Hi vintageman,
RE: your post of 4-21-2010 Nova 8b crossover;
I know I am replying to an old post but for some reason (being a new member I suspect) I cannot contact you directly. Anyway, I have a pair of Nova-8b's that were gifted to me by my 86 year old aunt. These had not been used in 20 years and cabinets are pristine. I'm almost 58 so I knew what she was giving me, I used to be quite the audiophile. At first I had them hooked up to a Onkyo 904, supposedly 60 wpc) but that Onkyo just did not seem to have the guts to do what I knew these 8b's could do. Back in the early to mid 70's RS made some fine equipment. So I found and purchased an old Carver M500t and a HK AVR-20 to use as the pre-amp. WOW!! After a couple of hours of pushing them, THESE OLD NOVA 8b's CAME ALIVE! Now even at lower volume levels they sound full range and pretty darn sweet with articulate highs and full bass. However, the left speaker sounds a little muddy in the bass to midrange and the right either has a bad mid driver or something wrong with the crossover. I can hear it crackeling/crapping out at certain frequencys and especaially at high volume levels. I'm very interested in the crossover design you mentioned in your post of 4-21-2010.
Thanks, RS
AM & FM radio DJ 1973-1976, USAF Machinist 76-80, Industrial Electrician/Controls Integrator 80-2011, retired to the green hills of rural Eastern Oklahoma, Hay farmer and sustainable living advocate.
Living room system:
Marantz SR5004, Fluance XTHTB 5 speakers, HSU VTF-1 subwoofer, Dish VIP 722 HD+ PVR, Aver Media C283 HD video recorder, Visio Super Blue-Ray, Custom built Media PC Win7 Ultimate AMD dual core 3.06GHZ black, 4GB DDR 1066, 2 BR burner drives, 4GB ram, 2 2TB internal HDD's and 2 2TB external HDD's all networked, Radeon ICE-Q 4670 HDMI IGB native RAM, LG 47LD450 TV.
Master Bedroom system:
Harmon Kardon AVR-20, Technics HS8020 graphic equalizer, Carver M500t power amp, 2 Realistic Nova-8b's, Phillips DVR 3576h HDMI HDD burner/player, TEAC W-520 R dual cassette. (Really want a TEAC 3340S reel to real that I had to sell when I TDY'd back to the USA in 1978)
These are the single best pair of vintage speakers that you can get! All the original drivers are very good and any short coming is in the crossover design. If you still have all the original drivers I have a new crossover design that will bring the nova 8b's to a level that very few, even current speakers can out perform. The standard crossover operates the mids and high drivers all the way to 20Khz and causes a lot of lobing between the drivers. The first order also increase destortion and decreases the power handling. The new crossover design will correct these issues. The speaker as RS designed it rolls off at 50Hz not the 20Hz in the specs. The new crossover is designed for the units to be on the floor and will give very smooth low frequency down to right at 30Hz. It also will tighten the windows to about +/- 3db from 30Hz to 20Khz. I will be glad to share more information if anyone is interested.