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4000 rear channels sound lousy
oldmakoOffline
#1 Posted: Monday, June 6, 2011 1:44:16 PM(UTC)
 
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oldmako

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I just picked up a mint 400 to complement my original.  When I hook both of them to my 4000, the sound seems muddled a bit on the rears.  With the stick in the center, everything sound great, but when biased toward the rears only the sound is a bit flat and sounds almost like the speaks are out of phase or wired up wrong.  I have triple checked the wiring.
 
If I swap amp/preamp leads  the problem follows to the front channel.
 
Any guesses?
Two Phase Linear 400s, 4000 Preamp and 5000 Tuner
Klipsch CF3s, Fortes, KG3.5s, KSF 10.5s KSF S5s, Tangents, SB1s, Advents
Pioneer SA9100 amp, SA8100amp, TX 9100 tuner
Sansui 9090DB, G-5700, B1000 and B3000, Denon TT, Marantz ST6000 Tuner, 2 Beater Sony CDs
Misc other old SS junk. Bad Hearing.
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oldmakoOffline
#2 Posted: Tuesday, June 7, 2011 9:42:35 PM(UTC)
 
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oldmako

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I noticed that there is a third set of output jacks on the back of the preamp labeled AUX. I moved the leads from the LR and RR to the AUX outputs. Guess what? The rears now sound great! But, as one would expect the balance / fader stick is essentially inop. It will decrease the volume of the fronts, but in no way affects the rears in this AUX posn.
Two Phase Linear 400s, 4000 Preamp and 5000 Tuner
Klipsch CF3s, Fortes, KG3.5s, KSF 10.5s KSF S5s, Tangents, SB1s, Advents
Pioneer SA9100 amp, SA8100amp, TX 9100 tuner
Sansui 9090DB, G-5700, B1000 and B3000, Denon TT, Marantz ST6000 Tuner, 2 Beater Sony CDs
Misc other old SS junk. Bad Hearing.
BuddhaBobOffline
#3 Posted: Friday, June 15, 2012 12:36:27 PM(UTC)
 
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Oldmako,
Still using the 4000 in 2-channel mode? THat's how I use it. The SQ section is noisy and I'd rather have good 2-channel stereo than noisy/squirrelly rear channel sound behind me. The 4000 Service Manual mentions noiser output in 4-channel mode (although the owner's manual mentions keeping it in 4-channel mode all the time since there are often interesting effects heard from stereo recordings decoded in 4 channel due to microphone placement, etc.).

I know this post is a year old, but I see lots of 4000s traded on eBay and wondered if you or anyone else here had ideas to mod the 4 channel board.

Currently listening to: Dynaco 400, Sony TA-N220, Phase Linear 4000, Yamaha T7, Nakamichi C3A, Teac A-2300SD, Sony MXD-D400 (MD/CD), Empire 598-II w/A-T 311EP, Koss CM1030s, Klipsch VP35s.
In the wings: Dynaco 400 (#2), Dynaco 120, Phase Linear 1000, Yamaha C45Nakamichi B300, Technics RS-M63, DBX 3BX-II, DBX 224, Teac A-3440, Akai GX-77, Tascam 32, Teac X-2000M.
jvandyke_texasOffline
#4 Posted: Saturday, June 16, 2012 3:54:01 PM(UTC)
 
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When I was in college, I designed my own version of the sonic hologram with plans to put it in my PL4000 as a swap out for the SQ board.  The joystick would control the injection ratio.  The design was similar to the first generation SH A revision before Carver started using the Pade approximation for the delay elements.
The prototype sounded very good.  I never finished soldering the board up that would fit in the preamp.
 
The C9 SH board will not fit in the PL4000.
 
