Oracle Audio CD2500 MkIV CD Player

The Oracle Audio CD2500 MkIV is a top-loading CD player built on the same floating chassis and four-tower suspension as the CD2000 MkIII transport, with a Burr Brown PCM1792-AG DAC and four fully discrete analog modules inside. It plays discs to balanced XLR and single-ended RCA outputs, and a rear toggle turns it into a standalone DAC for a streamer or server on its S/PDIF input.

Oracle made its name with turntables, and the CD2500 MkIV carries the same thinking into digital: suspend the mechanism, clamp the disc, and keep vibration away from the part doing the reading. The MkIV adds a new DAC board built around the PCM1792, with inputs and outputs up to 24 bits and 192kHz, and analog modules that Oracle improved from earlier versions and calls the center of the player's music reproduction quality. It is one box that serves your discs and your digital library through the same converter.

"Both the CD2000 MkIII and CD2500 Mk IV have had their power supply stage totally redesigned. There is better realism, more dynamics and we are closer to a true analog-like sound than ever!"

Key Features of the Oracle CD2500 MkIV

• MVSS Included: Oracle's Micro Vibration Stabilizer System (MVSS) is part of the CD2500 MkIV
• Burr Brown PCM1792-AG DAC: 24-bit/192kHz conversion with 0.0015% total harmonic distortion
• Four Fully Discrete Analog Modules: One independent module for each of the analog signals from the PCM1792
• Balanced XLR and RCA Outputs: One pair of each, output impedance below 100 ohms
• S/PDIF Digital Input: Accepts up to 24-bit/192kHz, so a streamer or server can play through the CD2500's DAC
• S/PDIF Digital Output: RCA, 0.5V peak to peak at 75 ohms, for feeding or comparing an external DAC
• Floating Chassis on Four Towers: Each tower combines no fewer than 12 components, seven mechanical filters in all
• Philips CD PRO 2LF Drive: Decoupled on Delrin pillars that remove medium and high frequency interference
• Magnetic Disc Clamp: Magnetism plus a slight vacuum from a thick urethane washer stops disc chatter
• Redesigned Power Supply: The MkIV's power supply stage was totally redesigned; it sits in an outboard case
• Full Dome Dust Cover Option: Add Oracle's full dome clear acrylic cover when you order this listing

What Is Inside the CD2500's DAC?

A Burr Brown PCM1792-AG converter running at up to 24 bits and 192kHz, followed by four independent, fully discrete analog modules, one for each analog signal the chip produces. Oracle lists 0.0015% total harmonic distortion and 10 Hz to 50 kHz response within 0.3 dB from the RCA outputs.

Oracle is clear about where the sound comes from: the analog modules, further improved from previous versions, are at the center of the CD2500's music reproduction quality. The owner's manual shows how they are used. The balanced XLR outputs run through all four modules, while the RCA outputs use two. You can run both outputs at the same time if your system calls for it.

Can the CD2500 Work as a DAC for a Streamer?

Yes. The CD2500 MkIV has an RCA S/PDIF digital input that accepts up to 24-bit/192kHz. A toggle switch on the rear panel sets the mode: facing the player, flip it left, toward the interconnect cables, for DAC mode, and right for CD playback. It is one mode or the other, not both at once.

In DAC mode, a network streamer, music server or other digital source plays through the same PCM1792 and the same discrete analog modules your discs use. Oracle says the input plays any high resolution audio format, including 24/192 WAV native files and any PCM studio master, without compression or a drop in resolution.

Which Outputs Does the CD2500 MkIV Have?

One pair of balanced XLR outputs and one pair of single-ended RCA outputs, both with an output impedance below 100 ohms. There is also an RCA S/PDIF digital output at 0.5V peak to peak into 75 ohms, which lets the CD2500 work as a transport for an external DAC.

That digital output has a second use. Oracle's manual describes running it and the analog outputs at once, with the external converter on an auxiliary input of your preamplifier, so you can switch between the CD2500's own DAC and a stand-alone DAC and compare them directly. Oracle warns to turn the volume down first, since the gain of the two can differ a lot. Unlike the CD2000 MkIII transport, the CD2500 does not have AES/EBU or optical outputs; its digital connections are the RCA input and output.

How Does the Four-Tower Suspension Protect the Laser?

By filtering vibration in seven stages before it reaches the drive. The CD2500's floating chassis hangs on four suspension towers, each combining no fewer than 12 components: convex leveling feet, Delrin pillars for mid and higher frequencies, a conical spring for the low frequencies, spring bushings and sleeves, a sorbothane damper and felt dampers.

Each part has one job. The upper spring rubber bushing controls spring resonances, the spring adjustment sleeve calibrates the spring, the sorbothane damper is the mechanical energy trap, and the felt dampers deal with resonance inside the spring. The floating chassis itself must rigidly support the mechanism and the electronics beside it, and adds three more filters of its own: a nylon sleeve for high frequencies, Delrin drive decoupling pillars for medium and high frequencies, and a urethane energy trap. Oracle calibrates the suspension at the factory and includes a calibration tool for any fine tuning.

Why Does the CD2500 Clamp the Disc?

To stop chatter. A CD vibrates slightly at the speed the mechanism spins it, and Oracle says that wobble costs the laser focal clarity, causing distortion or misread information and pushing the error correction circuitry to work, sometimes to excess. Oracle pioneered its record clamp in 1979 and developed a CD version for the same reason.

The clamp combines magnetism with a slight vacuum created by a thick urethane washer. To play a disc, lift off the aluminum top cover, place the disc on the CD turntable, fit the clamp, replace the cover and press Disc Reset so the player reads the table of contents. Oracle says the top cover significantly improves performance, because the darker environment helps the laser read the spinning disc more accurately. Keep the urethane clean with the included Brilliance cleaner or isopropyl alcohol.

CD2500 MkIV or CD2000 MkIII?

They share the floating chassis, four-tower suspension, Philips CD PRO 2LF drive and magnetic clamp. The difference comes after the disc is read. The CD2000 sends the data out over BNC, AES/EBU or Toslink optical to a DAC you choose. The CD2500 converts it inside through the PCM1792 and four discrete analog modules, and adds the S/PDIF input for your other sources.

Does the CD2500 Come With a Dust Cover?

Only if you choose it. This listing offers the CD2500 MkIV with no dust cover or with Oracle's full dome clear acrylic dust cover. The full dome covers the whole unit down to the support table, with the rear left open for the audio and power cables, and measures 19 3/4 x 15 1/4 x 8 1/2 inches.

The Listening Room Difference

We're a third-generation family business with a brick-and-mortar showroom in Chestertown, Maryland, and a reputation built on exceptional service and relentless passion for hifi. At this level, every detail matters, and we're here to make sure you get it right. Whether you need help with system matching, setup guidance, or just want to talk through your options before pulling the trigger, owner Mike Hoatson is a phone call away. We don't just ship boxes. We help build systems, and our support lasts well beyond the sale. Call or text 410-239-2020.

Oracle CD2500 MkIV Specifications