Mass Conversion of Cassettes to PCM WAV

Basically I have 5000+ cassettes which need to be digitized to a PCM WAV file and I want to do this as fast as possible while maintaining quality. I have looked into converting four cassettes at a time with no luck. The only requirement I need is high speed dubbing since the cassettes are C90s. On the cassettes is mostly speech.
Once digitized the files will be archived and then edited at a later date. The cassettes are deteriorating over time and we are trying to save as much as possible.
What type of equipment and or setup do I need to make this happen?
Where could I look for more advice on this subject?
Thanks in advance.

There is no reason why using four cassette decks and a suitable multichannel audio interface that you cannot record fours tapes at once using Audition's Multitrack mode.
Another method of speeding up transfer is to use a four track cassette player that can play both sides of an audio cassette at once using a four channel audio interface. It is then easy to reverse the second side to get it to play forwards after digitising.
A combination of the above with four 4 track decks and a 16 channel interface would allow you to transfer both sides of four tapes in one pass taking just 45 minutes.
If you can find suitable high speed cassette decks you could record at double speed digitising at 88.2k sample rate. It is then very easy to halve the speed by changing the sample rate to 44.1k.
One of the snags with the above scenarios is that you cannot quality monitor all the tracks to be able to document any technical problems that happen during playback to log into the archive database. It can only be done in more or less real time after the event which means that you should not dispose of the original media until you are sure that the transfers are the best that they can be.
Once the audio is digitised the files should have copies stored on several different hard drives located in different places so that you have backups of everything. Generally it is accepted that data isn't safe unless it is stored in at least three different places, one of which would be best to be on a different continent. This will protect you from loss due to data storage failure, fire, flood, accident etc. in any one place.
In the UK there is info for archiving all types of media @
Jisc Digital Media | Home
Or in USA from the Library of Congress
Audio - Personal Archiving | Digital Preservation - Library of Congress

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