By Mark Frink • February 20, 2013 Bi-amplified or Passive? Most loudspeakers originally included built-in passive, high-power crossover networks to split the amplified signal and send lows to the woofer and the highs to the horn. Today, most two-way loudspeakers can be bi-amped, powering woofer and horn with their own amp channels, with each amp channel filtered for the frequencies its driver reproduces with an active or line-level crossover. Not only are HF horns several times more efficient than LF cones, they also require less energy due to their portion of the frequency spectrum. The advantage of bi-amped floor monitors is that when they’re pounded with kick drum or bass, the LF amplifier can peak without distorting or clipping the HF amp and its horn. If you never need loud wedges in your venue or for your band, passive wedges can save money by both halving the number of amp channels and eliminating active crossovers. A hybrid approach would be to use a number of passive wedges, while also supplying a couple of beefier bi-amped wedges for the drummer and bass player, as well as for the side-fills. There are many wedges that sound very good run passively on a single amp channel. My favorite is the EAW SM200, which can also be switched to bi-amp operation, and is a staple of many performing arts centers. Another favorite is the Turbosound TXD-12M passive-only floor monitor. Self-Powered Like all self-powered loudspeakers, self-powered floor monitors provide advantages and challenges. After the missing amplifier rack, the great advantage is that, as a closed system, the combination of drivers, processing and power in a single product provides extremely consistent results. The Meyer Sound MJF-212 offers the option of a VEAM multi-pin that puts AC power, audio and RMS data into a single connection The accompanying challenge is that instead of a loudspeaker cable, each wedge must be supplied with its own signal from the monitor console and its own AC from a power distro. Solutions involving Edison-to-PowerCon cables with XLR stingers taped onto them, distributed from AC quad-boxes and male XLR fan-outs or sub-snakes are a common solution. Meyer Sound provides a VEAM multi-pin option for most of their self-powered products that puts AC power, audio and RMS data into a single connection, and the company’s recent self-powered MJF-212 employs dual 12-inch woofers and a 40-degree conical horn to minimize interaction with adjacent monitor mixes. Read the rest of this post 1 2 3 4 About Mark Mark Frink Independent Sound Engineer Mark Frink is a touring sound engineer who has mixed monitors for numerous top artists. Comments Have something to say about this PSW content? Leave a comment! Cancel reply Scroll past the ”Post Comment” button below to view any existing comments. Your email address will not be published. Required fields are marked *Comment Name * Email * Website This site uses Akismet to reduce spam. Learn how your comment data is processed. Tagged with: Engineer Loudspeaker World Mark Frink Monitors Sound Reinforcement · all topics Subscribe to Live Sound International Subscribe to Live Sound International magazine. Stay up-to-date, get the latest pro audio news, products and resources each month with Live Sound.