Input level controls
rubin
Posts: 565
When I adjust these nobs located on the amps rear plate,it raises/lowers speaker volumn.
My question is ,does this increase/ decrease input impedance as seen by the preamp? Why does the amp have these controls anyway?
My question is ,does this increase/ decrease input impedance as seen by the preamp? Why does the amp have these controls anyway?
Post edited by rubin on
Comments
-
it doesn't change what the pre-amp see's. they are gain/volume knobs to help level match the system if and when there is a difference in individual amp systems, as on powered sub woofers. for the most part you should just set them and not have to touch them again most pre-amps and receivers have a digital speaker level adjustment i'm sure some one else on here will be able to word it a bit better than i have.
what amp and pre-amp is it?Speakers:
Definitive BP7001sc mains
Definitive C/L/R 3000 center
Polk RT800i's rears
Definitive supercube I Sub
Audio:
Onkyo TX-NR3010
Emotiva XPA five Gen 3
OPPO BDP-103 CD, SACD, DVD-A
Video:
Panasonic TC-P65ZT60
OPPO BDP-103 Bluray
Directv x's 2 -
I think that answers it quite well ....Thanks
Nad c272 x2 Jolida tube pre. -
Usually it's best to leave the amps gain at 100%. Probably has something to do with maximizing S/N ratio.Source: Bluesound Node 2i - Preamp/DAC: Benchmark DAC2 DX - Amp: Parasound Halo A21 - Speakers: MartinLogan Motion 60XTi - Shop Rig: Yamaha A-S501 Integrated - Shop Spkrs: Elac Debut 2.0 B5.2
-
Same question was asked here.http://www.polkaudio.com/forums/showthread.php?t=81275Testing
Testing
Testing -
The amps are used for passive bi-amping(vertical).For the bass drivers the gain is at 100%.For the tweets around 70% (I'm treble sensitive) Speakers are paradigm 100's v2 with metal dome tweeters.Just wondering if the imbalanced settings could harm the amps.
-
Usually it's best to leave the amps gain at 100%. Probably has something to do with maximizing S/N ratio.
Yes sir.
BenPlease. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
Thanks
Ben -
No worries of it hurting the amps but the speakers won't sound the way their designer intended, but if you like it then thats all that matters.Testing
Testing
Testing -
No worries of it hurting the amps but the speakers won't sound the way their designer intended, but if you like it then thats all that matters.
Glad to hear that. I called paradigm asking if I could somehow replace the tweeters with soft/silk domes types.They said flat out no. -
He He I'm not surprised you got that response from them.I have heard of others not liking that Paradigm tweet or aleast how they have voiced the top end of the systems using it.I called paradigm asking if I could somehow replace the tweeters with soft/silk domes types.They said flat out no.Testing
Testing
Testing -
He He I'm not surprised you got that response from them.I have heard of others not liking that Paradigm tweet or aleast how they have voiced the top end of the systems using it.
Some like'em others don't.I like a laid back sound .Cutting power to the top end along with the tube pre now gives me what I want.The only draw back I would say is less detail in the music,but I'll accept the trade-off.
Thanks to all who replied. -
btw I wasn't meaning to dis Paradigm as they are a world class company that have engineered many fine speakers.Testing
Testing
Testing -
btw I wasn't meaning to dis Paradigm as they are a world class company that have engineered many fine speakers.
No offence taken.I do like my 100's.I've owned them since 2000.The majority of reviewers favour them,I guess my ears have become more sensative(damaged?) to hi freq.Anyway like I said reducing power to the top end, with the expected trade-offs has satisfied me,although there are better alternatives eg.- different speakers amps etc.But for now this compromise is ok . -
Does anyone know of a company that can build custom tweeters that I can install without butchering the cabinets, or can provide kits to change mine to soft dome types,for the Paradigm reference studio 100 v.2? I believe DarqueKnight was able to do something like this to the tweets in his sda's.
-
It's doubtful, but you can try contacting Madisound or Parts Express. If you can have someone measure the T&S parameters, maybe you could find a similar model that is more pleasing to your ears.
