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Dave,Great point of course. Manufacturers state stuff like "nominal 8 ohm impedance." What in the world does that mean? Nuts. The fact is, unless the speaker is measured by Sphile, Soundstage!, etc...you will not know. Most manufacturers don't reveal it. I measure all my speakers for both impedance and phase which gives me an extraordinary amount of information and suggestions for amplifier compatibility as phase angle and impedance are both important as is sensitivity over a given frequency range. In other words, I don't care if a speaker is 2 ohms at 20 Hz or 20khz but I do care about the impedance and phase curve over the region where most music is played, i.e. 40Hz to 10khz. With the Tekton Double Impact Monitor measurements you have posted, a typical SET amplifier will sound excessively forward in the upper midrange (due to the high impedance), and lacking in the lower midrange and upper midbass. The frequency response curve will most definitely be affected in that range if using an SET to drive that speaker. But honestly dave, most folks don't care about those details. Best,Anand.
Yeah, I've just recently had an illuminating experience along these lines with my Zu Omen Dirty Weekends. Zu started offering resistors for sale to place across the binding posts to bring more uniformity to the impedance curve. This led me to look into the impedance curve for the first time, and found this:So while Zu gives the characteristic impedance, I thought I'd calculate the high and low impedances by hand based on that Superfly graph, since the main driver in the DW's is pretty much the same as the Superfly, with different cabinet loading. I ended up going with two 25 ohm resistors, which my my calculations brought the high impedance down from 45 ohms to around 9 ohms. And the low impedance only dropped to around 4 ohms. So, a 4-9 ohm range from a 7-44 ohm range. But most crucially, it muted that gradually rising impedance from midbass to upper midrange by quite a lot. And sure enough, the speakers don't sound nearly as uptight and constricted on my 845 SET amp, which would be the effect of a frequency response imbalance toward the upper midrange, but now have opened up and breathe nicely. I used to need to use a solid state amp with these speakers to get a satisfying presentation. No longer.
There are certainly some (speakers with crossovers) that get the impedance flat… which is the key for any speaker used with any amp that has a hihish output impedance (most SETs) which is way more important than (often over-) rated efficiency.
Which brings up a very relevant question: shouldn't the designers of said speaker have figured this out (and addressed it) prior to releasing this for sale? I wonder what happened to the concept of releasing a speaker when it is truly ready for prime-time, not before. -dGB
Bingo. Which is why I am keeping my current speakers!
If anyone wants to hear this tweeter array let me know. I use the Impact Monitors with a pair of Rythmik subs. I’m in Charlotte, NC.
I think there is no SET friendly speaker with xover, they are awful.
Would it be better to have a SET amp for your main driver, then a separate amp/woofer to handle the lows..?V...
I believe most music lovers will like this approach.
...... Tekton's policy of a 60 day free trial is quite generous and uncommon in the audio industry.
