Cerwin Vega Mobile Stroker 2000.1 Guts

[riadb]

ok some of you have been waiting for these pics for a while now.

I finally opened up a stroker 2000.1 so here are the internal pics

Stroker 2000.1
2000W RMS @ 14.4V @ 1ohm
benchmarked by PAS magazine @ 2136W RMS @ 14.4V

Class GH Topology.

polished black aluminum finish with red CV striping


0awg power and 8awg speaker allen key terminals


Crossover controls, Master/Slave controls, Subsonic/Vega Bass Boost controls.


Overview of entire circuit board.


Internal turbine fan mounted on back plate


One section of the circuit board showing the oversized torroid coils


Other section of the board showing output mosfets and capacitors.




Some Info on Class GH amplifier topology -



Class G/H:
Class G/H topology uses a minimum of two +/- rail Power Supplies connected via power diodes.
At low output power levels only +/- VCC1 supplies current to the outputs and VCC2 & VCC3 are disabled.
At medium power Q2 is enabled and VCC2 is switched on (and VCC1 is opened).
When signal reaches VCC2, Q3 starts to supply current, and Q1&2 are in saturation. In this way power dissipation and efficiency are optimized over the power range of voltage on the amplifier.
Advantages
Efficient amplifier which can deliver the same output power with a smaller power supply transformer and a smaller heat-sink.
Disadvantages
Circuit complexity adds cost (expensive multi-tap transformer and multiple output devices).
Crossover distortion similar to Class B switching distortion occurs at each output level transition, when supplies switch from rail to rail. Potentially high THD @ high audio frequencies.
Crossover distortion is not at zero crossing point but also at 1/3 and 3/4 of maximum output signal
Conclusion
Class G/H topology is used in high efficient amplifiers where the cost and distortion are not an object.

[ruffneck_12]

i came

[nello-sello]

can anybody provide a review?

[Brian Steele]

Looks like a Class G design. A Class H design continuously varies the supply rail voltage, rather than switching it between more than one level.

Class G and Class H designs have actually been around for ages. Years I go I used to service my brothers' Soundmaster(?) pro audio amplifers - they were Class G designs that use to pop transisters like it was going out of style - more out of his habit of connecting multiple speakers in parallel to then than anything else.

IMO, with the advent of better Class D technologies like ICEPower (B&O) and Class T (Class D with variable switching frequency) that makes it easier to produce high-quality audio amplifiers with higher power, higher efficiency, lower cost and smaller form factors, the age of the Big-Ass Amp should have ended a few years ago. However, like speakers with big magnet structures, I guess there's still a big market for them in car audio world, where visuals can be as important as, if not more than, quality sound reproduction

[noyztoyz]

looks good to me

[nello-sello]

Brian Steele, so its not as good as the class D. that's what you saying right?

what's the damping factor of this amp? i can't find it online

[Brian Steele]

Brian Steele, so its not as good as the class D. that's what you saying right?

what's the damping factor of this amp? i can't find it online

From an engineering perspective, a good class D amp, with its smaller form factor and higher efficiency, is a better match for the car audio environment. For example, with class D tech, I can put a kW of available amplifier power below my front seat easily with space to spare, without having to worry about my bamcee getting BBQ'd by the heat from the amp when I crank the bass.

However, in the car audio world, what makes good engineering sense is only one of the factors involved when building a system. Presentation is also a factor, and this takes precedence for many. Nutting wrong with that - to each his own .

[viking1705]

is there any users who can provide reviews?amp looks decent but am not too experienced with class g/h amps.

[riadb]

so far i've installed 3 of these

amplifiers are stable down to 10V
power output is great i must say, in excess of 2000W rms
and very clean.

also the amplifiers have a very efficient induction cooling system so they barely break a sweat.

IMHO no problems with these amps, they are very good.
if i had to, all i could really complain about is the size

[Kadir]

I have 2 of these amps in my van powering 4 MTX sqaures and these amps are by far the best i have used... Power is in excess of 2000W and amps do no heat as the fans are genious. Also the sound quality is alot different. If u anybody wants to dispute the power of these amps line up against it and lets see if u could stand up

[nello-sello]

When you guys say more than 2k rms
What are u really saying?
No amp is 100 per cent efficient and plus their ratings are at 14v. Not so?
In reality then we should expect more like 1.6k-1.8k rms at 12v then maybe less for amp efficiency
And Keeping in mind class D is more efficient
Correct me if I'm wrong

[riadb]

you are right..

but the amps do give more than 2000W rms @ 14.4V....somewhere around 2150W when i benchtested them.

@ 13.8V the amplifier gave 1901W @ 1ohm with an impedance rise to 1.35ohms.

@ 12V the amplifier gave out 1758W @ 1ohm with an impedance rise to 1.23ohms.


class GH has the same efficiency as a class D but the SQ of an AB amplifier. Smaller power transformer, less heat which leads to lower levels of thermal compression.

[3stagevtec]

why need an internal fan if they are as efficient as a class D? would like to hear them perform though..

[noyztoyz]

well done riad numbers talk but tell us briefly the testing method

[Brian Steele]

why need an internal fan if they are as efficient as a class D? would like to hear them perform though..

The efficiency of Class G amps usually lies somewhere between Class AB and Class D - see http://en.wikipedia.org/wiki/Electronic_amplifier , so I wouldn't say that they're as efficient, all else being equal. However, there's a bit more involved than simply the output stage in the amp, so real world you may find Class G amps that are very close to Class D amps in terms of efficiency.

And realise that even if the amp is 90% efficient at peak output of 2kW, that's still over 200W of power that the amp's chassis had to dissipate at that level. No-one listens to their music at a continuously high level though (unless you're deaf, LOL), so heat dissipation requirements may be quite a bit less.

[riadb]

borrowed some batts and a variable voltage 80A battery charger.

clamp ammeter, voltmeter and ohm meter.

and some audiopipe 10" subs

i dont have all the #'s on me at the moment but i ran the amp off the preamp in my car using a 60htz test tone got volt and amp readings and did the maths.

when i find the scrap paper i'll post up the #'s.....daz if i find it

[3stagevtec]

^ ok, you've got my attention..

[noyztoyz]

me too, keep talking
i did that a couple times and then some1 electrical guy bought the fluke clamp from me so i have to get back one.