I have to say, I never noticed that! This probably explains why I did NOT like the Mackie sound, 
either in a showroom where all the monitors were lined up along a wall or at my friend's studio 
where he's got them backed up under a shelf and close to a wall.

Behringer copied Mackie's design somewhat, but I don't think the powered ones have the radiator in 
back. I have the passive ones and they sound way better than they have a right to at that price. The 
passive ones have a port in front and the back and sides are sealed. I think part of their 
cheap-but-excellent secret is good bracing on the cabinets so they don't resonate at any reasonable 
SPLs. I monitor at 85 dB peak SPL, so I'm not crunching the cabinets too hard.

-- Tom Fine

----- Original Message ----- 
From: "Lou Judson" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, February 08, 2013 10:07 AM
Subject: Re: [ARSCLIST] Passive radiator loudspeaker was Mono but Out-of-Phase


In the back, behind the amplifier. The newer ones are slightly different; it appears the radiator is 
behind a grill around the amp.

The rear radiator makes them particularly senzitive to being loated close to a wall behind then - 
they are better off out form the back wall a foot or three.
<L>
Lou Judson
Intuitive Audio
415-883-2689

On Feb 7, 2013, at 10:16 AM, Tom Fine wrote:

> Someone said Mackie uses passive radiators on its "studio monitors" nowadays. Where is the passive 
> radiator? I thought the Mackie monitors have ports, in the front.