The MusicTech Magazine have Rated The Bb-D1 DI as 9/10!
Jfet is The Key!
Bumblebee Bb-D1 is an active Direct Box with a Jfet input stage and a custom toroidal output transformer that we’ve designed particularly for this application. Jfets are know to be the most “tubey” sounding semiconductor elements with sonic coloration resembling the character of pentodes. Moreover, Jfets have very high input impedance, which is beneficial for passive guitars and basses due to detailed reproduction of the high frequency range, making the sound dynamic and lively. Toroidal transformers have many benefits as well, the most important of them being a very high natural immunity to EMI eliminating the need for extra screening and very low winding resistances minimizing the signal loss and thermal noise.
Bb-D1 Active DI Operation Overview
Bumblebee Bb-D1 active Direct Box does not have a negative feedback, which is very beneficial for the sound quality, but the downside of such approach is the necessity to sort the Jfets in ranges by their Idss (maximum idle current) and to pair with different source resistor (Rs) values for each range. Not too good for mass production, but perfect for small series boutique company. As a result, you get the ultimate quality for a reasonable price.
The other important detail is the application of phantom power. It is not a secret that the quality of phantom power supplies in modern budget equipment is often questionable. Therefor, the direct box features a two-stage passive filter and an active voltage regulator made with three zener diodes, in order to make sure that only the perfectly clean current is powering up the device.
- Input Impedance: 10 MOhms
- Maximum Input Level: 1.25 Vrms (+4 dBu)
- Output Impedance (Balanced Out): 50 Ohms
- Output Impedance (Amp Out): 10 KOhms
- Dimensions (L x W x H): 135 x 75 x 45 mm