Schuesmp Posted July 25, 2022 Share Posted July 25, 2022 (edited) I am considering adding two Vandersteen SUB THREE subwoofers to one of my two-channel audio systems. The system features JBL L300 Summit speakers (circa 1980) and two Balanced Audio Technology (BAT) VK-76SE vacuum tube power amplifiers configured “by wire” as mono blocks. The focus of this post is proper implementation of the Vandersteen M5 High-Pass Crossovers (specifically, model M5-HPB) with the aforementioned “by wire” configuration of the BAT mono block power amplifiers. This configuration involves the following: BAT VK-53SE preamplifier -> Pair of XLR analog interconnects -> Pair of Y cables (single XLR female to double XLR males) -> BAT VK-76SE power amplifiers (each of the Y cable XLR males connect to one input of each BAT power amplifier - four connections in total) - Jumper cables connect the left and right speaker outputs of each BAT power amplifier to fully achieve the “by wire” mono block configuration -> Speaker cable from one pair of speaker outputs (binding posts) of the interconnected speaker outputs -> JBL L300 Summit Speakers My sense is that I would simply insert each Vandersteen M5-HPB High-Pass Crossover between the applicable XLR analog interconnect cable from the preamplifier and the applicable Y cable, but I may be missing an important consideration or obstacle. For example, does the connection scheme impact selection of the appropriate input impedance rating within the M5-HPB? The manufacturer of the power amplifiers (BAT) identifies the input impedance of each phase as 100k ohms (200k ohms summed). Intuitively I would select 200k ohms in each M5-HPB but, again, I may be missing an important consideration. Of course, in view of the benefits of potentially adding two Vandersteen SUB THREE subwoofers (e.g., relieving the power amplifier of low frequency output) and the relatively high sensitivity without substantial impedance dips of the JBL’s, I could simplify the setup significantly by running only a single BAT VK-76SE power amplifier in stereo mode, outputting a very beefy 75 watts per channel (150 in the current mono block configuration), but I would like to avoid this compromise if possible. The forum’s guidance and views would be greatly appreciated! Edited July 25, 2022 by Schuesmp Link to comment Share on other sites More sharing options...
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