The SY-DAPx002 is a DIY-able desktop amplifier designed for high-quality, high-fidelity class D audio. It is built around the Texas Instruments PurePath™ Ultra-HD TPA32xx series audio amplifier base, offering efficient low-noise Quasi-Resonant power supply, Sigma DSP, and Bluetooth 5.0 wireless audio streaming. This custom-designed device features new functionalities and committable performance, making it a unique design.
Key Features:
- High Performance Audio: Utilizes Texas Instruments TPA32xx PurePath™ Ultra-HD Analog-input high-performance Class-D power amplifier for true premium sound quality.
- Efficiency: Achieves up to 90% efficiency, reducing power dissipation and thermal output.
- Digital Audio Processing: Features 28-/56-bit, 50 MIPS digital audio processor (ADAU1701) with built-in ADCs and DACs for full integrated audio path processing and control.
- Powerful Signal Processing: Includes equalization, crossover, bass enhancement, multiband dynamics processing, delay, compensation, speaker compensation, and stereo image widening.
- Volume Control: Full digital volume control for best precise linear control and lowest distortion.
- Multi-Function Key: Built-in multi-function key for all UI control like volume and BT connection and playing.
- LED Indicators: Built-in 15 Segment LEDs Ring for volume indicating and other UI functions.
- Bluetooth Connectivity: Incorporates Qualcomm Bluetooth 5.0 (QCC3008) with aptX, providing better sound quality and longer transmission distance.
- Audio Grade Components: A large number of audio grade components are used to achieve best sound experience.
- Optimized Layout: State-of-art, fully differential audio path layout design for lowest noise cancellation and distortion to get the highest performance on all sections.
- Protection Circuitry: Full feature protection circuit built-in, including over temp, overcurrent, and Pop noise suppression.
- High Quality Power Supply: Integrated power supply designed for highest audio experience.
Technical Specifications:
- Audio Inputs: RCA, Bluetooth (5.0 aptX). RCA is the default input, with auto switch to Bluetooth input when audio is active.
- Speaker Impedance: 4ohm (Minimum) ~ 8ohm (recommended). Maximum Peak Power depends on power supply capability in varied system.
- Input: RCA: 1Vrms (adjustable).
- Sensitivity: Bluetooth: 0dBFS.
- Output Power:
- SY-DAP1002: 50Wx2 (8Ω)
- SY-DAP2002: 100Wx2 (8Ω)
- Power:
- SY-DAP1002: 20W (Normal Volume)
- SY-DAP2002: 40W (Normal Volume)
- Consumption:
- SY-DAP1002: 40W (Normal Volume)
- SY-DAP2002: 40W (Normal Volume)
- Auto Standby: Auto Entry Standby Mode When No Audio or Act unit after 20 Minutes. User can disable by Update DSP F/W.
- Feature: SY-DAP1002 Rev1.0 version set to 10 Minutes.
- AC Input:
- SY-DAP1002: Universal AC 100V~240V; 50Hz~60Hz
- SY-DAP2002: AC 100V or 240V; 50Hz~60Hz
- Size:
- SY-DAP1002: 170mm*138mm*43mm (L*W*H)
- SY-DAP2002: 193mm*138mm*43mm (L*W*H)
- Net Weight:
- SY-DAP1002: 0.9Kg
- SY-DAP2002: 1.2Kg
- Case and Color: Aluminum Chassis, Matte Black.
User Interface and Instructions:
The front panel features a multi-function key (1), volume LED ring (2), power LED (3), speaker connector (5), Bluetooth antenna (6), and AC input (7). The back panel includes RCA analog input (4) and speaker output.
- Multi-function Key: All UI control is implemented by a single key combined with the potentiometer for volume.
- Power On and Off:
- Short press will turn unit ON from standby mode.
- Press and hold for 2 seconds will turn unit OFF from working mode.
- Volume control:
- Volume + : Clockwise.
- Volume - : Anticlockwise.
