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Efficient bookshelf speakers for my office

Hi everyone,

I'm thinking of putting together a simple office system with the Coincident Dynamo II and a pair of standmount speakers.  The Dynamo puts out 8 wpc, so I need a pretty efficient pair of speakers.  Only looking for bass down to 45HZ or so.  Tower speakers won't work due to the office setup.  Will sometimes crank it up a bit, but generally looking at listening at 75db or so.  Would welcome any recommendations.  Prefer a smoother, warmer speaker to a hyper-detailed one. 

Thanks for any advice you can offer.

Best, Scott
smrex13
erik_squires
5,268 posts
 
How efficient? I just posted a free design for a 91 dB single driver which can fit in a very small space.

https://speakermakersjourney.blogspot.com/2017/08/introducing-lm-1s.html

I should mention, the design is free, I'm not making money except to get people interested in DIY.

Best,

E
soix
2,133 posts
 
@auxinput - as you undoubtedly know, sensitivity is only part of the equation.  The JA RM7s impedance does not dip below 6 ohms at any frequency and has relatively benign phase angles so may work fine with lower powered tube designs depending on the amp, your room, listening volume, etc.  If the RM7s look interesting to you I'd call Coincident to see what they say as they'd know better than anyone what speakers would be suitable for their amp.  Best of luck in your search. 

tls49's avatar
tls49
1,318 posts
 

Sorry soix, I must agree with auxinput. Rated sensitivity of the JA RM7 is 86db, however it was measured at 84.5db. That alone makes it unsuitable for a low powered tube amp. The other characteristics are irrelevant. With 8 watts, I would only recommend a sensitivity in the mid 90’s or above.

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