MoFi Sourcepoint 8 or Q Acoustice Concept 50s

@dynamiclinearity The issue with the auditioning the Concept 50s is that they appear to have been discontinued and are going to be a challenge to find until they start appearing on the used market.

Op, Crutchfield has a scratch-and-dent pair available. They claim their S&D items are usually in decent condition. The holiday extended return period is already in effect.

Extremely high impedance peaks like that can often be well addressed by a high value resistor in parallel with the inputs

I hope you know what you are talking about here. A “high-value” parallel resistor — say, 100 Ω — won’t effectively flatten an impedance peak that high. The resulting impedance would still be around 43 Ω, based on 1/(1/75 + 1/100). That peak wouldn’t come close to the nominal impedance until a much lower value, such as 10 Ω, is used — which yields 1/(1/75 + 1/10) = 8.8 Ω.

Also, there is a downside of using a single parallel resistor, i.e., it affects the entire impedance spectrum, not just the peak. Even the region already near nominal impedance would drop — for example, 1/(1/8 + 1/10) = 4.4 Ω — effectively turning an easy-to-drive speaker into a more demanding one.

If the goal is to address only the impedance rise around 2 kHz (as MoFi did with the SP-10 ME), a more refined approach is required. I’d be happy to explain how that can be done if you could not figure that out, ’Engineer.’

@lanx0003 I contacted Crutchfield about the Concept 50 last month and the scratch and dent is actually  a single unit - the only one they have remaining.  There is also a dealer in the UK that has a single unit listed on Ebay.

So you’re on the hunt for a new pair of speakers and you’re down to a choice of two.  Suggest you buy both from a dealer or retailer that will let you buy and try and return one set for free or for a nominal fee.  A/B test them in your room with your equipment playing the music you love.  Keep the pair you like best and return the other.  The only way to know for sure and not have buyers remorse or FOMO in my experience.  Happy hunting!