The Cerwin Vega CLS215 got nice reviews from Soundstage, and quite surprisingly, Robert E. Greene. Plus, you'll come in way under budget.
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Used Dynaudio 70s (like I have), 80s, 72s or 82s. Great speakers for loud music. They won't tire you out, the midrange is beautiful and the bass is deep. I am not selling any speakers and I have no relationship with the seller but I just noticed that there is a pair of 72s and the asking price is $895.
One tech reason the OHMs are a good choice for this is that they crossover to tweeter very high at 7khz or so and do not put much demand on the tweeter as a result. Plus the main full range Walsh driver never seems to show any stress at any volume. That is true of even original Walsh 2s from the 80s' that can often be had used these days for just a couple hundred dollars. Just make sure whatever you buy used especially if older is in good condition.
The reviews that showed up both in Soundstage and Absolute Sound indicate that the bass in the CV CLS-215 speaker is reasonably quick, or at least not notably slow or thick. They *do* tend to have diecast frames and very powerful magnets, which helps. TAS also praised them for overall neutrality and for providing the bottom end to do Mahler justice for the price of a decent minimonitor. They also verified that they can play LOUD distortion free, and with a 90+ dB sensitivity rating, can safely absorb 500 watts input. That's a usable max. SPL somewhere around 120dB.
If you want faster bass at the OP's max budget, then CV's new CMX-212a towers give you twin 8" woofers on a narrow baffle, augmented by powered side-firing 12" subs. No doubt that would tighten the bass significantly.
Frat-boy speakers were most likely powered by a frat-boy receiver--some over-sized walnut-encased monstrosity with more knobs than you could count, with a marginal power supply and low damping factor.
These days, inexpensive high current separates and integrateds are all over the place. Witness this 125 wpc Emotiva power amp on sale for $314.10 with a damping factor of >500!
Audio Physic Sparks:
Looks like Peerless 6.5's in a 2.5 way with a 1" Vifa silk dome. One way to go is to "upgrade" to the Vifa Dual Ring Radiator" which have a higher wattage rating. Except for the 5 screws, instead of 4, might "plug in". Problem is that Vifa offers many verions of nearly identical looking tweeters that vary in impedance, range and power handling. Change the impedance and the crossover won't work as planned. Any model #'s for the tweeters?
If you want more bass and dynamics as well... go bigger. The Sparks do quite well for their size.