Bought secondhand for a ridiculously low price (they are not too many new ones), these 30 cm intrigued me by their performance on paper. Boomer 12 inches high FCR game in simulation programe design speaker, the response curve raproche from that of some 38 cm woofers.
Use with Dynacord amp PAA990 of 300 W at 8 ohms so (not powerful enough for Hp), boomers are more widely accepted. First in sub cut at 100 Hz crossover and working with RCF ART 310A (it was not top).
I then reassembled the cutoff and I noticed that the sound improved taking more definition in the midrange. Finally realized that this was not its proper use, I put a horn and a power much higher (1200Hz). So exellent broadband two-way done, the sub is not his thing ... Although on paper it appears to do.
Originally mounted in a compact 43-cu. The result is astonishing for a hp of this size (amp beefy 500/600w predict that cash!). I saw the volume to increase with the addition of the trunk and engine. It follows and is quite convincing in yield and quality for pregnant amateur.
Although there are low, do not expect to get the 40 Hz of these L12P540, why we need larger diameter Hps.
The compromise weight, price, performance, power, sound quality seems good, nevertheless, even buying new speakers. The strength is to go.
Resold to regret because I duplicated at the time of purchase of my MP 412 JBL.