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06-09-2010, 07:58 PM
|  | I play the electric tuba. | | Join Date: Sep 2004 Location: Cleveland | | | To bridge or not to bridge?
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Setup: Mackie 1400i, one channel, 250 watts into 8 ohms.
Avatar compact single 15" Eminence Kappa (400 watts?)
The simple question is if I go bridged into 8 ohms (850 watts), and am NOT overzealous with the volume, should my driver be OK?
I don't know if this cab is a "hungry" cab, liking higher wattage or not.
Thank you for the input. |
06-09-2010, 08:39 PM
|  | Registered Bass Offender | | Join Date: Nov 2007 Location: Cambria, CA (Central Coast) | | | You can, but you'll need a dual-banana plug cable for the amplifier end. And whatever connector the cab needs on the other.
Also, be advised that gain controls DO NOT limit power output. A gain control only sets the required INPUT to get FULL power output. So, even with the gain less than full, a good slam on your bass can still put out close to full power.
How about this: Try running one side of the amp and see how it sounds. Why start guessing before you even know what you've got?
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My usual stock answers: No, Tuesday, 12
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06-10-2010, 06:01 AM
| | I play the electric tuba. | | Join Date: Sep 2004 Location: Cleveland | | | Hmm. More to mentally chew. Thanks for the input! |
06-10-2010, 06:27 AM
|  | Registered User | | Join Date: Dec 2002 Location: Virginia Beach, VA | | | Sure, try the single channel first then repeat in bridged mode. I use a similar set-up: two RMX 1450's (bridged / ~800 watts @ 8 ohm) into two middle-of-the-road Carvin 1503's rated @ 400 watts. From what I've read, this is an efficient method of powering a single 8 ohm enclosure and meets suggested power requirements ( 1.5 - 2 X cab's RMS rating). Disclaimer: some will question the stability of a power amp in bridged mode....I've never had a problem.
Riis
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"20% of the money will buy you 90% of the sound..another 30% of the money will buy you another 5% of the sound..you can't buy the remaining 5% of the sound because nobody can agree about what it is." |
06-10-2010, 07:05 AM
| | I play the electric tuba. | | Join Date: Sep 2004 Location: Cleveland | | | ZOOB, THANKS FOR THE INFO. |
06-10-2010, 07:09 AM
| | Registered User | | Join Date: May 2008 Location: triad, nc | | | nah... the 1400i will have no trouble running into 8 ohms bridged for the rest of its life. that amp is stable at low impedances. just make sure there is adequate ventilation, since theyve got the stupid stupid side exhaust vents. some rack cases are just too tight.
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Originally Posted by blipndub  Who cares what sticker he puts on his pos bass. He could put an STP sticker on it and some nascar fan would get all bent out of shape. | |
06-10-2010, 07:21 AM
| | I play the electric tuba. | | Join Date: Sep 2004 Location: Cleveland | | | Toob, I discovered that issue with my rack. (SKB) It's only got about 1" of clearance where the side vents are. The airflow seems to be fine, and I doubt highly if I'll EVER drive this thing hard enough for thermal issues to crop up. |
06-10-2010, 07:27 AM
| | Registered User | | Join Date: Dec 2002 Location: Virginia Beach, VA | | Quote:
Originally Posted by Kawai-chang ZOOB, THANKS FOR THE INFO. | You're more than welcome. I need to clarify one issue: the warnings I read re: amp stability were based on bridged configuration feeding a 4 ohm load, not 8 ohm. Once again, guilty as charged. I use an RMX 2450 in bridged mono to power two daisy-chained 8 ohm 18" subs.
Riis
__________________
"20% of the money will buy you 90% of the sound..another 30% of the money will buy you another 5% of the sound..you can't buy the remaining 5% of the sound because nobody can agree about what it is." |
06-10-2010, 07:46 AM
| | I play the electric tuba. | | Join Date: Sep 2004 Location: Cleveland | | | Zoob, reading the manual for my amp, I don't see any issue with running it bridged at 8 ohms. The manual states the amp is stable down to 2 ohms, so I think I'll be well within safe operating parameters. |
06-10-2010, 08:48 AM
| | Registered User | | Join Date: May 2008 Location: triad, nc | | | per channel.... but bridged, you arent going to want to run it below 4 ohms.
__________________ Quote:
Originally Posted by blipndub Who cares what sticker he puts on his pos bass. He could put an STP sticker on it and some nascar fan would get all bent out of shape. | |
06-10-2010, 09:07 AM
| | I play the electric tuba. | | Join Date: Sep 2004 Location: Cleveland | | | Toob, you are correct. I would not run it below the 4 ohm level. |
06-13-2010, 10:31 AM
| | | Quote:
Originally Posted by Rick Auricchio Also, be advised that gain controls DO NOT limit power output. A gain control only sets the required INPUT to get FULL power output. So, even with the gain less than full, a good slam on your bass can still put out close to full power.
How about this: Try running one side of the amp and see how it sounds. Why start guessing before you even know what you've got? | yep believe it... i was playing moderate level thru a 410 at rehearsal and after a bit of a (rehearsal frustration moment) got mad and slapped the strings with my right hand..... (pop goes the speakers) and no more sound..well it was buzzy sound with no bass tone 1140 watts bridged thru a 400 watt 410 is not good
be very careful... and rule #1... never stomp on the gas pedal out of frustration | | Thread Tools | Search this Thread | | | | 
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