With my vast experience being a sound engineer for many years, I used most DI boxes available in the market both in the studio and in Live Sound and I have to say that as far as Piezo pickups is concerned I've found that Radial statements are correct and represent my experience when using a Piezo with a 1 Mega input DI box when compared to 5 Mega or 10 Mega, and specially with instruments like Double Bass the difference/improvement is quite dramatic. This higher impedance also broadens the frequency response for a more natural and pleasing sound." "Unlike typical direct boxes, the SB-4 features a very high 5 meg ohm impedance that smooths out troublesome peaks that give piezo transducers a bad name. "The PZ-DI has a variable load selector switch that allows you to set the input impedance of the direct box (.) The third setting is an ultra-high 10 meg ohm impedance that is specifically designed for piezo transducers, helping compensate for the harsh or squawky tone that can occur when a piezo is connected to a lower impedance input." These are Radial statements on both of them: The tone of an electric guitar can be clearly identified with the frequencies above 4kHz being severly attenuated by the inherent roll-off of a typical guitar loudspeaker. Just the same, attenuation of high frequencies in some cases does not mean that they are perceived as missing. I've never felt frustrated with a piezo guitar into 1 Meg. IMO it makes the mechanical noise (pick attack) too prominent. Now I know some (Whoops) advocate 10+Megohm, but I don't. The same consideration is what allows bass amps equipped with 10 inch speakers to produce a credible sound even on the low-B string. The pick-up system is typically capable of picking very low frequencies, with the only restriction of the high-pass effect of the load it is presented with. That shows that for a faithful reproduction of sound when using a pick-up, full LF response is not a requisite. The same aplies to the guitar, where the resonance happens between 110 and 200 Hz, so significantly above the lowest string. The relatively low level of fundamental on bass instruments is not a complete absence ot it. Numerous studies have shown that the sound of the double bass on the low strings has a small level of fundamental, the second harmonic being dominant. It means that the maximum efficiency is achieved about one octave above the lowest frequency. Typically, the double bass, which goes down to 35 (in drop-D tuning) has its acoustic response resonance located at about 70Hz. Instruments themselves don't have full LF response. So the latter could justify an inout impedance of 4+Meg. Standard tuning for a 6-string guitar has it's lowest note at 82 Hz. However, we're dealing with instruments that don't go down to 20Hz. It's actually true that, in order to provide full LF response ( ), the input resistance should be about 8 Megohm. Click to expand.That is a very debatable subject.
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