I get that but I have a Cerwin Vega cvx-21s that goes down to 29hz and another Cerwin Vega el-36dp that goes down to 35 hz I think but it goes up to 600hz and a little above and the CVX-21s I think only gets to 300hz for pro equipment especially subwoofers its better to have one with an internal amplifier, also music is not the same as movies the frequencies are a little different I use my system generally for music so I have no complaints just all my speakers are overpowered besides the subs or the bass speakers which is the best sounding of all my speakers. I got this information from a thread a while back that for any HiFI equipment there is pro equipment that will match it or beat it so if you want the best it’s in the pro section you just need to do research and jbl does have a good line of pro speakers along with many other companie, pro is for loud and clean sound hifi is for low and clean sound I guess, but pro can also play very low while also very high you get a choice unlike with HiFI that is usually overpriced per watt you get for performance. I saw a amplifier that put out about 500 watts and the asking price is 40,000 usd while the crown xti is 6000 watts at 2,199 usd, you do the math one is a scam the other is legit.