Conrad Johnson / McCormack DNA-750 monoblocks. Are the amps I use. I don't think the sanders has enough output volts to fully drive them??? Not sure
unbalanced rca. Buying new rca's in week or two. Groneberg Quattro ref with wbt connectors |
The preamp does not have any capacitor in the output circuit. It has a very low output impedance of only 50 ohms, so it will drive an amplifier of extremely low impedance without any problems. What this means is that the preamplifier is not rolling off the low frequencies of your amplifier. The preamplifier has linear frequency response (as do all other quality preamps).
The solution to your problem is to use a DSP (Digital Signal Processor). With one of these, you can adjust the
thoughts on this??? |
Made by Conrad Johnson, does it have to do with impedances of tube preamps, or ones that CJ makes? |
So should i return the pre, look for a pre which is more compatable with my amp? The pre is quite nice, it definitely opens up my speakers quite a lot,! |
I do have bass, it just isnt as thick as before this preamp. Definitely some is gone.
Anything else i can do
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I always had all buttons off!, no contra bass was ever used.
Even with all the extras off, I had more boomy bottom end with onkyo. Strange.
Will output put volts have something to do w it?
Sanders is only 10 volts.
Onkyo and B&K were min 17 or 21 volts for driving the amp. I was using more of the amp, compared to the sanders
????? |
I will hook up my onkyo eq-540 equalizer, keep everything at 0 and just lightly boost the lower freq, just a little bit. Hate using an equalizer, but I don't have a choice, the sound I'm getting from the preamp is remarkable to say the least. Mids/highs NEVER sounded so crystalline / accurate before. Onkyo, mids & highs were recessed quite a bit more. Not as clean.
Maybe be its a trade off' lose a wee bit of bottom end, and gain exponentially in every other aspect. Worth it, sure is!! Will let burn in for 2 weeks, will report back. Thank you all. |
I get my volume, and then some, as well as bass, and everything I need!!! I have zero more to say about the bass, sound of my system. I have found my last amp, preamp for my ref system. Cables and CD player are on Santa's list, and time to re-import all 3000+ cd's in lossless. I wish those 1TB iPods weren't a f'n thousand dollars though, would love to have that, using iPod is so convenient through stereo.
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Changed a letter in my screen name. Same ol me.
\m/ |
Yes! Playing a cd i do have a little more bass. But i think the pre is slightly voiced to mid /high freq, for sanders electrostatic speakers which require this for the panels to become crisper. Just my opinion.
The pre is very neutral/accurate. I think it may work better on my cerwin vega d9's which are boomy, maybe a good combo, im also looking at the para p-5 and nad 165bee pre. 1k each. Might help with the bass with my ref system. |
Help me understand what happened here, i posted this in cables also
i bought a rocketfish rf-acnt2 component cable,. The 30 pin for older ipods etc, with component cables and usb on other end. My volume seemed to go up about 5x as loud vs using the 3.5mm jack on ipod to rca to preamp. Did i bypass the output of the ipod? Why did the bass, high, mids go up in volume 5 fold? Holy crapper, this is amazing. I thought my cd cheapo sounded good,.
Someone please explain. |
Thank you to everyone who has helped me. Merry Christmas this season, to you and your families.
Best!
R. |
I did change speaker wire, I hooked up 16" cables with banana plugs with true 8 awg wire, short runs to speaker, this definitely helped with the damping factor. I am using auqioquest quartz cables.
I will ill be getting some groneberg Quattro ref rca's in a week or two. Maybe this will add the missing low freq a little bit. |
Roger says how it sounds after the first hour, is what one will get indefinitely. |
Amps input imped is 10 kOhms
preamp: output 50 Ohm
input imped 47 KOhms
max output 10 volts
b&k output is I think 17 or 21. Pro 10 mc
onkyo p-308 not sure |
Yes, inquiring minds want to know............ |
Georgelofi;
Amp 10kohm, this could be the problem if your preamp is capacitor coupled on it’s output. As if the preamp’s output cap (if it has one), the size of it could have been calculated for a more normal (industry standard) >47kohm input impedance power amp.
Which the size of the cap may have been done so it’s say -3db at 10hz with a 47kohm poweramp. Which is fine.
But if that amp is 10kohm input then the -3db point will be 4.7 x higher at 47hz easily heard and so will sound like it has a bass roll off.
To test this, you can find out if the preamp is capacitor coupled by talking to the designer, or a quick test is to get another amp that you know is >47kohm input impedance and see if it still has a bass roll off.
So, I purchased a amp or preamp that is a mismatch? And won't sound good?? Wtf, I'm always fuc**ng something up.
Tried for a stellar system, and always something wrong when I make a purchase, Always!!!! Damn.
what is recommended? Sell preamp?
