The front high tweeter can go to the 3/4" metal dome tweeter. The Low Tweeter can go to the new 2" metal dome. The 8" mid-woofer can get a new cone with a smoother transition to the low tweeter. The 12" sub-woofer can get a SubBass Activator and vent adapter to extend the bass below 28 Hz. In order to use the bi-amping feature, it is necessary to have an external electronic crossover, which exists in most home theater system receivers. This feature can be overridden by means of a toggle switch on the input plate to make all the drivers work on one amplifier. The Ohm I features a bi-amplifiable design, with separate inputs for the subwoofer channel and all the rest of the drivers. On the front of the cabinet is another 1” high tweeter to extend the treble. Also on top of the cabinet is a 1.5” low tweeter and a 1” high tweeter. This driver is mounted on the top of the cabinet and has 360 degree dispersion. The speaker can handle 1500 watts on most systems! In addition to the 12” sub-woofer, there is a vented 8” woofer/ mid-range that operates from 100 Hz to 1700 Hz. Designed in the late 1970s (before most people had heard of sub-woofers!), it held Ohm’s record for highest output head room until the development of the Walsh F-5015 in 2013. Perhaps I should sell that amp and get some active monitors.The Ohm I is a 4- way system with a built-in sub-woofer in each cabinet. I see the Tannoys I was looking at are 6 ohm. I intended to get the NS10's but learned they have been discontinued (figure that out, why?) The only pair they had were the demos which had the center punched in. I think I might just return them and get something a little better. I don't even have these Alesis monitors out of the box yet. But I'm really just talking out of my arse here and don't know what I'm talking about. Because it is a much bigger amp then I need to power studio monitors I thought I might fry it at the lower resistance even at lower output levels. So, it is a pro amp, it's just really old. It is an 8 space rack mount and weighs about 40lbs. It is a good beefy clean amp, It says 230 watts a side max 8 ohms. I bought this Yamaha P2201 solid state amp used about 15 years ago. This was intended to be a temporary solution until I can afford the Mackie Active monitors that I really want. Thanks a lot John, You have been a huge help. Particularly in lower priced monitoring setups. This eliminates the above problem, if it exists for you, and provides some other benefits which much has been written about. If it's not a top quality piece tonally, and you're unhappy with the results with your new Alesis speakers with it, consider one of the several good active monitors available. I'm ignorant of the Yamaha amp you mention. Impedance matching of vacuum tube power amps is a different matter in total. Incidenatally, well designed and built solid state amps can drive 1 ohm loads, wide open, all day long. As you know many specifications for solid state amp gear are just guidelines, and often tell little of true sonic performance. If it will run for an hour at your intended volume, will full bandwidth program, and sound OK to you, then you're OK. If the unit simply shuts down, you have your answer. As you increase the volume to your normal listening level, monitor the temperature of the amp housing, and listen for distress. I suggest you audition your Yamaha amp with your 4 ohm monitors, at a conservative volume, and let your ears be the judge. The rating of your piece at 8 to 16 ohms makes me wonder if was a lower end consumer unit. Better modern solid state amps, though, will easily tolerate 2 and 4 ohm loads, and will in fact develop much more power into those loads than they will at 8 ohms. If disortion is marked, speaker could be endangered, but usually amps have output-disconnect devices in that degree of distress. In particiular, lower load impedances like 2 ohms will be intolerable for the amp at higher volumes, as the unit won't tolerate the current drain, and thermal overload or even output transistor/power supply damage may result. When a manufacturer rates a solid state power amp as accommodating load values no lower than 8 ohms, they may be stating that the units specifications deteriorate when the unit is loaded at 4 or 2 ohms.
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