Tweeter hiss: lsi15 = hiss, lsi9 = no hiss

SlowcarIX

when theres no audio input and avr/amp is idling, the lsi15 hisses - not bad, audible when ear is 2 - 3" away from tweeter. on the lsi9, its completely quiet....

the hiss does not increase when the when the volume on the avr is turned up w/o audio input.

what is causing the 15 to hiss and not the 9?

mightymouse

The hiss is coming from your receiver.

ohskigod

if there is no signal, the main amps of your reciever are on, but the surround ones are off. something to that extent. definitly not the speaker, as there is no way for a speaker to hiss without it coming from an amp section (or at least that I know of)

I've seen recievers hiss (havign to put ear up to it to hear it. seems kind of normal to me. if it gets to loud it might become an issue though

cfrizz

What the others have said. It's the power being supplied by the receiver to the amps since the receiver is on.

Now if you had an increase of the hiss or a hum then you would have the dreaded ground loop syndrome & that's a pain in the butt!

SlowcarIX

mightymouse wrote: »

The hiss is coming from your receiver.

but why does it happen on the 15s and not the 9s? the 9 is dead silent...

tonyb

Could be a bad cable in the mix too or static from your carpet.Wool carpets are notorious for it.

tcrossma

SlowcarIX wrote: »

but why does it happen on the 15s and not the 9s? the 9 is dead silent...

So you're saying that you power down the system, swap the front 15's with 9's, power it all back up and it's dead silent. Put the 15's back on the front and there's hiss?

Or do you have the 9's and the 15's hooked up at the same time?

SlowcarIX

tcrossma wrote: »

So you're saying that you power down the system, swap the front 15's with 9's, power it all back up and it's dead silent. Put the 15's back on the front and there's hiss?

Or do you have the 9's and the 15's hooked up at the same time?

yes. thats what is happening

mightymouse

That's strange.

Did you check your speaker cable connections, and that the terminal ends are not touching each other.

Could this be due to the sensitivities of each speakers, i.e. the 15's are more sensitive than the 9's, that's why the more sensitive 15's are picking up the noise?

SlowcarIX

the speaker wire is banana plug terminated at both amp/speaker side

tonyb

Try switching I/C cables from the receiver to the amps.Then try it without the amp,hooked up to the receiver alone.

F1nut

That kind of hiss is normal, maybe the tweeters are dead in the 9's.

tcrossma

When I had just my AVR hooked up to my LSi15's it was dead quiet. I added the amp, still dead quiet. I then added my Adcom pre-amp, and my 15's had slight hiss. I swapped out my Signal Cable Analog II's from my CD player to my pre-amp with some Kimber Hero's, hiss went away.

The hiss I was hearing sounded perfectly normal to me, and it's what I have heard in many stereo systems in the past, so I didn't think much of it. So maybe play around with IC's and see if you can at least narrow it down. It may just be a normal side-effect of your components that you'll have to live with. It does seem odd that it's only doing it with your 15's and not the 9's, but there's probably a logical reason for it.

F1nut

BTW, just kidding about the dead tweeters.

It does seem rather odd that you don't get the hiss with the 9's.

SlowcarIX

lol, i'm keeping the 9 and getting rid of the 15s, no 15, no hiss

F1nut

It may have to do with the crossover design difference between the two. That said, the type of hiss you're describing is perfectly normal and should not be considered a problem.

SlowcarIX

so i did this...connected both the 9 and the 15 to the avr directly...and there is no hiss on both the 9 or the 15

the problem is in the amp...

Systems

mightymouse wrote: »

Could this be due to the sensitivities of each speakers, i.e. the 15's are more sensitive than the 9's, that's why the more sensitive 15's are picking up the noise?

Yes if one speaker is a few db more sensitive then the noise will be that same level of db louder.

wizzy

Stick a cat in front of the hissing tweeters and watch the battle it out.

mightymouse

I took a look at the D-Sonic webpage.

Looks like those D-Sonic amps are digital amps. Could it be that digital amps have a higher noise floor than conventional class A/B amps? Or it could be D-Sonic's particular implementation of their own digital amps.

Anyways, if you determined that there is no hiss if you hook the speakers directly to the receiver, then there is nothing wrong with either your LSi9's or your LSi15's.


And one question, how did you manage to plug banana plugs into the back of your LSi9's? It doesn't look like those binding posts on the 9's can accept banana plugs.

SlowcarIX

wizzy wrote: »

Stick a cat in front of the hissing tweeters and watch the battle it out.

you know i got a cat....and he does not seem to be affected by it

SlowcarIX

mightymouse wrote: »

I took a look at the D-Sonic webpage.

Looks like those D-Sonic amps are digital amps. Could it be that digital amps have a higher noise floor than conventional class A/B amps? Or it could be D-Sonic's particular implementation of their own digital amps.

Anyways, if you determined that there is no hiss if you hook the speakers directly to the receiver, then there is nothing wrong with either your LSi9's or your LSi15's.


And one question, how did you manage to plug banana plugs into the back of your LSi9's? It doesn't look like those binding posts on the 9's can accept banana plugs.

if you remove the nut, there will be a red/black plastic cap, remove them and there is a hole down the middle of the binding post that you can stick a banana plug into

mightymouse

Thanks for the tip! Didn't realize I can remove those red and black caps.:D

Systems

SlowcarIX wrote: »

if you remove the nut, there will be a red/black plastic cap, remove them and there is a hole down the middle of the binding post that you can stick a banana plug into

Ahhh those plastic plugs are most likely there because of the European (CE) safety standards require them.Apparently some countries AC voltage plugs are an exact fit for 3/4" spaced speaker binding posts.:eek:

SlowcarIX

another tip...i bought a whole bunch of banana jacks for 3 pairs of presence/surround/back surround...if you use the jacks, you will not be able to mount the speakers flush to the wall...so i just stuff the whole 12gauge thru the hole thru the binding post and crank down the nut

SlowcarIX

GV#27 wrote: »

Ahhh those plastic plugs are most likely there because of the European (CE) safety standards require them.Apparently some countries AC voltage plugs are an exact fit for 3/4" spaced speaker binding posts.:eek:

i thought those are dust covers....didnt know its for safety

things you learn everyday

Systems

SlowcarIX wrote: »

i thought those are dust covers....didnt know its for safety

things you learn everyday

If the speaker has a CE certification label then I' ll bet thats their purpose.

mightymouse

Learn something new here everyday.