The main advantages of 24 bit processing (recording, editing, mixing and mastering) are an increased dynamic range and lower noise floor. Simply put, 24 bits is said to provide better audio quality. Pro Tools 24 can be purchased new or upgraded from a previous Pro Tools system.

Features

Digidesign has made the Pro Tools III PCI Core system upgrade a two step process. The initial purchase includes version 4.1 software and a new PCI-bus d24 audio card (the original I/O card needs to be returned to the company). The d24 card utilizes a Motorola 56301 processor and connects to the Digidesign audio interface.

Additionally, the existing 888 audio interface should be returned to Digidesign for “factory refurbishing.” This upgrades it into an 888 24 I/O Interface. While the 888 upgrade is not required, it makes sense for complete 24-bit compatibility. The new A/D converters are 24-bit Delta-Sigma with stated signal-to-noise ratio of -113 dB (balanced A-weighted). However, the D/A converters are 20-bit Delta-Sigma. The signal-to-noise ratio is -110 dB (balanced A-weighted). Bandwidth specifications on both converters is 22 Hz-20 kHz. All things being equal, a higher bit resolution is more critical on the input conversion rather than the output. Also, the 888 24 I/O Interface can now be used as a stand alone A/D or D/A converter - all 8 channels.

Other new features in Pro Tools 4.1 software include support for Mackie Design’s new HUI Controller ($3,500). HUI (Human User Interface) provides an integrated and tactile control of all Pro Tools functions. Also new is compatibility with Digidesign’s Universal Slave Driver (USD). The USD ($1,995) allows Pro Tools to have extensive synchronization functions for audio and video applications.

Yes, this upgrade comes at a price. And we are not only talking about dollars and cents - or are we? Traditionally, mono audio recorded at 44.1 kHz at 16 bits requires 5 megs/minute of disk space. The same audio recorded at 24 bits requires 7.5 megs/minute. Additionally, 64 megabytes of RAM is now a minimum requirement. With some system configurations, a qualified SCSI accelerator may also be needed for optimum performance. Lastly you will need Mac OS 7.6.1 or higher. However, the good news is that the new Core system now provides 32 tracks of digital audio. And Pro Tools 24 can be expanded to 48 tracks (64 tracks are available on specified configurations) and up to 72 I/Os.

Summary

Is the upgrade to Pro Tools 24 worth it? That is for you to decide. Sooner or later everything will be 24-bit. So it is only a matter of time. To put things in perspective, the jump from 16-bit to 20-bit is more dramatic than 20-bit to 24-bit. But then again, that is the price of technology. If your studio needs to maintain its cutting edge, the question is a no-brainer. Go for it. Otherwise, Digidesign has substantially reduced the price of its 16 bit, 16 channel Pro Tools III system. How can you say no to that?

PCI Pro Tools III Upgrade Exchange:
d24 Card and Pro Tools Software 4.1 - $1,495
888 I/O to 888/24 I/O - $1,995
(note that other upgrades exist for NuBus and Project systems)

PCI Pro Tools III Upgrade Exchange for purchases after July 1, 1997
d24 Card and Pro Tools Software 4.1 - $495
888 I/O to 888/24 I/O - $749
888/24 I/O - $1495

New System Configuration:
Pro Tools 24 Core System - $7,995
888/24 I/O - $3,495
Pro Tools III System - $4,995
888 I/O - $2295