 
1 user thanked jvandyke_texas for this useful post.
BuddhaBob on 6/16/2012(UTC)
BuddhaBobOffline
#6 Posted: Saturday, June 16, 2012 7:33:12 PM(UTC)
 
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That sounds very cool. What a great idea. That joystick *should* have a better use than just being centered all the time! What audio gear has a joystick then OR now? Looks pretty impressive, but even more impressive would be if it had a regular use, as you had planned. I'd sure like to figure a way to take my 1000 innards, add them into the 4000, and have a true 4 channel preamp. It would be a real lash- up though.
Currently listening to: Dynaco 400, Sony TA-N220, Phase Linear 4000, Yamaha T7, Nakamichi C3A, Teac A-2300SD, Sony MXD-D400 (MD/CD), Empire 598-II w/A-T 311EP, Koss CM1030s, Klipsch VP35s.
In the wings: Dynaco 400 (#2), Dynaco 120, Phase Linear 1000, Yamaha C45Nakamichi B300, Technics RS-M63, DBX 3BX-II, DBX 224, Teac A-3440, Akai GX-77, Tascam 32, Teac X-2000M.
zumbiniOffline
#7 Posted: Saturday, June 16, 2012 8:18:40 PM(UTC)
 
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BuddhaBob;96185 wrote:
.....What audio gear has a joystick then OR now?....
 
Joysticks were pretty common during the short-lived days of quad. Check out these Fisher and JVC receivers:
 
 
Main System
Carver Gear: C-11 (BillD-modified, w/balanced outs), M-500 (refit by BillD), M-500t(x2) (refit by BillD), M-1.0t (MK2/opt2), SD/A 490t, TX-11b
Other Electronics: Behringer Super-X Pro CX3400, Behringer Ultragraph FBQ3102, Furman PS-8R-II, Nikko NPS-1, Teac C-3RX, Technics SL-D303
Speakers: Legacy Audio Custom Super Satellites (new drivers and biamp-able XOs 2010), Legacy Audio Custom Subwoofers (reconed 2010)

Mini Carver Office System: C-2 (modified by BillD, w/balanced outs), DTL-50, M-200t, TX-2, Musical Fidelity X-10D, Design Acoustics DA-30 (DA-20LF sub w/4 DA-10 satellites, sub reconed 2000)

Workshop System: MXR-130 Receiver, DTL-50 CDP, Design Acoustics DA-30 (DA-20LF sub w/2 DA-10 satellites, sub reconed 2010)

Son's System: CT-Seven, DTL-200 MKII, M-1.5t (DIY recap 2011), Hitachi PS-38 (TT), Klipsch KG2.5 speakers, PSB Century Subsonic 2i powered sub

Band PA System: Aphex 124A, Behringer PMP3000 and DCX2496, Carver PM-1200(x2), Seismic Audio FL-155P(mains)/PWS-15(fill)/SA-15(monitors)

Not In Use or Need Repair: Denon DCM-35 (CDC), Teac X10R (RTR), Technics SL-1200MK1 (TT), Yamaha CDX-820 (CDP)

weitrhino wrote:
1 user thanked zumbini for this useful post.
BuddhaBob on 6/16/2012(UTC)
TNRabbitOffline
#5 Posted: Sunday, June 17, 2012 4:13:07 AM(UTC)
 
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jvandyke_texas;96177 wrote:
When I was in college, I designed my own version of the sonic hologram with plans to put it in my PL4000 as a swap out for the SQ board.  The joystick would control the injection ratio.  The design was similar to the first generation SH A revision before Carver started using the Pade approximation for the delay elements.
The prototype sounded very good.  I never finished soldering the board up that would fit in the preamp.
 
The C9 SH board will not fit in the PL4000.
 
Didn't know you were still around, James~
 
Found these pics of your 4000 from CarverFest 2008:
 
 
 
Is this yours, too?  EDIT:  Looks like it might be RobertR's.....that looks like his trinaural setup~
 
 
Who's is this?
 
 
 
 
 
 
 
 
TNRabbit

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galaxyoilcanOffline
#8 Posted: Sunday, June 17, 2012 6:36:39 AM(UTC)
 
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These 4000's are fantastic. The mods make them look like someone sneezed emeralds in them. I can remember lusting after one of these 4000's when I was a youngster early in my Air Force career. Several years later I was lucky enough to get a deal on my Carver gear when the base exchange system (AAFES) decided to stop carrying such high-end audio gear. I got it all for 50% off the already marked down red tag price. I still couldn't afford to do a cash and carry deal, but they had a six month lay away program that I used all of before I could finally take my treasures home.
 
I really love and admire the ideas I see here to mod the 4000 SH and rear channels.
 
 
The beatings will continue until morale improves!

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