MONOBLOCKS
Hi,
You are correct, being able to put them closer to the speaker can be an advantage.
Possibly less crosstalk, better stereo separation too.
Less interaction of ground currents also.
Other deciding factors may be weight and heat convection, there may be other factors I overlook as well.
Cheers,
Hi,
You are correct, being able to put them closer to the speaker can be an advantage.
Possibly less crosstalk, better stereo separation too.
Less interaction of ground currents also.
Other deciding factors may be weight and heat convection, there may be other factors I overlook as well.
Cheers,
mrfeedback said:
In that configuration, you end up with conductive loops formed by the grounds of the interconnects. Quite large loops too if you keep your interconnects separated which would make for greater coupling of any magnetic field interference and subsequent noise at the amplifier's inputs.
se
Hi F and Eric.
I guess monoblocks can cause a ground loop problem. The signal wire coming from the preamp normally connects both channels together, and the power cord also has a common connection back to the Safety Earth. So that's 2 paths from left monoblock chassis over to right monoblock chassis.
I've read where it works to keep the safety ground connected to the poweramps chassis (safety first)- but "float" the signal ground above the chassis gnd with a decent sized (min. 2W) 10-50 ohm resistor
What works best??
Craig Ryder
I guess monoblocks can cause a ground loop problem. The signal wire coming from the preamp normally connects both channels together, and the power cord also has a common connection back to the Safety Earth. So that's 2 paths from left monoblock chassis over to right monoblock chassis.
I've read where it works to keep the safety ground connected to the poweramps chassis (safety first)- but "float" the signal ground above the chassis gnd with a decent sized (min. 2W) 10-50 ohm resistor
What works best??
Craig Ryder
URBAN MYTHS.
Hi,
Nah, only if designed wrongly.
I have used monoblocks (physically two separate chasis) for poweramps and have never experienced any problem with them.
My preamp is dual mono, not two monoblocks, so ground is common to both channels.
Monoblock design should be superior to integrated left and right channel.
Cheers,
Hi,
Nah, only if designed wrongly.
I have used monoblocks (physically two separate chasis) for poweramps and have never experienced any problem with them.
My preamp is dual mono, not two monoblocks, so ground is common to both channels.
Monoblock design should be superior to integrated left and right channel.
Cheers,
Ryder said:I've read where it works to keep the safety ground connected to the poweramps chassis (safety first)- but "float" the signal ground above the chassis gnd with a decent sized (min. 2W) 10-50 ohm resistor
What works best??
Getting rid of that damned AC power supply, that's what.
Actually, the method you mention above can be effective, though I prefer placing a 0.01uF cap in series with the resistor. That provides greater isolation at power line frequencies and the cap alows for a low impedance path to the chassis at high frequencies so that the chassis can work well as an electrostatic shield.
se
Re: AC GROUNDING.
Wouldn't surprise me. I first saw it at least 20 years ago.
Yup. Another clever trick (short of ditching the AC power supply completely) is to use a Class II double insulated chassis and ditch the !@#$% safety ground.
Sadly, there are probably a lot of commercial products out there whose chassis meet Class II specs but because the 3 conductor power cord has become so ubiquitous, the manufacturers just tack on an IEC socket out of habit and to be compatable with all the aftermarket IEC power cords.
se
fdegrove said:
Wouldn't surprise me. I first saw it at least 20 years ago.
Clever little trick,that one.
Yup. Another clever trick (short of ditching the AC power supply completely) is to use a Class II double insulated chassis and ditch the !@#$% safety ground.
Sadly, there are probably a lot of commercial products out there whose chassis meet Class II specs but because the 3 conductor power cord has become so ubiquitous, the manufacturers just tack on an IEC socket out of habit and to be compatable with all the aftermarket IEC power cords.
se
Steve Eddy said:Getting rid of that damned AC power supply, that's what.
Wow, what an idea. My monoblocks are looking like weighing about 50kg ea when the chassis are finished, so if I go battery power to give me 900V, maybe I'll just add on an extra room for them all. Seventy four truck batteries if I want to keep them monos. Batteries R us are gonna love me.
No one light a match when they're recharging.
Brett said:Wow, what an idea. My monoblocks are looking like weighing about 50kg ea when the chassis are finished, so if I go battery power to give me 900V, maybe I'll just add on an extra room for them all. Seventy four truck batteries if I want to keep them monos. Batteries R us are gonna love me.
That's the spirit!
se
But pls remember that in one chassis if u use full triode version to push 300B. very easy to cross the noise.
this is the problem must be careful to handle.
If U like to use one chassis but near monoblock powerful swing.
one power trans with use seperate chokes ( every channel use one choke) & rectifier cap.
this will better.
thanks
Thomas
this is the problem must be careful to handle.
If U like to use one chassis but near monoblock powerful swing.
one power trans with use seperate chokes ( every channel use one choke) & rectifier cap.
this will better.
thanks
Thomas
Which is better.
I would say probably the shorter speaker cables are better. They are more difficult to have ( heavy) shielded braids with low impedance and generally their dc resistance will be lower if they are shorter.
For balanced low level signal lines especially at 600 ohms , frequency response, damping (?) shielding etc will be much better.
So I hazzard a guess that this might be a better way to go. It also avoids the ground loops mentioned earlier - or can be avoided with careful planning.
Balanced lines here we come !
I would say probably the shorter speaker cables are better. They are more difficult to have ( heavy) shielded braids with low impedance and generally their dc resistance will be lower if they are shorter.
For balanced low level signal lines especially at 600 ohms , frequency response, damping (?) shielding etc will be much better.
So I hazzard a guess that this might be a better way to go. It also avoids the ground loops mentioned earlier - or can be avoided with careful planning.
Balanced lines here we come !
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