Forum NewsForumsHTF Chat Hardware ReviewsSoftware Reviews HTF Events
Home Theater Forum
Home Theater Forum
Home Theater Forum
Home Theater Forum
Live Search: 
Web Search: 
 
Home Theater Forum
Home Theater Forum
Home Theater Forum




 
Forum Jump

Forum Sponsors


Post New Thread  Reply

 
Thread Tools Search this Thread
Home Theater Forum
Old 05-24-2003, 06:30 AM   #1 of 4
Stuart Mundy
Member
 
Join Date: Nov 2002
Local Time: 10:48 AM
Local Date: 11-19-2008
Posts: 31

Hi All Looking for opinions on whether you think this Amp (Rotel Power amp model # RB980BX )which is going on EBay at the moment would be Ok to drive a EBS 142Ltr Shiva, which is currently sharing a plate Amp with another Sub and it's a pain keep unpluging one to run the other ! Ideally I would like to run both
Stuart Mundy is offline Quote this post in a PM Send Support Ticket
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote Multi-Quote with this Post
sendpm.gif
Home Theater Forum
Home Theater Forum
Home Theater Forum
Home Theater Forum
Old 05-24-2003, 12:25 PM   #2 of 4
RichardHOS
Member
 
Join Date: Mar 2003
Local Time: 11:48 PM
Local Date: 11-18-2008
Posts: 463

At ~130 watts/channel @8 ohms it should have adequate power, but my first thouht is the impedance of the driver. The Shiva (IIRC) has dual 8 ohm voice coils. The choices I can see for powering a single Shiva with a 980BX are:

(1) Each channel drives a single voice coil @ 8ohms, 260 watts total
(2) Bridge the 980 into a single voice coil @ 8ohms, ~360 watts total (about a 2db increase in output over option 1) but the loss of one voice coil and a 3dB drop in max output
(3) Series voice coils for a 16 ohm load and bridge the 980 into that load, probably around 260 watts total output there as well.


Unfortunately, you can't bridge the 980 into a 4 ohm load, which would be ideal for powering a single driver. If you're adventurous, you might use an RDO configuration to present a single load to the 980 that falls somewhere between 4ohm and 8ohm... and hope you find a point the amp can drive well without melting.

Of course, one way to make life easier would be adding a second Shiva. Use parallel connection for each speaker, presenting two 4 ohm loads to the 980. That would give approx. 340 watts combined output into those loads... as good as you could do with a single driver, but you would have twice the displacement to work with (or, more importantly since power is fixed, you would lower distortion for any output level).

If you are sure you can only afford or only have room for a single Shiva, and are sure you want to use the Shiva, but want to look for a better amp choice, then try to find an amp stable into 2ohms (bridged into a 4 ohm load).

Or, finally, if you are set on that amp and want to find a better driver match for it, look for a driver with either a single 8ohm voice coil or dual 4 ohm coils. A single 4 ohm or dual 2 ohm coils would limit you to the same options as a single Shiva more or less.
RichardHOS is offline Quote this post in a PM Send Support Ticket
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote Multi-Quote with this Post
sendpm.gif
Home Theater Forum
Home Theater Forum
Old 05-24-2003, 12:29 PM   #3 of 4
RichardHOS
Member
 
Join Date: Mar 2003
Local Time: 11:48 PM
Local Date: 11-18-2008
Posts: 463

Oops, just reread and noticed you already have the Shiva and enclosure.

In that case, I'd suggest either option 1 (which would probably be plenty powerful), if adventurous try the RDO thing (ask others for advice on that, not my cup of tea), or look for a different amp that is stable into 2 ohms (stable bridged into a 4 ohm load).

You know, for the price, a small QSC amp would probably fit the bill. I do like Rotel amps though... I have six RB-981's currently, and think I'm going to add another pair.
RichardHOS is offline Quote this post in a PM Send Support Ticket
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote Multi-Quote with this Post
sendpm.gif
Home Theater Forum
Home Theater Forum
Old 05-24-2003, 08:07 PM   #4 of 4
Stuart Mundy
Member
 
Join Date: Nov 2002
Local Time: 10:48 AM
Local Date: 11-19-2008
Posts: 31

Thank you Richard for your informed reply, some more thought is required !
Stuart Mundy is offline Quote this post in a PM Send Support Ticket
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote Multi-Quote with this Post
sendpm.gif
Home Theater Forum
Post New Thread  Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search



Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are Off
Pingbacks are Off
Refbacks are Off
Forum Jump

All times are GMT -5. The time now is 06:48 PM.
Total Page Views Since 7/8/2006: 175,769,016 | Page Views Today: 203,873


Powered by vBulletin Version 3.5.4
Copyright ©2000 - 2008, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.2.0

© 1997-2008 PARRON Enterprises, LLC
No part may be copied or reproduced without the
express written permission of the owners of this site.

  
Skin Chooser: