Roland Rock Posted January 19, 2014 Share Posted January 19, 2014 In theory, if I had a Crown xti2000 power amp, http://www.crownaudio.com/xti-series.html What are my options with two 4ohm cabs? can I run one off each channel (via the rear speakons) and send 800w to each? Quote Link to comment Share on other sites More sharing options...
discreet Posted January 19, 2014 Share Posted January 19, 2014 Looks like it going by the spec table. Dual mode > two channels > 4ohms/800W each cab. Quote Link to comment Share on other sites More sharing options...
Roland Rock Posted January 19, 2014 Author Share Posted January 19, 2014 (edited) Thanks for that,that's more or less what I thought. I was a bit confused by the sockets on the back, banana plugs etc. hopefully I would only need to use the speakon one like on a normal bass amp. I have plans to demolish Nottingham! Edited January 21, 2014 by Roland Rock Quote Link to comment Share on other sites More sharing options...
ahpook Posted January 19, 2014 Share Posted January 19, 2014 Yes... and there's always a but... BUT...what are you going to be driving it with ? The input sensitivity of the amp is 1.4V - you'd have to ensure that whatever you plugged into the power amp can deliver that for full whack. Quote Link to comment Share on other sites More sharing options...
discreet Posted January 19, 2014 Share Posted January 19, 2014 (edited) Drive it with a Tech-21 VT Bass... I just happen to have one for sale! Or drive it with a Zoom B3 - there's a whole thread on TB about using one with a Crown power amp. [url="http://www.talkbass.com/forum/f36/zoom-b3-preamp-936505/"]http://www.talkbass....-preamp-936505/[/url] I used a B3 with a Crown and if you're careful you can get some amazing results. Also used a VT Bass with a Crown and got some great results, too. Ampeg rig, anyone? Edited January 19, 2014 by discreet Quote Link to comment Share on other sites More sharing options...
Roland Rock Posted January 19, 2014 Author Share Posted January 19, 2014 The plan is to use the Preamp out from my Glockenklang Soul head. That should be ok, shouldn't it? All this separate pre/power stuff is new to me Quote Link to comment Share on other sites More sharing options...
discreet Posted January 19, 2014 Share Posted January 19, 2014 (edited) Have you got spec for the Glock regarding signal level from the Preamp Out? Edited January 19, 2014 by discreet Quote Link to comment Share on other sites More sharing options...
Roland Rock Posted January 19, 2014 Author Share Posted January 19, 2014 I can't see see anything in the spec, will have a proper search later Quote Link to comment Share on other sites More sharing options...
ahpook Posted January 19, 2014 Share Posted January 19, 2014 (edited) there's an interesting article on input/output levels and pre- & power amps at [url="http://www.ovnilab.com/articles/preamp.shtml"]ovnilab[/url] Edited January 19, 2014 by ahpook Quote Link to comment Share on other sites More sharing options...
Roland Rock Posted January 19, 2014 Author Share Posted January 19, 2014 [quote name='ahpook' timestamp='1390147722' post='2341927'] there's an interesting article on input/output levels and pre- & power amps at [url="http://www.ovnilab.com/articles/preamp.shtml"]ovnilab[/url] [/quote] Thanks for that, a very interesting read. Unfortunately, I can't find any info on the output of the preamp of the Glockenklang :-( The head has a 1/4" Preamp Out socket as well as a balanced DI with level control. I'm thinking it should be OK Quote Link to comment Share on other sites More sharing options...
discreet Posted January 19, 2014 Share Posted January 19, 2014 I don't think you'd damage anything by trying it. Either it'll work OK or it won't. Quote Link to comment Share on other sites More sharing options...
ahpook Posted January 19, 2014 Share Posted January 19, 2014 [quote name='Roland Rock' timestamp='1390163521' post='2342238'] Thanks for that, a very interesting read. Unfortunately, I can't find any info on the output of the preamp of the Glockenklang :-( The head has a 1/4" Preamp Out socket as well as a balanced DI with level control. I'm thinking it should be OK [/quote] It's quite tough to get concrete figures for the outputs for musical gear sometimes ! I have two Ampeg preamps and even their output levels are different, so even the manufacturers seem confused. Quote Link to comment Share on other sites More sharing options...
ahpook Posted January 19, 2014 Share Posted January 19, 2014 [quote name='discreet' timestamp='1390163696' post='2342243'] I don't think you'd damage anything by trying it. Either it'll work OK or it won't. [/quote] absolutely ! suck it and see....as it were Quote Link to comment Share on other sites More sharing options...
LukeFRC Posted January 19, 2014 Share Posted January 19, 2014 send 2x18 a message - he's got some experience with that power amp I think.... Quote Link to comment Share on other sites More sharing options...
Roland Rock Posted January 19, 2014 Author Share Posted January 19, 2014 Ok will do thanks Quote Link to comment Share on other sites More sharing options...
Roland Rock Posted January 20, 2014 Author Share Posted January 20, 2014 2x18 had some great advice. In the event that the pre output and power input voltages don't match, you can get a box (Art Clean Box Pro) which will do the matching for you. In the meantime, I've written to Glockenklang to try and get the info. Quote Link to comment Share on other sites More sharing options...
Roland Rock Posted January 20, 2014 Author Share Posted January 20, 2014 (edited) If antone is interested, here's the response from Glockenklang: [color=#000000][font=monospace][size=3]Hi Chris,[/size][/font][/color] [color=#000000][font=monospace][size=3]the output level of the pre amp out is 1 V, when the power amp starts[/size][/font][/color] [color=#000000][font=monospace][size=3]clipping.[/size][/font][/color] [color=#000000][font=monospace][size=3]If you only use the extern power amp, it is no problem, because the pre amp[/size][/font][/color] [color=#000000][font=monospace][size=3]out is able to send up to 5 V.[/size][/font][/color] [color=#000000][font=monospace][size=3]Best regards,[/size][/font][/color] [color=#000000][font=monospace][size=3]Udo Klempt-Gießing[/size][/font][/color] Kudos to Udo, who answered my e-mails promptly and thoroughly Edited January 21, 2014 by Roland Rock Quote Link to comment Share on other sites More sharing options...
