Author Topic: Wt-800  (Read 80 times)

Offline glostikwilly

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Wt-800
« on: January 10, 2018, 12:01:50 PM »
Hey all, I just bought a used wt-800, I want to be able to run it in bridge mode, but I know nothing about it since my current amp(wt 550) doesn't have/need it.  here is a list of gear, will they run together in bridge mode with the 800

WT-800
dxlt 410
dxlt 115

Offline TobiasMan

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Re: Wt-800
« Reply #1 on: January 10, 2018, 12:19:23 PM »
Are your cabs 4 ohm or 8 ohm?


If 8 ohm they will work fine in Bridge mode - with a resulting 4 ohm load.  If 4 ohm, the resulting load on the amp would be 2 ohms and the WT800 cannot run in Bridge mode at 2 ohms safely.


Another issue is the difference in power handling capacity of the two cabs.  The D410 XLT will handle 700 watts but I believe the D115 XLT handles considerably less at 400 watts max.


When you run in Bridge mode you can't control the power each cab receives independently, so although the amp would produce 1100 watts into a 4 ohm load, trying to turn it up to get full power to your 410 will damage your 115.


If your cabs are 4 ohm units, you'd be better off to run them in normal/stereo mode, with each cab connected to one of the two outputs on the back.  Your amp would put out about 440 watts per channel and you could use the Balance knob to allow full power to the 410 and reduce the power to the 115 to ensure it isn't overpowered.
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410XLT, 410XST, Generic bin with 2 15" EVs

Offline Bob Cruz

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Re: Wt-800
« Reply #2 on: January 10, 2018, 12:37:38 PM »
T-Man, the WT800 was only rated to run 4 ohms in bridged mode for a few years and most WT800s can only bridge into 8 ohms.  OP, the power handling and volume of your two cabs is so different, the only sensible way to run them is one on each amp so the power sent to each cab can be matched to its capabilities.  Peace, Bob
Bob Cruz

WTX260 - GB Streamliner 900 - Mesa WalkAbout - Peavey USA Cirrus 5 - SX Jazz 5 x2 - BC Rich Mockingbird 5 - Cruz 112 x2 (22 pound flyweight cabs I built) - Kustom 115 D140F - Avatar Neo 112 x 2 - Fender Rumble 40

Offline Paulinderwick

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Re: Wt-800
« Reply #3 on: January 10, 2018, 12:52:16 PM »
And don't forget do NOT switch to or from bridged mode with the amplifier switched on or you will fry the innards - download the manual if you haven't got it already - http://www.edenamps.com/wt800.html
UK member, WT330, WTX260, 2 x EX112 (both 4 ohm), WTDI, and a Microtour as well as a Roland Super Cube Bass, Blackstar HT5, Fender Jazz '67, Fretless Fender Jazz '70, Burns Barracuda, Epiphone EB-0, Ashbory, Stagg EUB and guitars and ukuleles and a mandolin as well

Offline TobiasMan

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Re: Wt-800
« Reply #4 on: January 11, 2018, 01:01:36 PM »
The 2003 manual for the WT800 says:
400 watts @ 4 ohm (280 watts at 8 ohms) not clear whether that is Bridged or not, but I'm guessing it is referring to stereo mode.


The 2005 manual says:
Stereo mode
300 watts per channel @ 8 ohms
440 watts per channel @ 4 ohms
550 watts per channel @ 2 ohms
Bridge mode
880 watts @ 8 ohms and 1100 watts @ 4 ohms


The 2006 manual says:
Stereo mode
300 watts per channel @ 8 ohms
440 watts per channel @ 4 ohms
550 watts per channel @ 2 ohms
Bridge mode
880 watts @ 8 ohms
1100 watts @ 4 ohms


2013 and 2014 manuals (the abbreviated Marshal version)
Says nothing about power in stereo mode ??? ??
Bridge mode
880 watts @ 8 ohms
1100 watts @ 4 ohms


Appears to me that the WT800 has always been capable of Bridge mode output of 1100 watts @ 4 ohms.


