For those who knows how to read FR/CSD, SBAF has some diagrams up for view at Link.

From the graphs it looks the 5K to 8K peak was not smoothen out but in much more flatter than it was with the mid range more flatter. From what I remembered the TH900 had a weird V shape signature which I personally do not like where the mids were VERY recessed.

You could opt to ship through a us based freight forwarder. Only exception is if the vendor included a commercial invoice then it's no running from under declration.

Whether it's personal or business, you're still oblige to pay whatever duties/taxes you're due.

RM500 is a baseline tax on the likelyhood you can get tax, I've had items >RM1000 not paying a single tax. On the other hand I had an amp with a declaration of $1000 declared as a "headphone" which had a different tariff heading which had a lower tax rate.

Taxes is normally calculated based on what the commercial invoice retail price + (shipping & insurance) of your shipping choice.

Like Lego Warfare mentioned, I've had bad experiences shipping through FedEx where they overdeclared an item I ordered years ago which I ended up paying about RM100 more than I intended to. No issues with DHL and EMS though EMS has a higher chance of escaping taxes (had one amp just delivered escaping the whole taxable amount).