for sale is a Alesis HD24XR digital multitrack recorder, perfect working condition, low hours of use studio spare, manual and 1 disc caddy, plus remote includedonly 1 unit for sale on this listing, Jim Williams Modified: it's as good as any converter can get while still retaining the depth and surround of analog. 
Here’s what Jim Williams did to this Alesis HD24XR… 
*  Installed Linear Tech LT1359s On The DAC PCB*  Installed BurrBrown OPA4134 Op-Amps*  Installed New National LME49740 Quads Op-Amps *  Installed Polyprop Film Bypass Caps *  Rebuilt Power Supply *  Installed Low Noise Fan *  Installed Filter Foam In The Air Intakes HD24 is the world's first 24-track hard disk recorder designed to fit into any ADAT environment and match ADAT's legendary performance and affordability.HD24 is built exclusively for the purpose of recording music instead of data, resulting in remarkable stability and performance. HD24 enables engineers to record up to 24 tracks of high-resolution 24-bit recording at 44.1 and 48 kHz sample rates.Two hot-swappable media bays provide convenient access to recording drives and allow data backup in minutes. You can edit tracks internally or easily transfer to computer via an Ethernet connection.HD24 features ADAT Optical and ADAT Sync, enabling it to work efficiently with existing systems. It offers the same exceptional user-friendly interface ADAT users have come to expect.HR24 packs 24 channels of digital audio I/O into a single-unit recorder that easily fits into any environment.Alesis reinvents digital recording. AgainIn the studio or on the road, the Alesis ADAT-HD24 Digital Recorder gets the job done. This 24-track, 24-bit/96kHz hard disk recorder was originally designed to fit comfortably into any standard ADAT environment and match ADAT's legendary performance and affordability. Today, more an more pros are using the HD24 for high-quality audio capture, while freeing up computer resources for more processor-intensive plug-ins, virtual instruments, and mixing. The onboard 40GB hard drive can be easily extended with low-cost IDE computer drives that are as affordable as traditional ADAT tape on a per-track basis. 2 hot-swappable media bays provide convenient access to the recording drives and allow quick backup from one hard drive to another. The only HD recorder that includes ADAT optical format and ADAT Sync to work efficiently with existing ADAT systems. 44.1kHz and 48kHz internal sample rates, slaved to external word clock, with 96kHz and 88.2kHz option. 12 tracks at 88.2 or 96kHz through the digital ins. 24 tracks at 44.1 or 48kHz through the digital or analog ins. 103dB A/D/A converters. Internal editing including cut, copy, paste, and track-move with undo. Multiple units can be synchronized to create a larger system. 24 analog ins and outs, ADAT Optical in/out, word clock in. All necessary hardware and connectors included.FEATURES24-track, 24-bit digital audio recording44.1kHz internal sample rates12 tracks at 88.2 or 96kHz through the digital ins24 tracks at 44.1 or 48kHz through the digital or analog ins103dB A/D/A convertersSlaves to external word clock40GB built-in HDDual recording bays accept standard IDE drivesInternal editing capabilitiesCan run with multiple units24 analog ins and outsAll necessary hardware includedSPECIFICATIONSADAT-HD24 Digital Recorder