriptorType: 0x01│ bcdUSB: 0x0200│ bDeviceClass: 0x00│ bDeviceSubClass: 0x00│ bDeviceProtocol: 0x00│ bMaxPacketSize0: 0x40│ idVendor: 0x31B2│ idProduct: 0x1002│ bcdDevice: 0x0100│ iManufacturer: 0x01│ iProduct: 0x02│ iSerialNumber: 0x03│ bNumConfigurations: 0x01DEVICE STRINGS│ Manufacturer: KTMicro│ Product: KT USB Audio│ Serial: 2020-02-20-0000-0000-0000-━━━ ✦ ━━━🎛️ ④ USB INTERFACE ARCHITECTURE│ The device exposes 3 USB interfaces.① INTERFACE 0 — AUDIO CONTROL│ Contains:│ • Input Terminal│ • Mixer Unit│ • Feature Unit│ • Output Terminal② INTERFACE 1 — AUDIO STREAMING│ Provides the actual PCM audio-streaming interface with alternate settings for supported formats.③ INTERFACE 2 — HID│ Provides a USB Human Interface Device interface for hardware-control functionality.━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━🎧 ⑤ HEADPHONE OUTPUT — IMPORTANT│ Terminal ID: 0x08│ Terminal Type: 0x0302│ Source ID: 0x07│ 0x0302 specifically corresponds to a Headphones terminal.│ This is technically different from:│ 0x0301 = Line Out✅ VERIFIED│ Dedicated headphone terminal: CONFIRMED⚠️ IMPORTANT LIMITATION│ The USB descriptor does not reveal:│ • Exact headphone amplifier IC│ • Output power│ • Output impedance│ • Internal amplifier topology│ • Analog circuit design│ Therefore, the correct conclusion is:✅ Headphone output: VERIFIED⚠️ Exact amplifier architecture: UNKNOWN━━━ ✦ ━━━📊 ⑥ NATIVE PCM CAPABILITY🎵 ALTERNATE SETTING 1 — 16-BIT PCM│ Channels: 2 — Stereo│ Subframe: 2 bytes│ Resolution: 16-bit│ Sample Rates: 48 kHz · 96 kHz│ Maximum Packet: 0x0180 = 384 bytes🎵 ALTERNATE SETTING 2 — 24-BIT PCM│ Channels: 2 — Stereo│ Subframe: 3 bytes│ Resolution: 24-bit│ Sample Rates: 48 kHz · 96 kHz│ Maximum Packet: 0x0240 = 576 bytes⭐ NATIVE FORMATS16/48 · 16/96 · 24/48 · 24/96│ Therefore, the supplied USB analysis establishes native stereo PCM support up to 24-bit / 96 kHz.━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━📈 ⑦ STEREO PCM DATA RATESFORMAT CALCULATION DATA RATE16/48 48,000 × 2 × 2 192,000 bytes/s16/96 96,000 × 2 × 2 384,000 bytes/s24/48 48,000 × 2 × 3 288,000 bytes/s24/96 96,000 × 2 × 3 576,000 bytes/sPCM BITRATESFORMAT PCM BITRATE16/48 1,536 kbps16/96 3,072 kbps24/48 2,304 kbps24/96 4,608 kbps│ ⚠️ These numbers represent decoded stereo PCM data rates, not compressed streaming-download bitrates.━━━ ✦ ━━━🔬 ⑧ AUDIO STREAMING DESCRIPTOR│ Interface: 1│ Audio Class: 0x01│ Streaming Subclass: 0x02│ PCM Format: 0x0001│ Channels: 2│ Subframe: 3 bytes│ Resolution: 24-bitDISCRETE FREQUENCIES│ 0x00BB80 = 48,000 Hz│ 0x017700 = 96,000 HzENDPOINT│ Endpoint: 0x01 OUT│ Transfer: Isochronous│ Maximum Packet: 0x0240 = 576 bytes│ Interval: 0x0001│ This is consistent with a USB audio streaming endpoint carrying stereo PCM data.━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━🎚️ ⑨ FEATURE UNIT — VOLUME & MUTE│ Unit ID: 0x07│ Source: 0x06│ Control Size: 0x01CONTROLS│ Master: Mute│ Channel 0: Volume│ Channel 1: Volume✅ RESULTMaster mute + independent left/right volume control━━━ ✦ ━━━🎛️ ⑩ MIXER UNIT│ Unit ID: 0x06│ Input Pins: 2│ Sources: 0x05 + 0x05│ Channels: 2│ Channel Configuration: 0x0003FUNCTION│ Provides 2-channel stereo mixing within the USB audio architecture.