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Scrie un subiect nou Răspunde la subiect  [ 9 mesaje ] 

4 or 8 Ohms
4 30%  30%  [ 14 ]
8 70%  70%  [ 32 ]
Voturi totale : 46
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 Subiectul mesajului: 4 or 8 Ohms ?
MesajScris: Lun Ian 30, 2006 3:51 pm 
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would it be a good idea to keep the impedance at 8 0hms or would you rather tend to 4 Ohms?


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 Subiectul mesajului:
MesajScris: Lun Ian 30, 2006 3:55 pm 
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I was thinking of going for 16 ohms/ 4 ohms switchable, fo use with as many units /channel of amplifier (16 ohm wiring) 8) or 4 ohms, for single or pair usage

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ing. Mircea Bartic
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www.poweraudio.ro
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 Subiectul mesajului:
MesajScris: Lun Ian 30, 2006 6:30 pm 
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I would go for 4 Ohms, i see no real use for 4/16 Ohm switching.
Offcourse i understand that it would save some expensive amps, but why would you build cab's, that are not cheap too, if you have no amps for them.
Why would you place 4 high power cabinets a side, and power them with only forinstance 150 Watt each? (on a 600W/4Z amp)

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 Subiectul mesajului:
MesajScris: Lun Ian 30, 2006 6:51 pm 
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16 Ohms would mean very powerful amps (i.e.a 300W speaker = 600W/16 =
1200W/8 = 2400W/4 at the very least. or bridged amps?
4 ohms means you need a second amp as soon as you have more then two, which is the minimum config for a 40°x40°-Top.
at 8 Ohms you could easily drive three (2,7 Ohm) with a 2x 1k5 amp. the problem is, the choosen driver must be available in 4(or 16)Ohm-Version.


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 Subiectul mesajului:
MesajScris: Mie Feb 01, 2006 8:10 pm 
Yeah,

i'd be tempted to go for 8 ohms for flexability. My view of this cab is that it will be used in at least pairs, hence its narrow 40 deg or whatever dispersion.

4 ohms would mean as soon as you had the two cabs you would need more amps, and 16 would mean hugely powerfull amps.

8 ohms would mean that you could run anywhere between 2 and 4 per side from the one amp, with half decient power.


kev


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 Subiectul mesajului:
MesajScris: Mie Feb 01, 2006 8:41 pm 
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that means we'll need 16 ohm or 4 ohm speakers, which are not too easy to find theese days.... :roll:

_________________
ing. Mircea Bartic
Director general

Poweraudio Romania
Str. Gheorghe Sincai, Nr.26 Bistrita
Telefon: 0766332366
E-mail: office@poweraudio.ro
www.poweraudio.ro
facebook.com/poweraudio.romania


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 Subiectul mesajului:
MesajScris: Mie Feb 01, 2006 9:37 pm 
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fane will do you a 4 or 16 ohm variant of pretty much all of their cones if i'm not mistaken, but as they aren't the most universaly available of drivers and certainly can't compete with the likes of p audio for pricing, i hadn't given any a go.

i was then pretty much resigned to having a 4 ohm low mid section and the pain about that is you will have to add an amp channel if you go to three a side. with an 8 ohm top end with a good passive crossover you could stretch to three tops on one channel so the impact on rack space and cost isn't too bad. an extra top end amp is only required when you go to four cabs a side.

james.

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 Subiectul mesajului:
MesajScris: Mie Feb 01, 2006 10:39 pm 
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p-audio makes 4 and 16 ohm versions of their speakers, but you have to be the importer to request those versions.

in the next import (march) I'll have some 16 ohm and some 4 ohm drivers, but unfortunately, none suitable for this design

maybe proadioparts would agree to bring you (UK members) a 16 ohm version of sn12Mb or c12-300MB, but that will take at least 3 months :roll:

_________________
ing. Mircea Bartic
Director general

Poweraudio Romania
Str. Gheorghe Sincai, Nr.26 Bistrita
Telefon: 0766332366
E-mail: office@poweraudio.ro
www.poweraudio.ro
facebook.com/poweraudio.romania


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 Subiectul mesajului:
MesajScris: Joi Feb 02, 2006 1:11 am 
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Membru din: Mie Noi 16, 2005 8:18 pm
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i fugure it's not worth it, bearing in mind we want around 1k of amp per pair of 12"s (at least that's the figure i'm working to for the b&c) that is going to be most space and cost effectively achieved with a 4 ohm load. otherwise, to drive three cabs you'd need something that gave 3000 W into 2.6 ohms.

4 ohms is fine.

james.

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