| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 482.1 | i dunno | WOTVAX::SALISBURYG | | Fri Jun 10 1994 18:31 | 7 |
| Can you draw this - I'm afraid I just cannot imagine what you mean
and why?
Oh and thanks for the suggestion of 780's have you got any
or heard any?
Thanks
G.
|
| 482.2 | | HLDE01::SOEMBA::RIK | Mostly Harmless | Mon Jun 13 1994 10:02 | 14 |
| No, unless both amps have speaker switches, or a speaker protection relay (open
when the amp is powered off) to electrically disconnect the unused amp from the
setup. Otherwise the inactive amp would load the active one with some very
a-linear load. Not nice, sonically and electrically.
If they have speaker switches, take care to switch the unused amp not to use the
speaker pair you've wired this to. Else get hold of a hefty four pole double
throw switch, or two double ones. You may get by connecting speaker ground
from both amps and only switching the (+) terminals, but only if the amps are
not bridged.
- Rik -
|
| 482.3 | | ESBS01::WATSON | Entropy: chaos at it's best | Mon Jun 13 1994 10:25 | 5 |
| QED do a speaker switch (SW-11 I think) which will do just this. It
also provides a 8ohm loading resistor for the unused amp. There is also
some kind of circitry to stop earths being commoned.
Rik
|
| 482.4 | Thanks | BAHTAT::HILTON | Beer...now there's a temporary solution | Mon Jun 13 1994 12:39 | 5 |
| Cheers,
Good job I checked!!
Greg
|
| 482.5 | Thanks for the advice! | BAHTAT::HILTON | Beer...now there's a temporary solution | Mon Jun 13 1994 12:41 | 7 |
| Cheers good job I checked.
I had thought that if one was physically powered off it would be ok.
Thanks again,
Greg
|
| 482.6 | | FILTON::NOBLE | You found God at the Smorgasbord? | Mon Jun 13 1994 16:16 | 3 |
| Come on then Sonic, what's it for?
Steev
|
| 482.7 | House wide sound ;^) | BAHTAT::HILTON | Beer...now there's a temporary solution | Mon Jun 13 1994 17:12 | 12 |
| Its for:
upstairs, amp connected to speakers for PC
downstairs, AN OTHER amp connected to speakers for Audio.
And I decided it would be good, if I could play stuff downstairs and
hear it upstairs!
Cheers,
Sonic
|
| 482.8 | | ESBS01::WATSON | Entropy: chaos at it's best | Mon Jun 13 1994 17:24 | 8 |
| Even if the 'other' amp is off don't do it. You'll still end up with
(potentially) different earths and driving the opamp on the 'other'
amp.
You're idea is a good one though - how else do you think I knew the QED
part number - I bought on at the W/E.
Rik
|
| 482.9 | Hole in the house? | BAHTAT::HILTON | Beer...now there's a temporary solution | Thu Jun 23 1994 14:38 | 8 |
| Rik,
How did you get the speaker cables upstairs, through the ceiling, or
through the wall cavity?
Cheers,
Greg
|
| 482.10 | Easy | ESBS01::WATSON | Entropy: chaos at it's best | Thu Jun 23 1994 15:40 | 3 |
| New house, helpfull builder.
Rik
|
| 482.11 | | HLDE01::63697::RIK | Mostly Harmless | Thu Jun 23 1994 15:41 | 14 |
| (another Rik)
I put a buffer in the downstairs preamp tape loop, and feed the low-level
signal to a line-level input on the upstairs amps (yes, two). No messy, hefty,
expensive switches and ditto cables, possibly dual speaker load on the
downstairs power amp etcetera, and the possibility to control volume without
yelling (useless in my case: I've never seen my cat turn the volume down, or
up) or running down the stairs.
The cable is ordinary telco dual twisted pair (the buffer has a nice low output
impedance), hidden behind a central heating pipe, then through the upstairs
floorboards.
- Rik -
|