Zapco Studio-X Class A/B Full Range Amplifiers
There are six full-range amplifiers in the Studio-X series and all are Class A/B and all use bi-polar output devices for the smoothest possible sound. And, all are packed with all those features you want. Common features of the ST-X amplifiers include variable HP/LP/ Full Range electronic crossovers, variable bass boost, variable gain by channel pair, speaker level input, heavy-duty positive lock terminal blocks, and preamp outputs to daisy chain out to the next amp in your system without having to add more RCA cables. And the most important feature shared by all the ST-X amps is the legendary Zapco sound quality, developed with over 40 years of experience.
The ST-2X is the 2-Channel ST-X amplifier with 50 Watts RMS/Channel and less than 0.05% THD + noise. With a chassis of only 15.4 cm x 16 cm x 5.2 cm, it provides great Zapco sound and all the ST-X features in a chassis that fits unobtrusively in the smallest of cars. In fact, this amp is the choice for Class A/B sound quality in motorcycles and other power sports vehicles, and other limited space vehicles. The ST-2X is now available with a lot of SQ upgrades, check out the new ST-2X SQ.
The ST-4X II is the 4-Channel ST-X amp and it’s also rated at 50W RMS/Channel. This amp has been out for about a year and is by far the fastest-selling amp we have ever made. With 320 watts RMS, the versatility of the bridgeable 4-channel platform, and all the ST-X features, the ST-4X II is an excellent balance of power, sound performance, and price.
First, we have created the ST-4X SQ for the customer who appreciates the finer points of the music and wants to invest a little extra for a more “live” sound. We did this by upgrading the caps and op-amps and making a few other changes. The SQ version will have a more open sound and a more precise sound stage. We also used Tiffany-style panel mount RCA connectors on the ST-4SQ for a solid signal transfer.
Then, for the Rock, Country, and Hip-Hop fans, and anyone else who wants the bottom end “loud ‘n clear”, we designed The ST-4X P. P for Power! For the ST-4XP we have boosted the supply voltage, used higher voltage output devices, and upgraded the supporting components to get a 60% increase in RMS power to 80 Watts/Ch. @ 4Ω and 120 Watts RMS /Ch. @ 2Ω. That’s 480 Watts RMS of Class A/B power in a chassis that is only 28.2 cm x 16 cm x 5.2 cm.
The ST-5X is the All-In-One Studio amp. The ST-5X mates the ST-4X P with 80W/Ch. x 4 @ 4 Ω to a bass amp with 200 Watts RMS @ 4Ω. This is truly a powerhouse in a compact chassis. Like the other ST-X amps the ST-5X is Class A/B even on the bass end, so you get tight solid bass. You can bridge this amp at 4Ω and get 300W RMS x 2 and 300Watts x 1. The ST-5X has an input mode switch so you can use six channels of input, or only four, or even just two channels, and get all 5 channels of output. So if you only have a stereo head unit you can still drive front and rear speakers plus a subwoofer. Altogether, a lot of punch in not a lot of space. Of course, the ST-5X doesn’t have the pre-outs...it has the next amp already built-in.