Dual layer, write-once blanks aren't that expensive, I've seen them for less than $1 US a blank when bought in a bundle. Sure, it's cheaper to use two separate single layer blanks, but there's the convenience factor to consider.
The only reason I didn't use DL blanks is because I didn't need them and I saw a test that showed that the second layer showed a higher error rate. I didn't look it up lately, but if I needed DL, then I'd go back and see if it's any better.
“An engineer explained to us that hundreds of ear impressions were gathered in the name of research, and while each one obviously boasted its own unique shape and size, one single characteristic remained uniform across the board: the entrance into the ear canal is not a perfect circle, it's an oval.”
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Dual layer, write-once blanks aren't that expensive, I've seen them for less than $1 US a blank when bought in a bundle. Sure, it's cheaper to use two separate single layer blanks, but there's the convenience factor to consider.
The only reason I didn't use DL blanks is because I didn't need them and I saw a test that showed that the second layer showed a higher error rate. I didn't look it up lately, but if I needed DL, then I'd go back and see if it's any better.