- Bluetooth Pairing:
- Continues fast press 2 times and hold 2 seconds at second press until the middle LED flickering indicates entry into Bluetooth pairing mode. Search for "SY-DAP1002" or "SY-DAP2002".
- Continues fast press 2 times and hold 5 seconds at second press until all LED flickering to clear pairing list in case you used many devices and fail on connection.
- Play&Stop: Short press.
- Next song: Fast short press 2 times.
- Previous song: Fast short press 3 times.
- RCA Input: A standard stereo RCA cable can be used for any analog audio signal input. The source device from DAC, media player with high performance and low noise will better for getting good audio quality.
- Speaker Output: Typically, a banana female connector can be used to easily connect to your passive speaker system. Pay attention to polarity; it must follow the mark on the unit to avoid any effect on sound quality.
- Bluetooth Antenna: An external antenna is provided and should be used for best BT performance.
- AC Input: Use your local country C7 power core for AC supply, and note that we don't provide this cable.
DIY Instructions:
The SY-DAPx002 is designed for DIY enthusiasts, offering more fun and enjoyment. Some special user case integration, such as modifying the DIY-able design, is possible, but users must satisfy potential changing chance. Please note that all DIY changes have potential RISK to damage the product and you will own the responsibility for all modification, and be sure that you or the modifier have good experience to make a good and successful change.
- DSP EQ Tuning:
- A traditional DIY experience involves changing most of the analog audio path like input output buffer, OP-AMP type, etc. This device offers another way to make things magical and powerful: DSP processing. You can call EQ tuning, which is implemented on Analog Device's SigmaStudio software.
- A User EQ block is reserved for DIY, allowing tuning and further modification. This block and others must be locked to protect unnecessary function lose.
- There are 3 options inside the User EQ block: default setting (bypass without any EQ), Param EQ, or Auto EQ.
- Reference Material:
- https://wiki.analog.com/resources/tools-software/sigmastudio/toolbox/adialgorithms/automaticspeakereq
- https://ez.analog.com/dsp/sigmadsp/f/q-a/64304/adau1701-sigmastudio-rew-auto-eq
- A dedicated download tool: EVAL-ADUSB2EBZ (from analog device) or USBi/Free USBi (low cost) is needed for SigmaStudio online design and F/W burn into EEPROM. There is an onboard USBi connector for online debug and programming. Only SCL, SDA and GND signals are available, and no power supply output and the rest PINs are connected.
- Audio OP-Amp Swapping:
- A traditional DIY way is to replace different kinds of op-amp to have all kinds of sound experience. Based on this consideration, you can change the op-amp into this product design by using a typical DIP-8 footprint. Users can replace with same package size and it is easy to swap them anytime.
- Please note that we use high-end one OPA1602 SMT package on SY-DAP1002 Rev1.0 version.
- Change Points: Refer to figure 1&2 blue area (U1; U2).
- Audio Cap Swapping:
- Use audio grade capacitor for audio coupling path to get best audio quality. Users can replace some other type capacitor to get a good taste for themselves, ensuring same rating material (e.g., 10uF/16V) and polarity is correct.
- Change Points: Refer to figure 1&2 yellow area (SY-DAP1002: C1; C6; C93; C86; C70; C69; C9; C12; C17; C20 and SY-DAP2002: C1; C6; C69; C70; C86; C93; C9; C12; C17; C20).
- LC filter Film Cap Swapping:
- Users can change the film capacitor on class D demodulation output stage to have better matching on their system based on transducer impedances. Please note that we use TDK B32529 series MKT film cap. Be sure to use same or higher quality capacitor, otherwise the performance will degrade.
- Change Points: Refer to figure 1&2 brown area (SY-DAP1002: C63; C73; C80; C89 and SY-DAP2002: C63; C73; C83; C90).
- Analog Input Sensitivity Adjusting:
- By default, the design setting on this product, compatible with most of the DAC device including low level output from a cell phone, takes 1Vrms input level for a sensitive input to get rate output power. In some cases, users keep using other high level output DAC devices, and the output level is hard to adjust at some point. In this case, by changing a smaller setting in circuit, it will be a good implementation for using higher level input device.
