There is even a special vertically mounted board that is designed to shield the sensitive input circuitry from unwanted electromagnetic interference caused by the power supply. Lest you think the amp is all brawn and no finesse, I should direct your attention to small but important details such as the use of top quality FR-4 doublesided plated-through glass epoxy circuit boards and high speed polypropylene capacitors. There are another eight TO-247 size International Rectifier HEXFETs in the output section rated at a minimum of 30A each, giving the output of the amplifier a conservative current output capability of 240A! Inside the T2500-1bd is a twin toroid power supply that uses no less than twelve Fairchild TO-247 case size N-Channel MOSFETs, each rated at 75A. Maximum Current full power 1 ohm per ch.: 310A Mascimum Efficiency at full power per ch.: 83.6% Signal to Noise Ratio refereced to full output: -96.7dBAĬEA-2006A rated 4Ω Power (minimum power per channel developed over entire audio bandwidth: 1230 watts/ch The set screws that retain the cables are now a hex head style and are thankfully finally all the same (4mm) size! This is the type of fundamental feature change that makes life simpler for installers and shows that even a large company like Rockford pays attention to feedback from the install bays around the world. The power and ground terminals now easily accommodate 1/0 wire, and the speaker terminals will accommodate 8 gauge speaker wire. And speaking of terminals, the engineers at Rockford Fosgate clearly understand the kind of current this much power requires both on the input and output side of things. Other nice upgrades from last year’s amplifiers include panel mount style RCAs for both input and output signals, and easier to connect power and speaker terminals which are still all found on the long front edge of the amplifier. The key to this technology is a method of constantly monitoring the amplifier’s temperature and operating conditions, and controlling the output current to provide longer playing times. What this means in real terms, is that the amplifiers can be driven hard for long periods of time, without worry about thermal protection shutoff spoiling the party. Measuring 22” long, but only 8” wide and 2” high, the Power Series amplifier’s size belies the amount of power on tap, by incorporating a technology that Rockford Fosgate calls DTM or Dynamic Thermal Management. The power meter is basically a cool bit of bling with no real significant purpose, but the battery voltage meter is quite accurate and does a great job of letting you know the condition of your electrical system, which as you read on, you’ll find out why it’s so important. ![]() While invisible when shut off, they can put on quite a show when the amp is at full song. Most notably, there are stylish and well executed power and voltage meters built into the top cover of the amp. While the model is new for 2009, the cosmetic changes are evolutionary, rather than revolutionary but incorporate some cool changes when compared to the previous year’s models. "The T2500-1bd is a serious amplifier for enthusiasts who crave big power on their subwoofers." But for those Fanatics who live by the old RF motto of “Too Much Is Just Right”, the T2500-1bd is also a strappable design, allowing you to drive a single woofer coil with two of these beasts! With power output levels rated at 1000, 1800, and 2500 watts into respective 4, 2, and 1 ohm loads the T2500-1bd should have plenty of power for basically any application. The new for ‘09 design brings a marriage of Rockford’s patented Class bd technology and a polished, and more importantly, technically significant cosmetic design. The Rockford Fosgate T2500-1bd amplifier is part of the widely acclaimed Power Series. Now, from one of the original founders of serious car audio power comes a new, formidable subwoofer-driving powerhouse.
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