I was looking over the 2011 brochure for the 250, and comparing it to my car. A few things had me scratching my head:

Navigation System /Mark Levinson Audio PACKAGE
HDD Navigation System including voice command, color LCD display with
integrated backup camera, Enhanced Bluetooth technology, XM NavTraffic,
XM NavWeather and XM Sports and Stocks.Subscription required. 90-day
trial subscription included

Lexus Enform with Safety Connect offers Destination Assist, eDestination,
Automatic Collision Notification, Stolen Vehicle Location, Emergency Assistance
Button (SOS) and Enhanced Roadside Assistance22 services. Subscription required.
One-year trial subscription included

Mark Levinson 12-speaker 270-watt @ less than 0.1% THD, 20–20,000 Hz23
Premium Surround Sound Audio System with 5.1 architecture and in-dash,
single-feed, six-disc DVD/CD auto-changer

I checked my car, I have the Nav package with Enform, I can count 11 visible speakers: 3 in each door, 1 in the center dash, 2 on each rear side panel behind the front seats, I can assume there is a subwoofer buried somewhere. No sign of the ML logo anywhere and the cd player does not support DVD playback. The model number at the bottom of the radio console is P1839. Looks identical to the attached picture. Did Lexus offer different audio options then what was in the brochure?

 

The ML system also has a surround feature in the setup screen.... I don't think Lexus offered anything other than the ML upgrade.

 

There was the base Navigation system. Then you also had the Navigation system with the ML package. Based on your pic, you'd have the ML system if there was a label next to the Lexus emblem on your radio, so you do not have the ML system.

The center grill on your 250 is just a cover, there is no speaker underneath it.

 

Thanks for the clarification, I was a bit confused reading the brochure.