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Old 21st April 2013, 09:12 AM   #11
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Location: Oceanside, CA
OK just to bore everyone again!

My Muti turntable (3), Cassette, analog playback (Nakamichi single CD/Sony MD/Philips CD/CDrecorder) running thru muti-preamps with a (volume stepped attenuator final passive control switching unit)feeding two separate Hi/Low signal SAE para EQ/31 band Nady Pro-EQ to lndividual SAE Xover/Nady Pro-Xover then Hi/Low signals Bi-amped.
Primary turntable Yamaha PX3 linear tonearm with HiFi AK(handbuilt) mid gain/MC cartridge, via hybrid/tubed dedicated Jolida MK II phono line stage, with the other mentioned source units directed thru two separate preamps all switched controlled from the above mentioned custom passive control unit with the signals being split to the SAE EQ/Xover (Hi-side) and to the 2nd tier 31 band 1/3 octave Pro EQ/ProXover(Low-side)units.
Split stereo signals are then bi-amped from Hi/Low feeds (Counterpoint Tubed Hybrid/NAD2200 solidstate “commutating” 2 channel amps) into what amount’s to bi-wired (L/R) 16 driver speaker towers. Utilizing a set of Yamaha NR500 large 3-way bookshelfs positioned on top of the Sansui (old school)4-way bookshelf speakers working together as one left tower/one right tower system. 1st tier 105watts (Counterpoint Hi-side) signals delivered to the Sansui 5 speaker portion and the 2nd tier 140 watts (NAD 2200 Low-side) signals going to the Yamaha 3-ways with nice carbon fiber 12” woofers plus an additional mono 8”Klipsch slotted subwoofer driven via a (300watts peak), Carver Ma202, bridged LF control power amp. I E (65 Hz and below so as not to load up the Yamaha L/R speaker set with these important lowest freq. signals). Note stereo LF subs would be preferred but I’m completely out of space in this current single listening room environment.
There’s also a full 7.1 Yamaha AVR with a Sony BD/SACD and Sony (5 disk changer)present in this same entertainment space sharing the front tower speakers with a KEF iQ6 center Bi-amped (Rotel 960BX/Kenwood), with three sets of rear surround speakers (Nakamichi, Yamaha & Advent mini towers) run on a separate Kenwood 6 channel amp plus it’s own 1200watt Definative Tech SC4000 dedicated subwoofer for entertaining separately…
I E: This is an original setup developed by me in an attempt to solve several home entertainment/stereo sound quality conflicts. These tower units will be utilizing there 8 individual drivers per channel plus a single 8inch slotted sub. My dedicated music stereo reproduction sound system.
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Old 21st April 2013, 09:31 AM   #12
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Hi,
there's some over-processing of the signal and too many sound sources.
That's for sure !
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Old 25th April 2013, 08:11 AM   #13
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So general question: If there is only of a partial ability to have balanced XLR connections from the source signals but still RCAs connecting with the main amp, which side of a (Hi/Low) bi-amped freq. group would probably benefit more the Low side or the High side freq. grouping??
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Old 25th April 2013, 08:17 AM   #14
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INFO Only:

NAD 2200 “commutating” 2 Channel amp 140W @ 8Ω avg. THD 0.03%
In short this is “one hell of” a 2 channel stereo amp…

Believe it or not I am the current owner of a pair of these wonderful NAD 2200 amps. This one cost me $200.00 but worth three times that much. Check this out this amp was definitely upgraded by this previous owner. Boy this guy really hooked me up but I spent a total of $500.00, still for what I got it’s also a steal. Looks like I plan to only use this one; I just picked it up off an ebay seller who sold me the passive pre and tube buffer also. This amp will definitely be supporting my Bi-amp (low Freq.) Mid/Bass signals with the Yamaha NS 500’s operating at an avg. 6Ω loading factor.
With the single tube/buffer unit inline with this amp, now both the bi-amped units will have that warm tube touch… WOW Best buy ever if this run’s flawlessly… NAD 2200 upgraded+(tube buffer)/Counterpoint SA-12 with matching sets of NOS superior quality tubes. Would love to upgrade the RCAs and have both units pwr cords chg to plug-in upgraded (audio-quality) AC cables.
2nd NAD 2200: I absolutely stole this off Ebay for $175.00 delivered from Hawaii no less. However it is vintage in age & was up till recent just purchased as a unknown (storage auction) “fingers crossed” it’s in excellent mechanical shape with little prior heavy use. 4/24/2013 date of MNF for both units separate limited years of production on this model (1987/1989).
Review/Spec’s:
Reproducing musical signals, the NAD 2200 routinely delivers over 500 watts per channel into typical
nominal loudspeaker impedances. Working as a A class and then later a A/B class as power requirements go up.
http://imageshack.us/a/img685/4668/dsc01356.jpg

In actual measurement with speakers of complex impedance and lower-than-average sensitivity, the
2200 produces peak sound pressure levels exceeding 115 dB SPL(Sound Pressure Level) in a medium to
large room, with no audible or measurable distortion.