BassTractor Posted January 20, 2014 Share Posted January 20, 2014 Sorry mate, Antone just went home. But I'll be seeing him later this evening, and will let him know. (couldn't resist) Quote Link to comment Share on other sites More sharing options...
0175westwood29 Posted January 20, 2014 Share Posted January 20, 2014 what are you actually doing other than killing people if they get to close? andy Quote Link to comment Share on other sites More sharing options...
Roland Rock Posted January 21, 2014 Author Share Posted January 21, 2014 [quote name='0175westwood29' timestamp='1390259199' post='2343390'] what are you actually doing other than killing people if they get to close? andy [/quote] [size=4] It won't be a regular rig. I have two separate rigs, one super clean, and one valve old-school, each with a different 4 ohm cab. I had the opportunity to swap a spare head for the Crown power amp, so I thought why not go for a Power Rangers setup - each rig mighty in its own right, and you can put them all together if you want to destroy a city [/size] [size=4] [/size] Quote Link to comment Share on other sites More sharing options...
Ghost_Bass Posted January 21, 2014 Share Posted January 21, 2014 (edited) I may have misundertood your question but from what i read i believe that you wont be able to run two 4Ohm cabs from your XTI in the way you're thinking about doing it! Your poweramp only has two operation modes (from what i read on the manual) Stereo and Mono/Bridge. - In Stereo mode you connect one signal to each channel and get up to 800W@4Ohm or 1000W@2Ohm on each channel. Since you only have a single input feed (signal from your preamp) you'll only be able to use one input from he amp so the only way to hook up two 4Ohm cabs is to hook them (in paralel) to the same channel thus obtaining a max output of 1000W with a 2Ohm load. If you try to hook a cab to each output one of them will not work. - In Mono/Bridge mode you have one input going on the amp and output from both channels (i won't explain how bridge mode works to keep it simple for now) but the minimum load that the amp will take is 4Ohms so you'll only be able to hook up one of your cabs, IF YOU CONNECT BOTH CABS IN BRIDGE YOUR AMP MAY BURN!!! There is a simpler way to do what you're looking for but from the manual your amp doesn't seem to be able to do it: running the amp in Mono/Parallel mode would solve your problem and you could work with one input and two outputs on the amp and still use two 4ohm cabs. Unfortunetly the manual doesn't say the amp is capable of doing it. Cheers Edited January 21, 2014 by Ghost_Bass Quote Link to comment Share on other sites More sharing options...
Roland Rock Posted January 21, 2014 Author Share Posted January 21, 2014 (edited) [quote name='Ghost_Bass' timestamp='1390300179' post='2343645'] I may have misundertood your question but from what i read i believe that you wont be able to run two 4Ohm cabs from your XTI in the way you're thinking about doing it! - In Stereo mode you connect one signal to each channel and get up to 800W@4Ohm or 1000W@2Ohm on each channel. Since you only have a single input feed (signal from your preamp) you'll only be able to use one input from he amp so the only way to hook up two 4Ohm cabs is to hook them (in paralel) to the same channel thus obtaining a max output of 1000W with a 2Ohm load. If you try to hook a cab to each output one of them will not work. [/quote] The way I read the manual, I thought I could use this mode: • INPUT Y (Ch. 1 input signal goes to Ch. 1 and Ch. 2 output. Ch. 2 input signal is ignored.) I've e-mailed Crown to confirm. Thanks for the heads up Edited January 21, 2014 by Roland Rock Quote Link to comment Share on other sites More sharing options...
Ghost_Bass Posted January 21, 2014 Share Posted January 21, 2014 [quote name='Roland Rock' timestamp='1390301378' post='2343664'] The way I read the manual, I thought I could use this mode: • INPUT Y (Ch. 1 input signal goes to Ch. 1 and Ch. 2 output. Ch. 2 input signal is ignored.) I've e-mailed Crown to confirm. Thanks for the heads up [/quote] I'll check that again on the manual Quote Link to comment Share on other sites More sharing options...
Ghost_Bass Posted January 21, 2014 Share Posted January 21, 2014 [quote name='Roland Rock' timestamp='1390301378' post='2343664'] The way I read the manual, I thought I could use this mode: • INPUT Y (Ch. 1 input signal goes to Ch. 1 and Ch. 2 output. Ch. 2 input signal is ignored.) I've e-mailed Crown to confirm. Thanks for the heads up [/quote] Yep, found it on the manual, it looks like this is the Parallel/Mono mode i talked about on my first post so this might work with two 4Ohm cabs but it doesn't hurt to check with Crown (Peavey) first Quote Link to comment Share on other sites More sharing options...
Roland Rock Posted January 21, 2014 Author Share Posted January 21, 2014 (edited) [quote name='Ghost_Bass' timestamp='1390303007' post='2343693'] Yep, found it on the manual, it looks like this is the Parallel/Mono mode i talked about on my first post so this might work with two 4Ohm cabs but it doesn't hurt to check with Crown (Peavey) first [/quote] Yup, thanks. Here's hoping there's no nasty surprises in the response Edit - Crown have conformed that all is well with my evil plan to put 800w into each 4ohm cab with a single input. Anyone else want to throw a potential spanner in the works? Edited January 21, 2014 by Roland Rock Quote Link to comment Share on other sites More sharing options...
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