New kid on the block
Anyone with experience paralleling Amp9 outputs?
In picking up where the bridging thread left off, has anyone actually tried paralleling two or more input/output combinations on an Amp9 to increase the current (amperage) capacity for low impedence loads?
If so, were there any issues - oscillation, DC offset, current loops, overheating...anything? Thanks in advance for any shared experiences.
Knight of the Solder Iron
I did a few times, there was only one time an issue because I used inferior plugs, the amp went into protection. But it wasn't broken, after the connections were made proper the amp worked fine again....
It's easy to do, there are no mods necessary, just connect the input wires of the desired channels together and than connect the output channels together the same way... (+to+ and -to-).
It did have an effect on the sound. For my ESLs it wasn't so pretty, but for dynamic speakers it seemed to add a lot more control. Plus the bonus of being able to drive insane loads....
No overheating problems either, no difference....
------X-max. can be several meters on any driver, too bad it can be done only once...------
Member++
I have a dream of a dual 2ohm voice coil subwoofer running off an amp9b with either 2 or 4 paralleled outputs.
Knight of the Solder Iron
That's a very good idea, especially the bass benefits from the extra control....
------X-max. can be several meters on any driver, too bad it can be done only once...------
New kid on the block
Great! Thanks for the feedback! I've already blown one Amp 9, so I'm trying to be more careful with this one.
Knight of the Solder Iron
When paralleled you can even connect two of those....quote:Originally posted by y8s
[br]I have a dream of a dual 2ohm voice coil subwoofer running off an amp9b with either 2 or 4 paralleled outputs.
------X-max. can be several meters on any driver, too bad it can be done only once...------
Member++
With a 24VDC supply? I thought it was only rated 4x100W at 4ohm max. If I use the dual voice coils, that's two 2 ohm loads or one 1 ohm load.quote:Originally posted by V-bro
[br]When paralleled you can even connect two of those....quote:Originally posted by y8s
[br]I have a dream of a dual 2ohm voice coil subwoofer running off an amp9b with either 2 or 4 paralleled outputs.
or maybe I could run eight 8 ohm woofers in parallel!! [)]
Knight of the Solder Iron
If it's growing too heavy the overcurrent protection will trip.
No indeed it is 4x100 at 4 ohms, but 2x200 parallelled it's 2 ohms stable and 1x400 it's 1 ohm stable....
Do keep in mind that for the extra gain you need the lower impendace, otherwise it'll stay the same gain (at the same load). The extra power is only current, not voltage....
------X-max. can be several meters on any driver, too bad it can be done only once...------
New kid on the block
Actually, I think it was Jan that pointed out that the real limit is the amount of peak current you push - 10A/channel - that trips the overcurrent protection. I actually was able to get 11A rms for a 2 minute period of time; that, of course, was the last time....
Nonetheless, I would say that you're safe pushing a 2 ohm load w/24V, providing that your bass content is limited, i.e. the bass drum beat, and not rms content. With 12V, I would guess (since I can't say I've tried this) that you could get away with a 1-ohm load/channel, but parallel two to be safe. Can you say, "Subwoofer Line Array?"
Knight of the Solder Iron
It sounds like fun, but I'm not sure there's going to be much benefit using this for a Subwoofer. The enhanced imaging and spatial separation these amps are known for is lost on this type of application, since a sub is mono and non-directional in output.
On the other hand, if you're just looking for a fun project to experiment with amps and speakers, then you have come to the right place.
***If it was easy, everyone would be doing it***
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