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05-08-2008, 05:35 PM
|  | Registered User | | Join Date: May 2004 Location: State college, PA | | | 18v preamps are mean
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Bah, my new bass has an 18v preamp, annoying thing is some pedals really don't like those. My autowah acts like its peaked out all the time, like it's at is maximum threshold before exploding at all times...what a doozie.
It's annoying because if anything I was going to switch out the basses pickups first but perhaps it'll be a 9v preamp first...
that's my story for the day.
Last edited by Oreomeister365 : 05-08-2008 at 05:44 PM.
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05-08-2008, 05:37 PM
|  | Registered User | | Join Date: Nov 2005 Location: Wake Forest, NC | | | If it is a Bartolini, Audere or a Demeter, they will run on 9 volts which will reduce the output gain.
Last edited by CrashClint : 05-08-2008 at 06:28 PM.
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05-08-2008, 05:40 PM
|  | OVNIFX
EXAR pedals rep for North & Central America | | Join Date: Oct 2005 Location: PDX, OR | | Quote:
Originally Posted by Oreomeister365  my new bass has an 18v preamp, annoying thing is some pedals really don't like those. ...I was going to switch out the basses pickups first but perhaps it's be a 9v preamp first. | OK, but first be aware that different preamps will have different output levels regardless of the number of batteries. It sounds like the one you've got uses the extra voltage to create a hotter output, but not all do. There are some 9V preamps that have hotter output than some 18V preamps. The voltage can be designed in to provide lower noise, lower distortion, or longer battery life (instead of higher output). It depends on the specific preamp design. |
05-08-2008, 06:07 PM
| | Registered User | | Join Date: Dec 2006 Location: Fort Myers, FL | | Its really great that some people that have the slightest idea of what is going on with electricity and guitars in general still post on this forum.
Thank you bongo for filling the void.
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05-08-2008, 06:56 PM
| | | | my carvin has an 18v preamp. i dont know why anyone would do that to a bass. it makes your signal so hott that itll make anything clip, its a real pain. 9v is much more friendly with everything.
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05-08-2008, 07:09 PM
| | Registered User | | Join Date: Dec 2006 Location: Fort Myers, FL | | | psst, it could be a 600v preamp and it would make no difference, it depends on how the circuit is designed. Which is why I congratulated bongo for actually researching the subject. |
05-08-2008, 08:20 PM
| | You can't be angry ALL the time! | | Join Date: Mar 2008 Location: Minneapolis, MN | | | I've got a 18v preamp and I'm thinking of hooking it up to an OptoStomp. It has a -15db pad and I'm eager to see if it stops my LM1 from clipping.
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05-08-2008, 08:29 PM
|  | Registered User | | Join Date: Jul 2006 Location: Columbus, Ohio | | | How is your preamp wired? Is it boost only or is cut/boost? If you can cut it try to run it flat or maybe even bypass it altogether. Does it have a bypass switch? As stated earlier, you could also try taking a battery out and run it at 9 volts. It's not the end of the road. There's plenty of options you have with that bass and your effects. I ONLY use 18v pre's and have never had a problem with them. I especially like the Bartolini NTMB since it's very versatile and really pushes the tone out. I've had a lot of problems with passive basses and losing head room.
Hope I could shine some light on the situation.
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05-08-2008, 08:29 PM
|  | Registered User | | Join Date: Sep 2005 Location: The Jersey Shore | | | _____ is directly proportional to _____ and inversely proportional to _____, which is somewhat why 18v does not always mean louder. I think I am on the right track here......ohm's law anyone? hehehe just poking fun.
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05-09-2008, 12:13 AM
| | Registered User | | Join Date: Sep 2005 Location: Ribwich, ZF | | Quote:
Originally Posted by bongomania OK, but first be aware that different preamps will have different output levels regardless of the number of batteries. It sounds like the one you've got uses the extra voltage to create a hotter output, but not all do. There are some 9V preamps that have hotter output than some 18V preamps. The voltage can be designed in to provide lower noise, lower distortion, or longer battery life (instead of higher output). It depends on the specific preamp design. | Quote:
Originally Posted by astralis psst, it could be a 600v preamp and it would make no difference, it depends on how the circuit is designed. Which is why I congratulated bongo for actually researching the subject. | This is correct. I've had passive, 9V, and 18V basses in the past, and the overall volume was not determined by the number of volts. I once had a Lull bass with Aguilar 18V preamp that was the same volume in active and passive modes, as in not incredibly loud.
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05-09-2008, 05:21 AM
| | Registered User | | Join Date: Nov 2005 Location: Wake Forest, NC | | | I think my Whirlwind DI has -10 and -20 pad. If you go into one of these first, it will reduce your signal enough to stop the clipping. |
05-09-2008, 02:17 PM
|  | Registered User | | Join Date: Jan 2007 Location: Los Angeles, CA | | | Does your 18v preamp not come with a volume knob?
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05-09-2008, 02:29 PM
| | | Quote:
Originally Posted by bongomania OK, but first be aware that different preamps will have different output levels regardless of the number of batteries. It sounds like the one you've got uses the extra voltage to create a hotter output, but not all do. There are some 9V preamps that have hotter output than some 18V preamps. The voltage can be designed in to provide lower noise, lower distortion, or longer battery life (instead of higher output). It depends on the specific preamp design. | +1... also, many preamps have an internal volume control to adjust the output volume. | | Thread Tools | Search this Thread | | | | 
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