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2x12" mid cabinet, bridged or mono ? |
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thanosvas 
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Joined: 18 June 2019 Status: Offline Points: 8 |
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 Topic: 2x12" mid cabinet, bridged or mono ?Posted: 06 July 2019 at 3:17pm |
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Hello everyone! I am about to build a 2x12" Mid cabinet for a reggae sound system. loaded with 8ohm drivers which I will wire them parallel in order to get a 4Ohm amplifier in bridge mono mode. However I recently heard that mid cabinets should be played at 8ohm because they sound a bit brighter. Is that right ? Should I drive them separately using 2 channels (8 ohm each) or it will sound 'worse' because of the 4ohm total impedance in parallel wiring ? Sorry if this question seems strange but I am a bit confused here. Thank you in advance ! :) |
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Conanski
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Joined: 26 January 2006 Location: Ottawa, Canada Status: Offline Points: 2543 |
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Posted: 06 July 2019 at 10:43pm |
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4ohms bridged = 2ohms per channel so yeah.. it can get a bit sloppy. Just how much power are you gonna try to cram through these poor "mids"? Unless the program material is really dynamic I don't see the drivers surviving much more than about 1kw per pair and there are lots of amps that can deliver that from a single channel at 4ohms.
Edited by Conanski - 06 July 2019 at 10:45pm |
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thanosvas
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Posted: 07 July 2019 at 10:03am |
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Specifically I am thinking to wire parallel 2x Fane Sovereign 12-300 and drive them with a Crown XLS 1002 amp in bridged mono (4Ohm). So I guess something like 600 watt RMS to 800-900 maximum power. Is it going to work like this or I am going to burn the amp?? :/ Edited by thanosvas - 07 July 2019 at 10:11am |
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JonB67
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Posted: 07 July 2019 at 1:07pm |
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Just looked up the 1002 spec, its 215w @ 8ohms.
Thats a bit low for what you want to do with it, In bridge mode at 4 ohms, each half of the amp is working at 2 ohms load, this is hard on the amp and can sound a bit loose. Truth is the amp is too small to comfortably do what you want it to do. Best to find a bigger amp capable of running one of these per channel at 4ohms. If you already have the amp try wiring it a speaker per driver and test it. If you need more power reconfigure to use bridge and start saving!
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Chris Grimshaw
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Joined: 10 September 2018 Location: Sheffield Status: Offline Points: 281 |
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Posted: 07 July 2019 at 4:01pm |
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If a pair of drivers are in a box together, I'd wire them in parallel for a 4ohm load. Use the other side of an amplifier to do something else. Maybe DJ monitors, or just as a backup. It isn't good practice to set up your rig with 2ohm on any amp channel (4ohm bridge counts as 2ohm on 2 channels), because it gives you nowhere to go if an amp goes down. There are some amps that will drive 2ohm, but I can't think of any that would actually be comfortable. By comfortable, I mean happily producing 2x the current (and therefore power) of 4ohm/ch. The Crown MA5002VZ, which is really well regarded for low-impedance use, goes from 2KW/ch into 4ohm to 2.5KW/ch into 2ohm. Hardly a worthwhile increase in power, and it indicates that the power supply is struggling. Even a Void Inf8 won't manage a 100ms burst that's double the 4ohm continuous rating. I'm not out to slate these amplifiers. They're good amps. It's just that 2ohm/ch is a really difficult thing to do. Chris
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Conanski
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Posted: 07 July 2019 at 8:00pm |
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That amp is too small for your mids but it's just about the perfect size for compression drivers.
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thanosvas
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Posted: 07 July 2019 at 8:45pm |
I totally get it now ! I will look for a bigger amp and avoid using bridged mode. I was totally confused before about this. Thanks for all the answers guys, it was really helpful :) Bless !
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bob4
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Posted: 08 July 2019 at 10:42am |
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If it is for mids though, say above 150-200 hz, the a p should be fine with 4 ohm bridge? Much less energy needed in the mid band to go loud, and the current draw should be less than doing sub and bass i would have thought. Also bridge mode would give twice the peak voltage.....
Why not try? I dont see any catastrophic danger
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gen0me
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Posted: 08 July 2019 at 2:57pm |
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Why would you want to run 1khz in mono?
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bob4
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Posted: 08 July 2019 at 3:00pm |
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Gen0me, you missed the bit that mentioned "Reggae sound system"......
  
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gen0me
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Posted: 08 July 2019 at 3:13pm |
  Hope it was changed into something with smarter dispersion Edited by gen0me - 08 July 2019 at 3:30pm |
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pfly
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Posted: 08 July 2019 at 7:01pm |
This! If that amp has any kind of 2ohm power spec, it means it should be able to handle 4ohm bridge with mid frequency signal as the RMS power and crest factor are going to be quite kind to the amp. I wouldn't worry about some possible sound quality loss, I think in application like this it will be mostly reaaally academic.
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Chris Grimshaw wrote: