Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.




14 posts

Geek
+1 received by user: 1


# 36199 21-Jun-2009 23:16
Send private message

Hi There,


This is my first post and I'm not terribly techical!


Yesterday I bought a Yamaha RX-V1900 Home theature Amp.
Have been trawling through the manual and there's a bit that worries me. Under multi zone configuration (which I won't use yet) theres a warning that says:


"Connection to a Passive Loudspeaker Selector Box or multiple speakers per channel could create an abnormally low impedance load resulting in amplifier damage."


For years now I have run one set of main speakers through my previous Home Theature Amp and a seperate 2 channel amp for music, via a QED switching box. Do you think this will be a problem? I wonder if the issue is more about folk selecting from multiple sets of speakers via a switching box, which is clearly not what I'm doing.


I'd appreciate your views on this.


Cheers


Create new topic
Mad Scientist
20155 posts

Uber Geek
+1 received by user: 2735

Trusted
Lifetime subscriber

  # 227238 22-Jun-2009 06:27
Send private message

you run 1 speaker per speaker out. if you want to connect an amp use the preamp out. i dont recommend connecting everything via speaker out.




Swype on iOS is detrimental to accurate typing. Apologies in advance.


Mad Scientist
20155 posts

Uber Geek
+1 received by user: 2735

Trusted
Lifetime subscriber

  # 227239 22-Jun-2009 06:27
Send private message

ps - that's an awesome receiver - how much did you get it for?




Swype on iOS is detrimental to accurate typing. Apologies in advance.


 
 
 
 


1757 posts

Uber Geek
+1 received by user: 364

Trusted

  # 227401 22-Jun-2009 15:47
Send private message



"Connection to a Passive Loudspeaker Selector Box or multiple speakers per channel could create an abnormally low impedance load resulting in amplifier damage."





I think they mean not to run a speaker switch box directly from tyhe speaker outputs, especially as some switch systems doa "make before break" meaning they make the connection to the next set of speakers before breaking the connection to the previous set, therefore creating a very low impeadance path when both pairs of speakers are bridged in parallel mode. You could end up with an impeadence of less than 2 ohms, which most amps will barf at. Shutdown / release smoke / etc


The separate 2 channel amp description that you mention won't have this issue., as everything is at a much higher impeadance.


 


SS


 





My thoughts are no longer my own and is probably representative of our media-controlled government




14 posts

Geek
+1 received by user: 1


  # 227506 22-Jun-2009 20:19
Send private message

Thanks for that. Yes, I've not had that much time to have a play with it .....so many configuration options, so little time.

Just experiementing with the option of using it for 2 channel use (if anything...my CD player is now the system weakness...it never ends ).

Got the RX-v1900 for ~$2300 - on sale at Harvey Norman.

Mad Scientist
20155 posts

Uber Geek
+1 received by user: 2735

Trusted
Lifetime subscriber

  # 227513 22-Jun-2009 20:40
Send private message

no it never ends! really, why dont you use the preamp outs for the other amp? the other option is to use zone 2 or B. mmmm rx-v1900 ... but it's way too costly!

if you want a new cd player get one with a hard disk!




Swype on iOS is detrimental to accurate typing. Apologies in advance.


3808 posts

Uber Geek
+1 received by user: 835

Lifetime subscriber

  # 227514 22-Jun-2009 20:41
Send private message

The V1900 is a 7.1 receiver with second zone capability. If your current home theatre set up is 5.1 (as most are) then you can just use channels 6 and 7 to power your two other speakers in a 'second room' configuration, even if they are in the same room.

That way there is no separate speaker switchbox and no chance of a low impedance/high current smoking amp moment.

Off the top of my head I can't remember, but does that model Yammy have A and B speaker connections as well?




Areas of Geek interest: Home Theatre, HTPC, Android Tablets & Phones, iProducts.



14 posts

Geek
+1 received by user: 1


  # 227547 22-Jun-2009 21:58
Send private message

Dingbatt: The V1900 is a 7.1 receiver with second zone capability. If your current home theatre set up is 5.1 (as most are) then you can just use channels 6 and 7 to power your two other speakers in a 'second room' configuration, even if they are in the same room.



That way there is no separate speaker switchbox and no chance of a low impedance/high current smoking amp moment.



Off the top of my head I can't remember, but does that model Yammy have A and B speaker connections as well?


There's up to three zones and I haven't completely got my head around that yet. Certainly understand what you are saying about multiple sets of speakers, but what I was asking about was effectively sharing one set of main speakers betrween two AMPs

cheers



14 posts

Geek
+1 received by user: 1


# 227550 22-Jun-2009 22:08
Send private message

joker97: no it never ends! really, why dont you use the preamp outs for the other amp? the other option is to use zone 2 or B. mmmm rx-v1900 ... but it's way too costly!



if you want a new cd player get one with a hard disk!