That's what I said, the power handling of the two cabs are so different he needs to run them in stereo mode, using the balance knob to ensure that the 115 doesn't get too much power.
_________________________________________________________________
NXT5 EUB, MTD 535 Fretless, Tobias Killer B-6, 72 Fender Precision
WTX1000N, WP100 Navigator, QSC PL230, WT500, WTDI, Fender Bassman 10
410XLT, 410XST, Generic bin with 2 15" EVs

Offline Bob Cruz

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Re: Wt-800
« Reply #5 on: January 11, 2018, 02:04:26 PM »
T-Man, I think you've shown us that 2005 was the first year for bridged operation into 4 ohms.  OP, what's the build date on the back of your WT800?  Peace, Bob
Bob Cruz

WTX260 - GB Streamliner 900 - Mesa WalkAbout - Peavey USA Cirrus 5 - SX Jazz 5 x2 - BC Rich Mockingbird 5 - Cruz 112 x2 (22 pound flyweight cabs I built) - Kustom 115 D140F - Avatar Neo 112 x 2 - Fender Rumble 40

Offline Rip Van Dan

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Re: Wt-800
« Reply #6 on: January 13, 2018, 03:30:31 AM »
Just to be real clear so you don't accidentally fry your amp, prior to 2005 with the release of the WT800B (manual dated July 15, 2005) when it very specifically says that it will produce 550-watts per channel @ 2 ohms and 1100 watts bridged at 4 ohms, the maximum ohms bridged was 8 ohms.  All of these previous WT800's are what is known as the WT800A model, as opposed to the WT800B and WT800C. 

Now to confuse matters, the WT800A model had b, c, and d updates and were marked WT800b, WT800c and WT800d on the back of the amp.  All of these are in fact WT800A models.  The one thing they had in common was that they all used banana plug connectors because Speakon connectors weren't a thing yet.  If you put these amps in bridged mode and try to run it with a 4 ohms load, it will first of all get really hot and then release the magic smoke, and it will do this quickly.  If you see the magic smoke leaking out of your amp (a "very bad thing") you may very well have to replace one or both of your power sections and probably your power supply too.  If you're WT800 has banana connectors and says "8 ohm minimum load" next to the bridged output, do NOT try to hook two 8 ohm cabs or one 4 ohm cab to it or you will damage the amp.

My WT500/800 amp was upgraded by David Nordschow to 400-watts per channel at 4 ohms and 800-watts bridged at 8 ohms from its original 250 watts per channel @4 ohm and 500 watts per channel at 8 ohm.  He very specifically told me it is the same power section as the earlier WT800A and not the later WT800B and WT800C.

From July 2005 until Marshall bought Eden (Dec. 31, 2011), all of the WT800 that could handle 4 ohms bridged were marked "4 ohm minimum load" at the bridged output.  If your amp says this, you're golden.  It was made to run a 4 ohm load bridged.  However, when Marshall took over Eden, they "weren't comfortable" with the bridged at 4 ohms rating despite the fact that the amp had run bridged at 4 ohms with no problems for 7-years.  So they changed the text (and nothing internally at all) to say "8 ohm minimum load bridged".  That amp can safely run bridged at 4 ohms.  The good news is that the ones they did this to can all be easily identified by the backlit logo (we call it the "porchlight") on the front of the amp.  That was one of the changes made from the WT800B to the WT800C.  If your amp does NOT have the porchlight logo, and does not specifically say "minimum load 4 ohms bridged", DO NOT attempt to run it at 4 ohms bridged.

If you have questions, check back here and if Armin contradicts any of us, go with what Armin says.  He's had them on his bench.

Dan
Rip Van Dan
Dan Gracia
'82 US-made Fender Jazz Bass with maple neck
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