I hate to dissilusion, but I must dispell one urban myth.
You be highly unlikely to get any gain in bandwidth by improving your cabling.
Your bandwidth is governed by your ISP.
Poor cabling may give high error rates and result in reduced throughput but it is rare to see any error rate caused by internal cabling.
Some modems will have status or diagnostic page that will indicate what, if any, errors are occurring.
Regarding central filters, it's the best way to filter, putting several filters on Teed devices can cause a static like noise on the telephone line, the effect is more prominent on ADSL2.
Street cabling which has Teed spurs (cable that runs on from your termination point) can also cause the same problem.
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