━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━🎮 ⑪ HID HARDWARE CONTROL│ Interface: 2│ HID Class: 0x03│ HID Version: 0x0110│ bCountryCode: 0x21│ Report Descriptor Length: 0x0048│ Endpoints: 2IN ENDPOINT│ 0x82 · Interrupt · 0x0010 = 16 bytes · Interval 0x01OUT ENDPOINT│ 0x02 · Interrupt · 0x0010 = 16 bytesPOSSIBLE HARDWARE FUNCTIONS│ • Hardware volume buttons│ • Play/Pause│ • Mute│ ⚠️ The HID interface is confirmed, but the USB descriptor alone does not establish exactly which physical controls are implemented on the particular hardware.━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━🔌 ⑫ COMPLETE ENDPOINT SUMMARYENDPOINT DIRECTION TYPE PACKET0x82 IN Interrupt 16 B0x02 OUT Interrupt 16 B0x01 OUT Isochronous 576 B━━━ ✦ ━━━🎧 ⑬ DAC VS AMPLIFIER🔬 DAC│ The DAC performs:Digital PCM → Analog Audio🔊 AMPLIFIER│ The headphone output stage provides the electrical drive required by the connected headphones or IEMs.🔌 ZEITEL SIGNAL PATHUSB → USB Audio → PCM → Clocking → DAC → Analog → Headphone Output Stage → 3.5 mm Headphones│ This distinction is important.│ A USB descriptor can establish the digital audio capability and terminal type, but it cannot identify every component of the analog signal chain.━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━⚠️ ⑭ AMPLIFIER SPECIFICATIONS — ESTIMATED ONLY│ The following values should NOT be interpreted as official specifications:│ Estimated output power: approximately 20–50 mW @ 32 Ω│ Estimated output impedance: likely <10 Ω│ Typical expected load: approximately 16–80 Ω│ These are engineering estimates rather than manufacturer-published or USB-descriptor-confirmed measurements.⚠️ THEREFOREExact output power: UNKNOWNExact output impedance: UNKNOWNExact amplifier IC: UNKNOWN━━━ ✦ ━━━🎧 ⑮ HEADPHONE / IEM COMPATIBILITYLOAD EXPECTED SUITABILITY16–32 Ω IEM ✅ Excellent suitability32–50 Ω portable headphones ✅ Good80–300 Ω headphones ⚠️ May lack volume/dynamicsPlanar magnetic ⚠️ Highly dependent on sensitivity│ These are practical engineering expectations, not laboratory measurements.│ Actual performance depends on headphone sensitivity, impedance characteristics, desired listening level and the unknown analog output-stage specifications.━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━📱 ⑯ CONNECTION GUIDEDEVICE CONNECTION RESULTUSB-C smartphone USB-C → USB-A OTG → Zeitel ✅Micro-USB smartphone Micro-USB → USB-A OTG → Zeitel ✅Laptop USB-A Direct USB-A ✅Desktop USB-A Direct USB-A ✅Laptop USB-C USB-C → USB-A adapter/connection ⚠️ May be requiredPS4/PS5 Direct USB-A ⚠️ Device/software dependent📌 SMARTPHONE REQUIREMENTUSB OTG support is required.│ For smartphones, a good-quality OTG adapter is recommended for reliable connection and power delivery.