The Biggest SUBWOOFER of the WORLD (in Milano) - full power down to 10Hz - Galerie

[tiefbassuebertr]

Originally Posted by cr0wl3y

Out of interest, does anyone understand how you can make an amplifier with no active components, driven only by transformers? That's the claim here:

AMPLIFICATORE VERO - ROYAL DEVICE Hi-Efficiency Loudspeakers Audiophile speaker systems High fidelity systems Sistemi di altoparlanti hi-end HiFi ed Alta Efficienza Lautsprecher Diffusori acustici stereo Enceintes acoustiques

This isn't a power amplifier but a pre-amplifier with voltage gain. Basiclly the same than MC/MM transformer. The higer the voltage gain, the higher the output resistance.
check out this threads for such parts:
Tube and Passive Preamps-Auto Transformers for Attenuators/Volume Control - Overview
Question on passive preamplifier - transformer section.

[chris661]

I see transistors. from the big transformer on the right, just down and left. At least 3 there...

[tiefbassuebertr]

Originally Posted by chris661

I see transistors. from the big transformer on the right, just down and left. At least 3 there...

You are right. And this is clearly an actice preamp, but without voltage gain by the transistors for coil driving (two emitter follower's are driving transformer coils) I have only transformers discovered by first look - sorry.

[compressit]

What, you don't have any equipment to accelerate the light moving through your S/PDIF interconnects, thus having it travel through time in a specialized pocket dimension at the center of a power triangle (where the quantum shift happens,) which enable playback of the original sounds before any distortion could be added by the recording process?

Clearly, this is the big news.
I got to get me one of them.

[theophile]

Originally Posted by compressit

Clearly, this is the big news.
I got to get me one of them.

You'll have to come back yesterday,they're on back-order.

[cr0wl3y]

Still don't get it. If it's a transformer-driven pre why does this guy go on about speaker impedances and 55 Watt power?

[wwenze]

Wonder how he does the biasing..

[macboy]

He only states that no active components are used for voltage gain. Apparently the transistors are used for current "gain". So, take a line level signal in, produce a high-current line-level output (voltage gain = 1, essentially a high-current voltage buffer), then step up the voltage with transformers (voltage gain = x, current gain = 1/x). Kind of the opposite of a tube amp, where you have very high voltage gain but low current, then step down with a transformer.

[bear]

So, anyhow, looks like those "sub atomic particles" are maybe electrons??



_-_-bear

[tiefbassuebertr]

Originally Posted by wwenze

Wonder how he does the biasing..

I asume, there are additional devices therefore in the detailled circuit diagram (couple caps for ac coupling and additional introducing of separate biasing network). Unfortunately I can't find it online. I don't know if this kind of topology is one of the royal way's but for me an interesting approach, especially for certainly power amps and very high efficiency speaker models. I recall, that I have see anywhere in one of the MJ magazines a similar topology - unfortunately I don't know the year and number of edition. I will look about various URL's there, if I have time:
MJ Magazine (formerly Musen to Jikken) - Yearly Index from 1924 - 2009 wanted