We've sold a few E28s and they work well for this purpose. The two units to look at if you are interested in this approach would be the ExaSound E28 and maybe the new Merging NADAC. Most multi-channel DACS are not particularly user friendly and don't have basic features like output muting when power is disconnected. The DAC feeds the left/right power amps and the subs. The volume control is best done in the DAC, unless you have a multi-channel pre-amp. Since you have split the left and right signals inside the computer you now need a multi-channel DAC to feed your system. Both have decent onboard crossover functionality that is sufficient to get good integration. This type of subwoofer crossover resides on a PC or Mac and is performed by playback software such as JRiver Media Center or Pure Music. These solutions are definitely more complex than the active analog crossovers discussed above, and to properly optimize all their feature you'll generally need the support of a knowledgeable dealer. Here's the Stereophile review of the PreMATE. They are best employed as the nerve center of your system, fed with a digital source and feeding a power amplifier. The DEQX processors like the HDP-4 and PreMATE are fully featured digital pre-amps with onboard DACs that include speaker / room correction. We like the products from DEQX and Trinnov, both of which provide functionality far beyond simple sub crossovers. These devices work in the digital domain (therefore digitize all incoming signals) and provide significant flexibility in setting up crossover point and slope. Here's a good review of the JL Audio CR-1 at Ultra Audio. The JL is comprehensive enough to allow integration into a home theater system, can sum left and right to mono internally, and is relatively easy to set up (assuming you have an acoustic measurement system like the XTZ Room Analyzer II and some knowledge). They are perfect for a reference quality system or if you are wary of digitizing the output of your turntable. These crossovers let you choose the frequency and slope for the crossover and have great sound quality. This is a device that goes into your signal path between pre and power amp, or in a tape loop in your integrated. With all that said, here are three ways you can integrate subs! Increasing low frequency extension, giving you a "full range playback system", in our opinion very important for truly enjoying everything that is on a recording.Smoothing the frequency response and reducing modal resonances, due to room mode cancellation effects from multiple subwoofers.Reducing distortion, since your amps and speakers work less hard as the sub takes the load.Running speakers full range with subs coming in underneath limits your choice of crossover point for the subs, and if your speakers are ported can result in severe integration challenges due to phase cancellation around the crossover point.Īctively rolling off the bass to your main speakers will improve sound quality by: We're advocates of actively rolling off the bass to your speakers, combining the left and right signals to mono, and feeding to one, or preferably multiple subwoofers. We do not believe in running your speakers "full range", bringing the sub in where the speakers roll off, though if you really want to do that then see our article on how to do it. There are many ways to integrate subs into your two channel system. Three ways to add a subwoofer crossover to your two channel system
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