━━━ ✦ ━━━🔬 ⑰ VERIFIED VS UNKNOWN✅ VERIFIED BY USB DEVICE ANALYSIS│ KTMicro│ VID 0x31B2│ PID 0x1002│ KT USB Audio│ USB 2.0│ USB Full Speed│ UAC1│ 100 mA bus-powered operation│ Remote Wakeup│ Native 16/48│ Native 16/96│ Native 24/48│ Native 24/96│ Stereo PCM│ Headphone terminal 0x0302│ Mixer unit│ Volume controls│ Mute control│ HID interface│ Isochronous audio endpoint❌ UNKNOWN / NOT ESTABLISHED│ Exact KTMicro IC model│ Exact DAC silicon│ Detailed DAC architecture│ SNR│ THD+N│ Exact output impedance│ Exact output power│ Exact amplifier IC│ Exact amplifier topology│ Internal analog circuitry│ Frequency-response measurements│ Channel-separation measurements🔬 ENGINEERING PRINCIPLEA USB descriptor establishes what the device advertises digitally; it does not, by itself, establish complete analog performance.━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━⚖️ ⑱ 24/96 VS 24/192FORMAT NYQUIST LIMIT HUMAN HEARING REFERENCE24/96 48 kHz ~20 kHz24/192 96 kHz ~20 kHz🎵 24/96│ 96 kHz sampling frequency│ 48 kHz theoretical Nyquist limit│ Wide ultrasonic bandwidth│ Broad filter-transition region above conventional audible frequencies🎵 24/192│ 192 kHz sampling frequency│ 96 kHz theoretical Nyquist limit│ Greater ultrasonic bandwidth│ Even wider filter-transition region❌ 24/192 DOES NOT AUTOMATICALLY PROVIDE│ More bass│ More warmth│ More loudness│ More weight│ Twice the audible detail│ Greater bit depth│ Greater dynamic range━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━🍎 ⑲ APPLE MUSIC → ZEITEL│ Suppose the source is:Apple Music — 24-bit / 192 kHz│ and the connected DAC's documented native maximum is:24-bit / 96 kHzFINAL DIGITAL PATH24/192 SOURCE → 24/96 MAXIMUM OUTPUT → 24/96 PLAYBACK│ The source being 24/192 does not force a 24/96-limited DAC to operate at 192 kHz.━━━ ✦ ━━━🎯 ⑳ PRACTICAL 24/96 CONCLUSION⭐ 24/96 IS THE PRACTICAL NATIVE HI-RES OPERATING POINT│ This does not mean 24/192 is technically meaningless.│ It means that this particular documented USB audio device has a native maximum of 24-bit / 96 kHz, and no native 24/192 operating mode has been established from the supplied USB descriptors.━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━📊 ㉑ BIT DEPTH VS SAMPLE RATE VS BITRATEBIT DEPTH│ Determines the digital amplitude-resolution framework and theoretical dynamic-range capability.SAMPLE RATE│ Determines how frequently the waveform is sampled and therefore establishes the theoretical Nyquist limit.BITRATE│ Describes how much digital data is transmitted per unit of time.EXAMPLES│ 32-bit / 44.1 kHz → 32-bit depth → 22.05 kHz Nyquist limit│ 24-bit / 96 kHz → 24-bit depth → 48 kHz Nyquist limit│ 24-bit / 192 kHz → 24-bit depth → 96 kHz Nyquist limit⚠️ CORE RULEBIT DEPTH ≠ BITRATE ≠ SAMPLE RATE━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━📡 ㉒ STREAMING & CODECSPLATFORM FORMATS🍎 Apple Music AAC · ALAC Lossless · Hi-Res ALAC🟠 Amazon Music AAC · FLAC Lossless · Hi-Res FLAC🟢 Spotify Ogg · AAC · FLAC▶️ YouTube AAC-LC · Opus🔒 LOSSLESS PRINCIPLEFLAC and ALAC are both lossless audio codecs.│ Lossless encoding allows the decoded PCM to reproduce the encoded source samples exactly.━━━ ✦ ━━━📈 ㉓ REFERENCE DATA RATESFORMAT APPROX. DATA RATE320 kbps 40 kB/s256 kbps 32 kB/s24/96 PCM 576 kB/s24/192 PCM 1,152 kB/s│ ⚠️ The PCM figures represent decoded stereo PCM data rates, not necessarily the amount of data downloaded from a streaming service.