Custom built FritzSpeakers.Com tower loudspeakers with 8 inch Seas Excel Magnesium mid/bass drivers and large HiVi ribbon tweeters. These have great low bass response down below 40 Hz. 88 dB sensitivity with Series crossovers. 40H x 10W x 10D They are very easy to drive even with low powered tube amps.
Check out the impedance & phase curves on these. Google any other loudspeaker & see if they have a Stereophile review & check out the impedance curves on the measurements page. Most name brand speakers impedance curves look like a mountain range with large peaks & dips. Loudspeakers with Series crossovers sound much better. Check out my web site for more info on why Series crossovers work better and to read 35 reviews on my other production models.
The speakers are still available if this ad is up.
For more info on this custom pair and to arrange a no obligation demo, please contact me here with your phone number, or go to my web site- FritzSpeakers.Com Thanks, Fritz Heiler
BTW- Series crossovers actually have variable crossover points. Conventional crossovers are basically mathematical equations that are separately calculated based on the impedance of the mid/bass driver and tweeter used in the speaker.
When music is playing through a loudspeaker, the drivers voice coils heat up and the impedance and other electrical parameters can change. A heated 8 ohm mid/bass driver coil may become 7 ohm, a 6 ohm tweeter coil may become 8 ohm (could be higher or lower depending on voltage & current), effectively changing the cross over frequencies of each driver. The mid/bass could now roll off sooner (lower) and the tweeter could come in later at a higher frequency... or vise versa. This can result in an overlap or suck out between them.
With series crossovers both of the drivers are in the same circuit and the crossover points fluctuate between the two drivers eliminating the peaks or suck outs of conventional crossovers.