Counterpoint SA-12 Hybrid: The first impressive aspect of the SA-12's capabilities to materialise was its effortlessness with suitable speakers. While I mentioned that the SA-12 showed no strain driving either the Sonus Fabers or the Celestions -- neither of which work well with gutless amplifiers. Within this context, the SA-12 is an ideal choice for top-quality, small monitors, and it eliminates any craving for purchasing an overkill design.

The most revealing test for this characteristic is the way it amplifies delicate signals -- solo instruments for example -- to exceptionally high levels without losing any of its sparkle and without manifesting any traces of being overdriven. The SA-12 rose to the challenge. And remaining delicate and sweet-sounding at high levels is a virtue which shouldn't be underestimated.
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Old 25th April 2013, 08:32 AM   #15
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The second NAD 2200; Will someday support a stereo/summed 2nd subwoofer unit with LF control. When I have the space necessary to incorporate a good 12" or 15" passive box for ultra low freq. delivery... Say 20 hz to 40 hz.

Last edited by jeffjeremy; 25th April 2013 at 08:33 AM. Reason: update size
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Old 26th April 2013, 10:13 AM   #16
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Big changes today ZU Audio Union Loudspeaker in Honey Walnut (factory Demo). Factory 600 hr burn-in; 10' coaxial tower speaker set walnut veneer, award winning full range single axis focal image with Zu-Griewe box loading technology. There are no ports as used in a bass-reflex design (Helmholtz resonators in all their forms) but cabinet finger ports that see the acoustic space of the room and load the cabinets. These will be replacing the vintage Sanasui SP5500 mentioned earlier supporting the Hi side freq groupings. This is a major upgrade to the overall system continuity of stereo soundstage quality and instrument local focus.

P S the above mentioned low freq sub support should have quoted more like 30 hz to 55 hz

Last edited by jeffjeremy; 26th April 2013 at 10:19 AM. Reason: Just to be more exact...
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Old 29th April 2013, 06:42 PM   #17
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All these viewers and no one cares to make any comments??

That's my reason for listing this stuff I can Doc' this on my home computer I was look'in for outside comments.

Thks let me know what you think! LOL
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Old 5th May 2013, 06:04 AM   #18
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Bump

Still interested is any comments related to having one of these amps: I E Hi verses Low (main amp) modified to balanced XLR inputs.

So while taking into account that RCAs interconnects will be involved from the source signals, thru to the preamp, then at the EQ/Xover change to XLR cables and subsequently delivered via XLR to a modified main amp balanced XLR input.

Which side of a (Hi/Low) bi-amped freq. group would probably benefit more the Low side or the High side freq. grouping in modifying the amp to balanced XLR inputs?

I have no glue whether mod the amp inputs would achieve anything!!!
Not that Knowledgeable about this subject. Please consider commenting.

Thks
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Old 8th May 2013, 09:33 AM   #19
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Add to the above: I actually acquired a Tube Buffer unit and a second NAD 2200PE amp that was upgraded from this same individual on Ebay, as the previously mentioned passive preamp bottom of pg 2. One of the main reasons I went with this passive over others was the deal on the Buffer & amp. Very nice guy I can't wait till I can firer this system up! But alas still acquiring a third rack to stuff this get'up into a sm condo living room plus need a few things to still be delivered.

Also found someone out of Illinois, making some really great costume cables for very affordable prices and they also specialize in certain amp/equip. upgrades or repairs. will list contact info to anyone thru IM if requested.

Thks Jeff

Last edited by jeffjeremy; 8th May 2013 at 09:40 AM. Reason: added location of earlier comment.
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Old 22nd May 2013, 04:41 PM   #20
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Location: Oceanside, CA
BUMP:

Still work'in on initial configuration/setup have a major left leg injury and recovery is slow'in my progress considerably...

Still hopeful for input by anyone caring to discuss specifics or answer to issues brought up regarding this overly complex configuration. Still believe this will sound amazing due to the superior quality of most of the components.

Thks Jeff
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