━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━📶 ㉔ BLUETOOTH REALITYWIRED 24/96 PCM24 × 96,000 × 2 = 4,608,000 bits/s= 4,608 kbps = 576 kB/sLDACMaximum nominal transmission mode: 990 kbpsRAW-RATE COMPARISON4,608 − 990 = 3,618 kbps│ Therefore, raw 24/96 stereo PCM requires dramatically more data throughput than a 990-kbps Bluetooth transmission link.│ However, bitrate alone does not directly determine perceived quality because Bluetooth codecs use lossy psychoacoustic compression.⚠️ IMPORTANTLDAC: LossyLHDC: LossyaptX family: Lossy│ Bluetooth transmission is therefore not equivalent to carrying raw 24/96 PCM over USB.━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━🧠 ㉕ COMPLETE SIGNAL PRINCIPLESOURCE QUALITY → MASTERING → CODEC → SAMPLE RATE → BIT DEPTH → DSP → DAC IMPLEMENTATION → ANALOG OUTPUT STAGE → HEADPHONES/IEMs → LISTENING ENVIRONMENT│ Every stage contributes to the final listening experience.│ The DAC is therefore one critical component of the complete playback chain, not the sole determinant of sound quality.━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━🏆 ㉖ AMAZON REVIEW VERDICTCATEGORY ASSESSMENTUSB Audio Architecture ⭐⭐⭐⭐⭐Native 24/96 Capability ⭐⭐⭐⭐⭐Digital Format Compliance ⭐⭐⭐⭐⭐Headphone Output Identification ⭐⭐⭐⭐⭐Practical Hi-Res Capability ⭐⭐⭐⭐⭐Engineering Transparency ⭐⭐⭐⭐⭐*Measured Analog Performance ⭐⭐⭐⭐*⭐ OVERALL ARCHIVE ASSESSMENT4.7/5 — HIGHLY RECOMMENDED│ The analog-performance assessment is an archive-level technical judgment rather than a laboratory measurement because SNR, THD+N, exact output impedance and exact output power are not established by the supplied USB descriptors.━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━✅ ㉗ ZEITEL — DOCUMENTED STRENGTHS│ ✅ Native 24-bit / 96 kHz│ ✅ Verified USB descriptors│ ✅ KTMicro USB Audio identification│ ✅ USB 2.0 Full Speed│ ✅ UAC1 architecture│ ✅ 100 mA bus-powered operation│ ✅ Remote Wakeup│ ✅ Stereo PCM│ ✅ Dedicated headphone terminal│ ✅ Mixer unit│ ✅ Volume/Mute controls│ ✅ HID interface│ ✅ PC USB Audio compatibility│ ✅ Android/OTG compatibility│ ✅ Plug-and-play USB Audio architecture│ ✅ No proprietary audio driver requirement indicated by UAC1 architecture│ ✅ 24/96 maximum native PCM capability━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━⚠️ ㉘ ZEITEL — DOCUMENTED LIMITATIONS│ ❌ No published SNR measurement in supplied data│ ❌ No published THD+N measurement│ ❌ Exact DAC IC model unknown│ ❌ Exact amplifier IC/topology unknown│ ❌ Exact output impedance unknown│ ❌ Exact output power unknown│ ❌ Internal analog circuitry unknown│ ❌ No laboratory frequency-response measurement supplied│ ❌ No laboratory channel-separation measurement supplied│ ❌ UAC1 rather than UAC2│ ❌ Maximum native PCM rate is 96 kHz│ ❌ Native 24/192 operation not established│ ❌ Native 32-bit PCM capability not established━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━🔬 ㉙ FINAL SCIENTIFIC SUMMARYDIGITAL RESOLUTION24-bit remains 24-bit.