I have an old set of Tannoy Precision 8D monitors that were stored for a long time and I want to get them back up and running. One had a bad amp. So I found a replacement amp and bam it sounds fantastic..the other one was working but sounded...well small. I didnt think much of it. Then I compared the two and realized I was getting almost zero low end. Then I touched the woofer itself and the woofer surround was so hard it actually cracked. I'm wondering what can be done to soften up the offer surround or maybe repair them? Thoughts? Options?