Originally Posted by darrellh44
Thanks for the feedback. I'm also thinking about doing what you did where you kept the passive crossovers in place and just used electronic eq to smooth the overall speaker's magnitude and phase response. In my case I'm using ARC in my Anthem AVR to fix room problems, but I try to limit the max EQ frequency to just fix the modal problems. For now I'm correcting up to 1500 Hz since the room/speaker anomalies that ARC sees between 500 Hz and 1500 Hz in general match Danley's published anechoic response. What I would really like to do in the short-term is measure each my speakers' anechoic response outdoors, and then use electronic eq to only fix the SM60Fs' anechoic response and phase. I would then allow ARC to correct the room and the pre-EQ'd speakers, but only below 400 Hz or so.
Depending on how that goes, I would then look into doing a true active crossover implementation with the same goals. But I was under the impression the SM60Fs were 2-way and not 3-way. If they are 3-way, that does change my DSP options a bit. The ADC/DACs in the miniDSP HD products seem to have a good reputation as far as SQ, so I would like to use them.
I have never used tube amps, but I'm curious about them. My boss is currently building a DIY 300B tube amp and has planted a bug in my ear. One of the things that concerns me about tube amps is their high output impedance. Apparently this has some sonic advantages in how they 'soften' transient interactions between and within the speaker's drivers and crossover components. But most Danley speakers have very irregular and fast changing impedance curves with dips to 3 ohms, so it seems tube amps would have have problems driving this type of load.
Yes, the SM60F is actually 3-way: they use a coaxial 2-driver compression horn (Tweeter + Mid), in addition to the 2x 8" Low-freq drivers. When you look down at the compression horn, you'll see a center hole (where the HF comes out), plus 4x holes surrounding it which are for the mid. Then, the bass holes are midway down the mouth of the Synergy Horn. Finally, are the bass-reflex breathing ports, are further towards the front.
That said, I use the speakers at relatively quiet volumes - my tube amp is only 7Watts!
So, there's plenty of headroom to EQ the bejeezus out of the bass to get another 10~20Hz of LF extension. That said, I actually don't miss it *that* much playing them flat... I'm more of a midrange-snob than basshead (hence me running tubes). The Danley's are so $#@! efficient that I pretty much *never* turn my amp up over 50%... amazing. Similarly, the amp delivers huge *current*, so the impedance variance is negligible; transformers & power supply are everything for tube amps - not a place to skimp.
300B is a magical creature if you can work it right... different signature than other tubes, and so yummy/floaty in the midrange. I use a Sophia Electric amp that I was lucky enough to get used at less than 1/2-price - always look for the bargains! (www.sophiaelectric.com
) They really know their stuff in re-creating the magic of the old Western Electric sound, while simultaneously extending the freq range. I believe they've got great sounding 'baby' amps. They also make their own tubes (!!) and apparently their highest-end models ('Royal Princess') are heralded by many snobs as one of the best ever created. Wish I cld afford...
Final note: The Danley's are actually resolving enough that you really can hear blatant differences in speaker wire quality. Really. Wire is one of the biggest scams in the audiophile world, but cable dielectrics definitely affect the transient response. Anti-Cables (http://anticables.com
) is a cable I found that creates solid-wire cables with almost zero dielectric loss at a reasonable price. I've got 2 degrees in electrical engineering, so I never put much stock in cables. But when I got a set, I couldn't believe my ears on the difference it made. Same w/ their Power Cords. It was like a whole new rig.
OK. The 2-channel tube guy better quit spamming the A/V forum w/ all his audiophile gobbledygook before he gets lynched!!