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Volume to 99 digital, I don't get volume until I reach almost 50 , from 50-99 is my range. I can set pre to add additional 18db gain,.
Great pre, won't be changing for long time |
I suppose if I knew these amps were hard to drive, I would have bought others which are more compatible , so I'm stuck, and blew my whole fuc**ing rat hole money which I saved for almost 5 Damn years for new amps, stereo, and I end up buying something which is not compatible with many preamps, because of some impedance output, f'n great, just great. Now I'm stuck with them, goddamnet !!!!!!!!!!!!!!!!!!!!!!!!!!!
nothing has ever gone correctly for me, I buy a new amp, breaks shortly after, preamps, with problems . I'm just gonna buy a Bose wave, and be done with this whole schlock, impedance, I or, output, capacitors, f this |
Georgelofi;
prior to the sanders I was using an onkyo p-308 from 1989.
Also, a B&K pro 10 mc. The onkyo is adding low freq, the B&K is closer in sound to the sanders I think,.............
will ill try to breathe, promise, I've just had such bad luck over the years, equipment, a job I wouldn't wish on my enemies, and other stuff as well. Sigh- the preamp does not have a sub output, I hate mucking around with eq's. I still have my old onkyo eq from. The early 90's, pristine shape, maybe hook it up one night and see what can be done.
Oh boy, . |
The preamp is just very accurate, neutral sounding. What I put in is what is going out, nothing more, nothing less, with the onkyo, it was boosting the low freq, per the specs. I guess I am not used to a neutral sound, reproducing exactly what is fed into it, through the speakers without coloration in the slightest.
I do do have bass, just not as boomy as with the onkyo, it is more controlled, tight, than before.
I dont know, with all this happening, I still feel. Maybe I bought lemon amps, with their goofy impedance of 10 kohm.
On on a good note, my speakers are a warm speaker, which makes for a descent combo really, as the highs are rolled off at 600 , so even with the rolled highs' the sanders pre, and McCormack amps really do make a good sounding combo feeding my Energy's.
I will ill give it a year, or maybe a little longer, to see how I like it.
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As far as the missing bass. I am using audioquest Quartz cables from 1991 or a1990, I'm sure things have changed since then. I will mess around with cables, and speaker wires also. Hopefully I can get back a small portion of my low end, then all will be prefect.
It's 2:30 now, time for a Negro Modelo !!!! Have a good evening everyone. |
I will be getting new cables, I called klaus at odyssey with money ready to spend, he said not til 1 week from now, he's going on holiday. Son of a ........I get ready and now I have to wait longer. My 1m pair are stretched very tightly from amp to preamp as it is, which is why I wanted to order the 1.5m Groneberg from klaus asap
i hooked up an old toshiba sd-4000 dvd player to use as a source, and mother fuc**** the bass is in full force. I was using my iPods at 128k to play through the preamp, and at 128k, I'm sure a lot of the low and highs have been left out during the sync to the iPod. I'm such a dipsh*t. Don't yell at me, it didn't hit me until I played some megadouche (peace sells), and some helstar (king of hell) cd's, the bass was massive, and so was everything else. Mercyful Fate is insane good now.
Also, the pioneer elite dv-48 I was using as a source, was giving me some very audible static noise from tweeters, why, I don't know, I pulled it, and now %85 of static is gone. Only a small bit of the same static noise is audible, maybe from house ac line, I don't know.
I will be getting a new CD player, most likely the NAD 565 for my source, my last CD player purchase was the acurus acd-11 which shows the last time I bought equipment, and the B&K pro 10 mc also back in early 90's. I am sure bass is back, as I played some same songs I played from iPod, and played the cd, and night and day difference. I am such a moron!
i am still investigating the bass issue, as I'm not completely sure a good source is absolute, I'll be back......... |
Hahahaha. Nooooooooooo
I know, I know, I'm a full on dipsh*t. Live & learn.
Happened years ago, when I didn't know about lossless, aac, what the fu*k a nitrate even was. So I have all my cd's, and many of my lp's ripped to my iTunes, at AAC (256) I didn't know what it all meant, now I do, it sounds great anywhere else, except for my main rig, where its resolution is bad when played through very good equipment.
It it took me several years to import all my cd's into iTunes, that in itself is another mess I'm not talking about.
Im not reimporting 3000 cd's and all my LP rips now all on taiyo yuden cd-r's. Back to iTunes, will take longer as I'm not as hung ho anymore. So I'm gonna live with the 256 versions. I will re arrange your iTunes, put all the live stuff, so I can load iPod back at 256 k, and not the 128 I was using. Hopefully this will help a little. We moved, so all my cd's are in boxes after 1 year, I hate it, but no room to display them anymore. |