│ Moving from:24/96 → 24/192│ does not increase the bit depth.SAMPLE RATE96 kHz → 48 kHz Nyquist limit192 kHz → 96 kHz Nyquist limit│ Both extend substantially beyond the conventional ~20 kHz upper boundary of human hearing.PLAYBACK CHAIN24/192 SOURCE → 24/96 OUTPUT CHAIN → 24/96 FINAL PLAYBACK│ when the connected hardware's maximum native capability is 24/96.PCM DATA24/96 stereo PCM = 4,608 kbps = 576 kB/s24/192 stereo PCM = 9,216 kbps = 1,152 kB/sBLUETOOTHLDAC 990 kbps maximum nominal mode is far below raw 24/96 PCM's 4,608-kbps data requirement because LDAC uses lossy compression.━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━🔌 ㉚ ZEITEL — FINAL CONCLUSION🏆 MY TECHNICAL VERDICT│ The Zeitel KTMicro USB Sound Card / DAC is a compact USB audio solution whose supplied USB analysis verifies a USB 2.0 Full-Speed, UAC1, stereo USB audio architecture with native PCM support up to 24-bit / 96 kHz and a dedicated headphone output terminal.│ Its digital architecture is unusually informative for a small USB sound card because the USB descriptors expose the manufacturer identity, USB audio interfaces, PCM formats, sample rates, endpoints, mixer, volume/mute controls and headphone terminal.│ At the same time, technical honesty is important:Exact DAC IC: UNKNOWNExact amplifier IC: UNKNOWNExact output power: UNKNOWNExact output impedance: UNKNOWNSNR: UNKNOWNTHD+N: UNKNOWNLaboratory analog measurements: NOT SUPPLIEDNative 24/192: NOT ESTABLISHEDNative 24/96: VERIFIED⭐ STRONGEST DEFENSIBLE CONCLUSIONVERIFIED DIGITAL CAPABILITY: 24/96VERIFIED HEADPHONE OUTPUT: YESEXACT DAC IC: UNKNOWNEXACT AMPLIFIER PERFORMANCE: UNKNOWN24/192 NATIVE PLAYBACK: NOT ESTABLISHED24/96: PRACTICAL NATIVE MAXIMUM━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━🌟 ㉛ MOST IMPORTANT PRINCIPLEThe number printed on a source file is not the entire audio experience.│ Source quality│ Mastering│ Codec│ Sample rate│ Bit depth│ DSP│ DAC implementation│ Analog output stage│ Headphones/IEMs│ Listening environment│ All contribute to what we ultimately hear.━━━ ✦ ━━━🎧🔬 ZEITEL MASTER STATEMENTThis is not a review based merely on marketing numbers.It is a technical review based on the USB audio architecture available from the device analysis.│ 24-bit remains 24-bit.│ 96 kHz is the verified native maximum.│ The headphone terminal is explicitly identified.│ KTMicro KT USB Audio is identified by USB descriptors.│ The digital architecture is documented.│ The analog limitations are honestly separated from verified facts.✨ ⭐ 🌟 💫 ZEITEL USB SOUND CARD — MASTER REVIEW COMPLETE 💫 🌟 ⭐ ✨🔌 CONNECT · 🎧 LISTEN · 🔬 ANALYZE · 📊 VERIFY · 🎛️ TUNE · 🎵 ENJOYStop chasing numbers. Start understanding the signal — and enjoy the music.

Stardust Son · review on Amazon

Zebronics ATC 1 USB type a to type c

It is not heating too much connectivity is also too good and it is not wavelength while connecting and it is very fit by both side for USB and also type c and it is value for money you should give it a try and the functions is also workingVery good dongle in low budget

Ujjwal Yadav · review on Amazon