If you still haven't traveled than may be my answer can help you
. Airline doesn't care about speakers just they care dimensions due to different type of aircraft used so basically just book any airline which have checked in size restriction more than the size of your stuff( do check l*B*H restriction) and weight max strict 32 (generally all the airline allow you till 32 with extra charges)I will very strongly advise you to send your stuff through out of gauge belt and with my exp i never faced any issue .(heathrow --> delhi always)
Customs(Only Delhi)
Generally they wont care for suitcase and even if they ask just say old speakers & used with cost less than 50 thousand (They only know bose even lot of my friends
)For boxes they might ask and will have a scan Thats it
With my exp i noticed BA airline most of the time allow oversize bag for free (please also confirm in email apart from site
) upto 2 bag( 2nd bag will cost 40-50 pound) so you can even bring your floorstander just take care of again oversize limits and weights.
