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I'm about to receive a pair of the Eminent Technology LFT-8b speakers, and am wondering if the RM-200 amp would be appropriate for driving them. The details I should include are that the speaker is a magnetic planar-cone woofer hybrid, with a symmetrical 1st-order x/o at 180Hz between the midrange panel and the cone woofer, and also between the mid-panel and the tweeter at 10K. Bruce Thigpen rates the speaker as an 8 Ohm load, with the panel alone being a 12 Ohm one. I mention that because I'm going to use the panels but not the cone woofer (they are both connected to the x/o on a barrier strip, and can be used independently), therefore the RM-200 will be seeing a mostly-resistive 12 Ohm load. In addition, the speaker is very low sensitivity, 84dB. In view of all the above, is the RM-200 a sensible amp for this speaker in a 10 X 13 X 19 room, playing a lot, but not all, acoustic instrument music (Baroque, Singer-Songwriter, Bluegrass)? I'd love to hear from Roger on this, but anyone else as well!
No, it's 100W/ch, approximately. Where did you here the ET speakers, if I may ask?
At an audio club member's house in Houston, TX in his dedicated listening room.
Well Roger and anyone interested, I'll let you know how well they work together, 'cause I went ahead and nabbed the MR-200 while the nabbin' was good, used on Audiogon. It's the original version, not the Mk.II. I'm more of a music lover than audiophile (sure, that's what they all say), so the difference between the two versions doesn't bother me. I'm sure either will have satisfied me. But out of curiosity (so much for the previous disclaimer!), how much and what kind of difference is there between the two? I mean, just in case I want to get another and run them bridged. They can be run that way, right? Say, how do I subscribe to the Music Reference thread on AudioCircle, so that I get notified of responses to my postings? Thanks all.
One thing about paralleling tube amps is that they need a speaker of half the impedance of the tap value to get the full power. Thus a 8 ohm paralleled amp needs a 4 ohm speaker to get the full stated power.
And the amp will then be an RM200Mk.II-T?
Tube amps in general cannot be bridged. That honor applies to transistor amps. However tube amps can be paralleled for mono operation but that is a tricky business. I did a very good mono switch on the RM-10. One thing about paralleling tube amps is that they need a speaker of half the impedance of the tap value to get the full power. Thus a 8 ohm paralleled amp needs a 4 ohm speaker to get the full stated power.
Besides providing the extra watts, will running the RM10 in mono mode (using a 4ohm speaker on the 8 ohm tap) further improve its performance in the low frequencies?
Paralleling channels does not change frequency response but the extra power and lower impedance will sound different with speakers with varying impedance as the damping is increased. The way to look at it is that the voltage stays the same but the current doubles on any particular tap. That is why the 8 ohm tap is loaded at 4 ohms to get the double power. On the 8 ohm tap the power is increased by about 1.4 times.
ThanksThe origin of my question stemmed from a recent opportunity to listen to the RM200MkII side by side my RM10MkIITwo aspects of the sound from the RM200 consistently stood out – better low frequency presence/ definition and overall it sounded louder, I guess maybe due to wider bandwidth, more watts and more current. The playing louder is not that important to meHaving said that, I must say I preferred the overall tone of my RM10! It’s a fine amp no doubt but if I could extract more LF that would be an added bonus.I now understand that the frequency response of the RM10 does not change in mono mode. The question in my mind is – Is it logical to think that using a pair of RM10s in mono mode might help to bridge the gap in the LF performance between the two models (for the reasons Roger articulated)? I say bridge the gap since I assume the wider bandwidth of the RM200 transformers will always give it an edge.Or does that not make engineering sense and I am getting greedy and perhaps should just drop it and enjoy the RM10 as is – which is great, just so no one misunderstands.- I listen around 75-80db (measured 1m from one of the speakers), maybe once in a while 85dB- Speakers are bookshelf @ 4ohms which are supposed to have benign impedance and phase curves across ~80Hz-8kHz. Currently speakers are connected to the 4ohm tap of the RM10Thoughts/suggestions appreciated
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