Or, you could tweak the crossover. Adjusting resistance or using a different brand of caps may help. Do you have a schematic?"He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche -
It's doubtful, but you can try contacting Madisound or Parts Express. If you can have someone measure the T&S parameters, maybe you could find a similar model that is more pleasing to your ears.
Or, you could tweak the crossover. Adjusting resistance or using a different brand of caps may help. Do you have a schematic?
Good advice....thanks,If I add an in line resistor to the tweeter wire would that help , what value of resistance would I need and also to which lead + or - -
The best way to do it would be to replace the current one with one of slightly higher resistance."He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche
-
The best way to do it would be to replace the current one with one of slightly higher resistance.
I would rather not fool with the speakers crossover since I'm not an electronics guy.I just thought I could splice a resistor into one of the leads going to the tweeter to restrict power going to it thus reducing its output.I don't have a schematic nor could I read it. -
You are achieving the exact same thing by turning down the level controls on the tweeter's amp.Testing
Testing
Testing -
You are achieving the exact same thing by turning down the level controls on the tweeter's amp.
Yes I know but it cuts power to the midrange driver also. So if I add extra resistance to the tweeter then I turn up the level on the amp to get more mids.Does this sound like a reasonable alternative? -
A reasonable alternative to me is to get speakers you like.Simple....if the tweet doesn't agree with you,you'll never be happy.I too,am sensitive to high freq. that make your ears hurt after an hour of listening.I have found the Legacy brands,Montana brands,to be more up my alley and can listen for 8 plus hours with no fatigue.Go out an listen to some other speaks,try and buy a demo pair,may save some coin that way.The only other thing I can think of to tame your tweets is to try different cables.HT SYSTEM-
Sony 850c 4k
Pioneer elite vhx 21
Sony 4k BRP
SVS SB-2000
Polk Sig. 20's
Polk FX500 surrounds
Cables-
Acoustic zen Satori speaker cables
Acoustic zen Matrix 2 IC's
Wireworld eclipse 7 ic's
Audio metallurgy ga-o digital cable
Kitchen
Sonos zp90
Grant Fidelity tube dac
B&k 1420
lsi 9's -
OK since both the midrange and tweeter share the same set of binding posts your only fix would be to modify the tweeters crossover,by changing a series resitor.Yes I know but it cuts power to the midrange driver also. So if I add extra resistance to the tweeter then I turn up the level on the amp to get more mids.Does this sound like a reasonable alternative?Testing
Testing
Testing -
A reasonable alternative to me is to get speakers you like.Simple....if the tweet doesn't agree with you,you'll never be happy.I too,am sensitive to high freq. that make your ears hurt after an hour of listening.I have found the Legacy brands,Montana brands,to be more up my alley and can listen for 8 plus hours with no fatigue.Go out an listen to some other speaks,try and buy a demo pair,may save some coin that way.The only other thing I can think of to tame your tweets is to try different cables.
Thanks ,only problem is no$$$$$$$, However I'll keep those brands in mind. -
Typically the top posts are for the tweeter only, that's odd that they're for the mid also."He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche
-
OK since both the midrange and tweeter share the same set of binding posts your only fix would be to modify the tweeters crossover,by changing a series resitor.
Ok GV,Thats what I want to try,but I dont want to touch anything on the crossover board.Just want to cut a wire at the tweeter and install a resistor.
But I dont know what size resistor to try.eg. 1,5,10 100 ohms?BTW where do u live I'm close to Niagara Falls In ONT. -
Typically the top posts are for the tweeter only, that's odd that they're for the mid also.
YEP,two sets of posts, top one for the upper range (tweet and mid) lower for the twin bass drivers.It must be a board that splits the signal frequency to the appropriate driver I guess. -
Was reading a post about the Jolida phono tubed preamp where he said there was a little grain to it.Then he removed the metal cylinders from around the tubes and found improvement.I have the Jolida tubed preamp with those same cylinders. The manual says nothing about them but I removed mine also......It took some of that bite out of the tweeters.Now i can listen with more comfort!!!!! It pays to read these posts.
-
Once again ,thanks to all who replied .I think I'll pour a couple beers into favourite my Hard Rock glass (from London England) Cheers.
-
Testing
-
Just swapped in some Mullard CV4024's ...... Nice, warm ,smooth.
