![]() The result is unusually smooth response down through the range where all other speakers exhibit some sort of resonance, but the amount of bass boost necessary to carry the speakers below 40Hz is quite substantial, and puts rather extreme demands on the output capabilities of the amplifier, as well as on the capacities of the speakers. Bose approached the problem of the inescapable bass resonance in speakers by moving this up in frequency (to around 200Hz) and applying equalization to offset the normal 6dB/octave rolloff below resonance. And we are not convinced that this can yield as good performance as is obtainable from a system that needs little correctional boost or none at all.įig.3 Response curves (from one of Bose's blurbs for the 901) show the wide range of equalization contours available from the speaker's active equalizer.ĭr. The equalizer that is part of the 901 system offers a selection of response curves via several front-panel switches (fig.3), but even in the operating mode that is identified as having the flattest response, the speakers themselves are being fed rather substantial amounts of bass and treble boost. What bothers us about the 901, though, is the amountof compensatory boost that has been used, rather than the fact that it is used at all. Equalization of this kind is fine, of course, if only a small amount is needed to add the last nth degree of perfection (?) to a system, and if the loudspeakers can take it without swapping extended range for increased distortion. One of these is the use of electrical equalization to compensate for deficiencies in the speakers at the high and low ends of the audio range. As good as any live performance you can imagine even better.There are two other things about the design of the 901 that we question, too. The power handling of these speakers are phenom. Lastly, I installed a Sunfire woofer in the mix and I used a Litespeed power conditioner to finish things off. I also incorporated a Marantz AC3 digital processor for my Rotel CD player and 32bit computer driven MP3's. I powered the speakers with a 200 watt per channel Chiro amplifier and Mcintosh preamp. I used 8 gauge OFC twisted pair with platinum connectors on both ends. I went through great pains to make sure placement was optimal, but I also concentrated my efforts on the cable and power plants as well. Deep sharp bass response, great highs and middles that can make you weep. Walk around the sound stage and be amazed. Once the speakers land in the 'g' spot (groove) they will come alive and consume the room with high fidelity like no other. Simply following the guidelines in the manual is a good start, but all rooms have different sound dynamics so location refinement is essential to optimal listening. The 901's are somewhat different because speaker placement is critical. Rock, Jazz, R&B all sound fabulous with classical and opera sounding amazing. The speakers handle as little as 30 watts and I have driven them hard with 120watts per channel. The 601s work on the same theory as the 901s - direct reflected sound. I still have them and they still sound great after 30 years although I did replace the bass drivers (due to foam rot). My first set of Bose were the 601 series one. These speakers have been around for years and not much has changed in its conceptual design. ![]()
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