RBH Sound 1001RB/210 manual Electronic Crossover, Equalization, Voicing Filters, V.E. Technology

1001RB Series

Tech Talk

Electronic Crossover:

Bi-Amp systems allow the crossover to be electronic and therefore, have much higher quality than passive cross- overs. A crossover separates the sound into two parts (high and low frequency). The highs are sent to the horn or high frequency cabinet and the lows are sent to the woofer. In an ideal system, adding the highs and the lows back together would recover the original signal. Most passive Bass systems have very poor crossovers, resulting in severe signal corruption. When these signals are added back together (as in your ear), they have very little in common with the original signal. The 1001RB Series uses a Constant Voltage crossover which results in very little signal corruption. In fact, when the high and low signals are added back together, the result is extremely close to the original. This makes a two-way system sound more seamless, and less artificial. We have also included a Tweeter Hi-Cut switch in the crossover, which rolls the tweeter off above 10kHz giving it a less glassy, more cone like sound.

Equalization:

The sound you want is in your head, but you just can’t get it. You think it’s you, your bass or maybe your amp. Yes, your amp. Standard tone controls and graphic equalizers don’t get it. Sure, they give you plenty of variation, but they don’t provide what the instrument really needs. The fact is, graphic equalizers are intended for room equaliza- tion, and are only put in bass amps because it’s a no- brainer for the designer. The equalization in Gallien- Krueger amplifiers reflects 30 years of continuous development and refinement. The GK equalizer is unique to the industry, it’s not just a normal four band equalizer, each section is a special circuit optimized to perform a Bass specific job in its range of operation. These sections are wired in Series, so they add to one another creating a tremendously flexible equalizer, that doesn’t sound weird at any setting. You actually might even get to hear that sound in your head.

Voicing Filters:

Voicing filters are used to completely re-voice the amplifier. In the case of the Contour and String Bass controls, the effect is dramatic.

The Contour control tunes between two different shaping circuits, with greatly different response. With the control all the way up, the low end is slightly boosted, the mids are dropped and the high end is pushed up. This is a response contour not available with a normal equalizer, and is only found in GK amplifiers.

The way a Bass amp deals with the instrument low string is a critical part of it’s sound. In fact, a five string instrument requires an entirely different low end re- sponse than a four string instrument. No equalizer can make the necessary adjustments to accommodate both, however the String Bass button on the 1001RB Series does just that. When it is out, the 1001RB is voiced like the 800RB (the world’s classic four string amp). Push it in and the 1001RB is voiced for five string instruments. For some playing styles you may want it in, even with a four string instrument…at least now, you have a choice!

“G.I.V.E.” Technology:

As in all GK pre-amps, the1001RB Series pre-amp incorporates what we call G.I.V.E (Gate Induced Valve Effect) Technology. We use field effect devices with the gate biased in a way that emphasizes the optimum harmonic content of the signal. Working in concert with our unique Four Band Active Equalizer, and three stage Voicing Filter Section, G.I.V.E. technology produces a consistently pleasing bass tone.

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