T15k Video - How It Works Explained By Tony D At Rockford

[trainman0978]

I am most impressed, like a few others at the small current draw of 350 amps. That is just down right sick.

Steve, aside from Chicken, and the one amp that was on ebay, how many of these things are out in circulation... I am just wondering if it would be worth making the trip to Nopi this year to see and hear one of these. The way that guy explains it, this should be the product that changes the way all amps are produced in the future. I am sure they are only trying to overcome built the equipment into a smaller package and making it more cost friendly to the average person. Once they do that , Hybrid amp technology should be available to the masses ? Any thoughts on that , since you are " in bed with Fosgate" and all ..... :)

[qu1cks1lver56]

i learned alot from this vid.

[mrwigglezdj]

lol i love trains av

[Ipod]

very good information.. and that is one crazy (in a good way) amp..

[wL<3bass]

i missed a bunch of the explanation cause the guy started talkin on his cell phone

but i now understand the way the amp worx and why its so cool

Yeh was kind of annoying I hate ppl like that.

and with only 350 amps of draw... thats some nasty shit rite there

x3 absolutely amazing!

[Decaf]

actually, im pretty sure the t4k etc are class BD. Where did you see them being called class T at?

found this about class t, which is used in my jvc-shx8500 cd player!

Rather than being a separate "class" of amplifier, Class T is a registered trademark for Tripath's amplifier technologies. It is an implementation of Class D amplifiers, but uses a sophisticated control scheme to provide very high quality audio amplification. Rather than using digital signal processing, class T amplifiers use an overall loop that is similar to a higher order Delta-Sigma (ΔΣ) (or sigma-delta) modulator. While it is called a digital amplifier, the class T amplifier is almost entirely analog; the amplifiers use a digital clock internally only to control the sampled comparator. The two key aspects of this topology is that (1) feedback is taken directly from the switching node rather than the filtered output, and (2) the higher order loop provides much higher loop gain at high audio frequencies than would be possible in a conventional single pole amplifier.

Despite superlative performance at low cost from the Class T approach, financial difficulties have caused Tripath to file for Chapter 11 bankruptcy protection on 8 February 2007.

so t1,2,3,4k are not class t, bd (big daddy )

and this about bd

In Research & Development for three years, Rockford Fosgate's new high-efficiency amplifier technology was shown to the press at the 1999 CES Show and has now been incorporated into a new digital amplifier topology, called Class bd. Rockford engineers have been granted U.S. Patent 6,097,249 for the Class bd technology. This patent involves a new technology, known as STARDUST (Single Terminal Alternating Rail DUal Sampling Topology), for audio applications - a novel form of Class BD amplification. STARDUST allows the bd class amplifier to put more than 1000 watts of RMS power in the hands of the serious car audio user - and does so in a relatively small size. This improvement has been in commercial products since the January 2000 introduction of the Rockford Fosgate model bd1000.1. Rockford Fosgate reports that STARDUST is expected to be a common element of the company's continuing program of digital amplifier development.

When considering what you are getting for your dollar in relationship to the power output, the STARDUST technology makes the Class bd amplifiers (1,100 watts for $699.99) more affordable in relationship to other typical class AB amplifiers since there is less current consumption from the charging system. In the case of Class bd amps, there is less heat generated due to the Class bd STARDUST technology. As a result, the cooler internals makes the overall performance more reliable.

Class D amplifiers work by altering the "balance" of an ultrasonic, square-wave carrier, set at equal positive and negative time duration-called 50 percent duty cycle--for no audio output. Audio output is achieved by modulating the ratio of the time the wave stays at its positive and negative states. Audio is recovered by passing the varying average value of this wave through a low-pass LC filter.

A serious drawback of this type of Class D is the large rail-to-rail square-wave "carrier" produced, leading to heating and complexity. A typical Class BD amplifier solves this problem by subtracting away this carrier in the external load. However, because the subtraction is external, it is well known to specialists of this field that it leaves an untamed, full rail-to-rail switching signal on both output leads, a nightmare RFI problem which has eluded solution during the 30 year Class BD history.

Rockford's Class bd amplifier, with its Stardust topology, suppresses the generation of this carrier wave in the modulation process itself-somewhat analogous to single side-band (SSB) radio practice. This novel solution allows all the advantages of Class BD to finally be employed-without an RFI output problem.

Edited May 17, 2008 by decafcappucino

[kryptonitewhite]

But what if youi were to play that all day long