Yep...considered the pre-outs idea, with the added advantage that both the Amp's could heat the room too Wink

Actually don't own a flat screen yet - would have actually bought that first had it not been for my old (lower-mid-range) Sony HT Amp dying. CD player will have to wait. Do have Sony HDD/DVD recorder though. Oh but then there's MySky HDi...did we mention it NEVER ends Smile

Cheers

Mad Scientist
20155 posts

Uber Geek
+1 received by user: 2735

Trusted
Lifetime subscriber

  # 227551 22-Jun-2009 22:09
Send private message

bmr63: what I was asking about was effectively sharing one set of main speakers betrween two AMPs

cheers


ah i see now. as long as your switcher box separates the 2 circuits that ok i guess ... but if that fails you risk losing $2300 + / - speakers




Swype on iOS is detrimental to accurate typing. Apologies in advance.


Mad Scientist
20155 posts

Uber Geek
+1 received by user: 2735

Trusted
Lifetime subscriber

  # 227552 22-Jun-2009 22:11
Send private message

also if the switcher box is not built well your $2300 receiver becomes effectively a $50 warehouse stereo as it passes the sound through it




Swype on iOS is detrimental to accurate typing. Apologies in advance.




14 posts

Geek
+1 received by user: 1


  # 227553 22-Jun-2009 22:20
Send private message

joker97: also if the switcher box is not built well your $2300 receiver becomes effectively a $50 warehouse stereo as it passes the sound through it


The switch box was UK built and seemed of fairly solid quality. I can't remember where I bought it (years ago), but it was at a Hifi place (ie NOT the warehouse Wink). I know what you mean though. I didn't appreciate any real issues with performance using it.

For now, it's out of the circuit and I'm enjoying the Yam in 2 Ch 'direct' mode.


Nice.

Cheers Joker97

3808 posts

Uber Geek
+1 received by user: 835

Lifetime subscriber

  # 227649 23-Jun-2009 10:28
Send private message

Sorry I misunderstood your OP but the V1900 is quite a capable music amp as well so why not connect your CD player to it and run it in Stereo or one of the pure direct modes if you just want to power your L/R speakers.




Areas of Geek interest: Home Theatre, HTPC, Android Tablets & Phones, iProducts.



14 posts

Geek
+1 received by user: 1


  # 227661 23-Jun-2009 11:05
Send private message

Dingbatt: Sorry I misunderstood your OP but the V1900 is quite a capable music amp as well so why not connect your CD player to it and run it in Stereo or one of the pure direct modes if you just want to power your L/R speakers.


Yep, thanks mate, pretty much coming to that conclusion too. Took the switch out of the circuit last night and connected up the CD. Used Pure Direct and listened to a few disks. Was really very good so that's probably the direction I'm going in.

Cheers

Create new topic



Twitter »

Follow us to receive Twitter updates when new discussions are posted in our forums:



Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:



Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:





News »

Video game market in New Zealand passes half billion dollar mark
Posted 24-May-2019 16:15


WLG-X festival to celebrate creativity and innovation
Posted 22-May-2019 17:53


HPE to acquire supercomputing leader Cray
Posted 20-May-2019 11:07


Techweek starting around NZ today
Posted 20-May-2019 09:52


Porirua City Council first to adopt new council software solution Datascape
Posted 15-May-2019 12:00


New survey provides insight into schools' technology challenges and plans
Posted 15-May-2019 09:30


Apple Music now available on Alexa devices in Australia and New Zealand
Posted 15-May-2019 09:11


Make a stand against cyberbullying this Pink Shirt Day
Posted 14-May-2019 20:23


Samsung first TV manufacturer to launch the Apple TV App and Airplay 2
Posted 14-May-2019 20:11


Vodafone New Zealand sold
Posted 14-May-2019 07:25


Kordia boosts cloud performance with locally-hosted Microsoft Azure ExpressRoute
Posted 8-May-2019 10:25


Microsoft Azure ExpressRoute in New Zealand opens up faster, more secure internet for Kiwi businesses
Posted 8-May-2019 09:39


Vocus Communications to deliver Microsoft Azure Cloud Solutions through Azure ExpressRoute
Posted 8-May-2019 09:25


Independent NZ feature film #statusPending to premiere during WLG-X
Posted 6-May-2019 22:13


The ultimate dog photoshoot with Nokia 9 PureView #ForgottenDogsofInstagram
Posted 6-May-2019 09:41



Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.


Support Geekzone »

Our community of supporters help make Geekzone possible. Click the button below to join them.

Support Geezone on PressPatron



Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.