Limiting a full range driver

I would just keep the low pass setting of the sub at it's lowest setting (many are 40 or 50hz) to keep it well out of the lower male vocal range, which typically starts around 80hz, but some basement dwellers can get near 60hz.    I would only attempt to limit the LF of the main speakers if this doesn't give a satisfactory blend. 

This is one of those it-may-or-may-not things. Even if you crossover the drivers at 100hz, they are still 8-inch drivers. The midrange performance should not change since the relationship between the radiating area and wavelength (frequency) is still the same. The bass performance is probably not at the expense of midrange and instead attributed to the driver's excursion remaining linear throughout the frequency range at realistic volume levels.

Wow, some very interesting posts here. Some are the opposite of others, but I want to thank everyone for their thoughtful and honest opinions. As is usually the case, I will have to try it to find out. Well, at least I have a lot of tinkering to look forward to.

It seems to me that you're running the Ref 3As full range without a sub.  Before you go adding filters and subs, have you experimented with moving the speakers around in the room to see if you can smooth out the tonal balance that way?

Hi Koestner. You are right on the money. The level of distortion and volume limitation low bass causes in full range drivers is unacceptable. It is the single most significant thing you can do. Room control is important but it will do you no good if your system is volume limited and distorting. I have made this AB comparison for other people many times. I use full range ESLs. By themselves they are big polite loudspeakers, good at Jazz and classical. Crossing to subwoofers at 100 Hz is like putting a turbocharger in a 911. Hold on to your hat.

There are several obstacles, finding a decent subwoofer and a good active crossover. For subs I suggest the Martin Logan Balanced force series and the KEF KC 92 also a balanced force subwoofer. This is an extremely important design feature, it helps to limit distortion by keeping the enclosure from shaking. 

The best crossovers are digital. However, now you need four DAC channels instead of two. The inexpensive MiniDSP is a fine crossover, but the DACs are not so hot. The MiniDSP SHD Studio gives you a fine crossover and room control and you use your own DACs. Benchmark Media Systems uses this set up with their own DACs. That is a $6000 bill. Preamps such as the DEQX Pre 4, the Trinnov Amethyst and the Anthem STR have everything built in. The STR is under $4000.

I have no doubt that if you do this right you will be THRILLED with the results. Don't punt, take a full swing or you will just waste money. If you want to discuss this more please message me.