Do you think you need a subwoofer?

Dear @mke246  : Good. That " well defined bass as low as 31hz " yes is incredible coming for 1927.

Good luck with your 7360's.

R.

Dear friends: Along the other 2 Harman links I posted in this page this one could be interesting for almost all of us:

Harman How to Listen

R.

@mijostyn  : Balanced force in sub's is not something new, Thiel and ML did it along other manufacturer before.

" I am surprised that nobody is making cylindrical subwoofers. " , not today but in the past HSU was a proffesional proponent of that design and they manufactured subs's that gone as lower as usuable 4hz frequency.

In reality, it's almost nothing new about sub's but differences in its quality design implementation and digital crossover technology that in the past never been used.

R.

@rauliruegas I did not say it was new and I recommend ML subs all the time. KEF does it with the Blade.  Magico does it with their Q subs. 

I am not familiar with HSU, but good for them. You are also right that digital bass management with crossovers, room control and EQ have improved the situation greatly.

I have two Model 4 subwoofers up and running. They measure great with a slowly downward sloping curve from 100 Hz down. They are 3 dB down at 20 Hz. This is without correction, with the crossover deactivated. They do not shake or vibrate at all running a 20 Hz test tone and white noise at 90 dB which is as loud as I can go before things start falling off shelves. 

good.