Who makes an active speaker that isn't ported?

Timf - To go along with a dose of subjectivity, I believe there is science to support the theory that a sealed enclosure will produce a more accurate bass response than a ported design.

Zoya - An active speaker is one that is not passive. Just kidding! ;-) An active speaker design is one that contains its own onboard amp, similiar to powered subwoofer. Each driver is supplied with a predetermined amount of power (i.e. 50 watts for the tweeter, 100 watts for the midrange and 150 watts for the woofer). This design eliminates the need for XO's and thereby fixes many of the issues surrounding bad XO design, which introduce distortion and other undesirable effects. By supplying each driver with its own dedicated amp, speakers that are active tend to have a less colored more accurate sound. Think of it as a properly aged wine - richer, fuller, smoother etc. Many believe this type of design would be more popular if it wasn't for the penchant of most audiophiles to continuously tweak their upstream components.

Dawgbyte sez:

This design eliminates the need for XO's...

No, no! You ALWAYS need filtering with a multidriver spkr system. It's just that the XO can be placed before the amp(s), each amp unit thereby connected directly to a driver & amplifying only part of the spectrum.
And since it's at line level, the signal is low and there is less distortion induced than with regular passive spkrs, and there is better control. Also, amps work effortlessly, amplifying only a few octaves AND driving the driver voice coil directly. Cheers

"This design eliminates the need for [PASSIVE] XO's."

Active equalization is almost always incorporated in the design of an active system. But I am in total accord on getting rid of those nasty inductors. We worry and kvetch over speaker cabling, but disregard the yards and yards of wire in the inductor of nearly every speaker extant. The subject has been well-hashed in the archives.

On ported vs. sealed enclosures. This debate is closing in on the vinyl vs. digital and tube/SS wars. I would think both designs are valid, thought not without a sonic signature attributable to both. That said, we seem to get caught up listening to the technology instead of the music. Maybe it's just me, but I recently discovered [with the kind help of a fellow Audiogoner] that I have pretty good gear, good enough to stop fretting over its quality. The point of the game is to Enjoy the Music. So I bought lots of music at my local HiFi Hut, and I could not be happier. This revelation came admittedly late in the game, about 25 years worth. But I learned the lesson and now I really enjoy my tunes, and still admire the hardware that gets me there. I wish you and all lovers of music the same. Good luck in your quest. *Sorry for veering off-thread but it seemed relevant.*

Gregm - you're correct there are XO's in active speakers. What I meant to say is... well, precisely what you pointed out. My mistake.

Cinematic Systems... I thought ATC's were ported in the front. What multi-driver model is not ported?

The ports are not a bass alignment, they are to release pressure from the cabinet under high SPL conditions, same with the Meyer Sound reference monitors.

So they are ported but not to extend bass frequencies.