- Changing 2 resistors (red marked) close to DSP(U3) can adjust input sensitive level.
- R = (Rms Input Voltage) × 10KΩ - 2KΩ
- 1V: 8.2 (default) - 1%; 0603 size
- 2V: 18 - 1%; 0603 size
- 3V: 28 - 1%; 0603 size
Q&A:
- TPA3250 vs TPA3255: TPA3250 is better than TPA3255 regarding THD, Noise and Efficiency. TPA3250 design is smaller and more compacted, the advance of TPA3255 is only can output higher power, but has higher thermal lose also. They are the same level of audio quality point of view.
- Why use DSP in this product? In the past, many people used to change or upgrade the OP-Amp or analog circuit, which limited to achieve a good implementation on a whole audio system, with a powerful DSP you can make many things more wonderful in digital world, for example you can design your own custom EQ like High/low pass, crossover, bass, treble, loudness control, etc. Just leave it as is if you don't want touch DSP (flat EQ).
- How can I access the DSP for design my own EQ? There is a USBi download connector that giving user directly connect to ADAU1701 DSP, all you need to do is make your individual design and then download to on board EEPROM, please note that MUST use our SigmaStudio design template (please get from our website) for further EQ design and modification.
- How is the OP-AMP performance, do we need change it? The OP-AMP is OPA1602 sound plus series and performance is very good, but change OP-AMP always fun of DIY. Only Rev1.0 available and Rev1.1 change to other common part like NE5532.
- What is the voltage on amplifier power rail? TPA3250 - 30V; TPA3255 - 37V, 44V Max.
- What DIY stuff can be done in this product? We put many efforts to achieve this high quality customized design, for detail DIY please refer to previous sections. Please note that any other change is high risk damage the whole product and result in invalid warranty.
- What is cooling way? For SY-DAP1002, as it is lower power output and power dissipations, use internal bottom side conductive to PCB surface and plus external heatsink. For SY-DAP2002, as higher output power and power dissipations, beside using a larger heatsink, an active cooling way by using a FAN to have fully thermal management. Please note that there is a FAN noise (>20dB) when is it active trigger by sensor.
Maintenance Features:
- General Care: Install this unit in a well ventilated, cool, dry, clean place away from direct sunlight, heat sources, vibration, dust, moisture, or cold.
- Placement: On the top of this unit, do NOT place:
- Other components, as they may cause damage or discoloration on the surface of this unit.
- Combustible (i.e. candles), as they may cause fire, damage to this unit, or personal injury.
- Containers with liquid in them, as they may fall and the liquid may cause electrical shock to the user or damage to this unit.
- Covering: Do not cover this unit with a newspaper, tablecloth, curtain, etc. in order not to obstruct heat radiation. If the temperature inside this unit rises, it may cause fire, damage to this unit, or personal injury.
- Voltage: Use the voltage specified on this unit ONLY. Using this unit with a higher voltage than specified is dangerous and may cause fire, damage to this unit, or personal injury. 3e audio will not be held responsible for any damage resulting from the use of this unit with a voltage other than that specified.
- Modification/Repair: Do not attempt to modify or fix this unit by yourself. Contact qualified 3e audio service personnel when any service is needed. The cabinet should never be opened for any reason.
- Power Cable: When not planning to use this unit for long periods of time (i.e. when going on vacation), disconnect the power cable from the AC wall outlet.
- Lightning Storms: For added protection for this product during a lightning storm, or when it is left unattended and unused for long periods of time, unplug it from the wall outlet. This will prevent damage to the product due to lightning and power-line surges.
- DIY Modification: For any DIY modification, please be sure you follow our guide line and be sure not modify any other sections that don't list here, be aware that any incorrect modification has RISK result in damage unit, changes or lose in function, the switching mode power supply section is not allow to any modification!!!
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