Product: Theta DS Pro basic DAC Digital Signal Processor Functional Notes:
condition of this item is excellent, fully tested and no issues found.
Looks great with few Minor Scratches
Notes: Very Rare.
The DSPro Basic is rather simple, with the front panel home to just two toggle switches and two LEDs. One switch selects between CD (44.1kHz) and DAT (48kHz) inputs, while the other inverts absolute polarity. The left LED indicates the unit is locked onto the incoming data, while the right indicates power is applied. The rear panel contains the analog outputs, two digital inputs (CD and DAT), and a digital tape-out loop for driving a DAT machine input, all on gold-plated RCA jacks. An IEC AC power-cord jack finishes off the rear panel. No power on/off switch is provided, suggesting that the DSPro Basic should be left on continuously. Construction is a bent-steel chassis with a ¼"-thick front panel. The top panel is screwed into pem-nuts in the chassis with hex-head bolts, an improvement over sheet-metal screws into chassis holes. Overall, I found the DSPro Basic's appearance attractive and its fit and finish quite good.
All the DSPro Basic's electronics are carried on a single printed circuit board, separated into digital and analog sections. The unit has two separate power supplies, one for the digital section and one for analog circuitry. The digital supply consists of a transformer, rectifier, two 4700µF filter caps, and a large heat-sunk regulator in a TO-3 package. The analog supply is more elaborate, with a similar transformer, two rectifiers, and four 2200µF filter caps. Additional analog power-supply components are located at the other end of the PCB, next to the DACs and analog output stage. Six voltage regulators are used in the analog supply, but not the typical TO-220 type (footnote 1) found in most digital processors. Instead, they are small round metal cans which, according to DSPro Basic designer Mike Moffat, offer superior sound over the less expensive and easier-to-implement TO-220s.
The digital section features the ubiquitous Yamaha YM3623B 16-bit S/PDIF decoder, along with a few chips whose markings were painted over. The Yamaha decoder extracts the clock information from the signal with an internal phase-locked loop (PLL), strips out the subcode, demultiplexes left and right audio, and sends the data to the next processing stage.
The wire carrying the digital data stream from the RCA input jack to the digital board was carefully chosen for its sonic virtues. This low-propagation delay wire was suggested by Dave Magnan, maker of the highly regarded Magnan Type V interconnects. According to Mike Moffat's listening tests, even this short (3") piece of wire carrying ones and zeros affects the processor's sound. Other design aspects of the DSPro Basic include careful attention to timing relationships and clock signals to avoid jitter, an input circuit to keep RF out, and minimizing ground-plane noise.
Service History: None
Number of Owners: 1
Tobacco Exposure: No
8x-oversampling, dual 18-bit digital signal processor. Inputs: two digital coaxial on RCA jacks. Output: 1 digital (S/PDIF) on RCA. Analog outputs: unbalanced RCA jacks. Sample rates handled: 44.1kHz, 48kHz. Frequency response: 20–20.5kHz +0, –0.1dB. S/N ratio: 104dB. THD at full output: Less than 0.001%. Output level: 3.4V RMS minimum.
Price: $1995 (1990); no longer available (2009).
19" W by 2¼" H by 14" D.
Weight: 17 lbs (shipping).
Payments: PayPal payments are preferred and we do not charge extra fees. Credit card payment is available as well without processing fees. You can also send us a check or money order, which needs to clear before shipping, or wire transfer (telegraphic transfer). If you want to do a wire transfer, please ask us for our bank information.
Pick Up or Shipping: A local pick up from our location in Englewood, NJ is preferred after a test. However, if this is to be shipped, it will be packed professionally using top-grade wraps, cushions, and heavy-duty boxes. If palletizing is needed, it will be done professionally by our experienced staff as well. Quoted fee is for shipping within the continental United States. For all other locations including Hawaii, Puerto Rico, and Alaska, please request a quote.
International Buyers: We welcome buyers from around the world. Please wait for an accurate shipping cost. All fees including duty in your country are your responsibility. You are also responsible for voltage conversion if needed.
Have Gear to Sell or Trade?: If you have gear to sell, trade, or consign, please send us
an email to [email protected] or a text message to 1-201-674-7895
with the following information. We will get back to you within 24 hours.
Model # :
City and State :
Email address and telephone number (if available) :
Pictures (if available) :
AUDIO BUYERS, INC.
Welcome to Audio Buyers Inc. Located in Englewood, NJ, we specialize in buying, selling, trade-In, and consignment of Vintage Audio Equipment and High-End Stereo and Home Theater Amplifier and Speakers. We also deal with Turn Tables, CD Players, DACs, Tuners, Inter-Connects and Cables, LPs and CDs, etc.
Please review our feedbacks and buy with confidence!!AUDIO BUYERS, INC.
Your satisfaction is our priority. Please let us know if you notice something we can improve.
If you have a question or request, please do not hesitate to send us an email at [email protected] or a text message to 1-201-674-7895.
Thank for your business.