Yeah, I'm well familiar with the data sheet and thermal and load considerations. This is not my first rodeo with the LM3886. I've built quite a few. 🙂
Regardless, the OP has identified the ultimate power limitation.....his wife yelling.....and it seems he has a good general understanding of the trade-offs here.
Cheers,
Dave.
I have converted my Pluto 2.1s to LX Mini.
I use the Pluto PCB LM3886 amplifiers (EQ taken out of circuit as per SL's modification instructions available to LX Mini builders). Performance is excellent. I am still using the amplifiers in the speaker bases .
I have used these amplifiers (previously in Pluto) since 2009. No problems even at very high levels.
SL made some tests on the Pluto amplifiers, the distortion figures were favourable, even compared to the recommended Emotiva amplifier.
You could buy the Pluto PCBs; follow the instructions for the modification and the LX Mini amplifier circuit diagram and you will see which components you have to load (and therefore which to list for purchase) for the amplifier sections.
Follow the modification advice for addition wire hook up and you're sorted.
Upgrading Pluto to LX Mini is well worthwhile and the amplifiers perform very well.
I use the Pluto PCB LM3886 amplifiers (EQ taken out of circuit as per SL's modification instructions available to LX Mini builders). Performance is excellent. I am still using the amplifiers in the speaker bases .
I have used these amplifiers (previously in Pluto) since 2009. No problems even at very high levels.
SL made some tests on the Pluto amplifiers, the distortion figures were favourable, even compared to the recommended Emotiva amplifier.
You could buy the Pluto PCBs; follow the instructions for the modification and the LX Mini amplifier circuit diagram and you will see which components you have to load (and therefore which to list for purchase) for the amplifier sections.
Follow the modification advice for addition wire hook up and you're sorted.
Upgrading Pluto to LX Mini is well worthwhile and the amplifiers perform very well.
Oh good, someone that actually has an LXMini with LM3886. Is there any difference between the section dedicated to the full range driver and the woofer?
Yes indeed. The woofer section uses a bridged (two) LM3886 setup and the tweeter section uses a single LM3886.
Dave.
note that this implies all three LM3886 will see loads that are effectively 4 ohms, which, in turn, drives PSU and thermal design.
You continue to side-track the discussion to (possible) thermal issues. 🙂
I'm assuming that cspirou understands the LM3886's need to be WELL heat-sinked in any case. His initial post indicates he is asking more basic questions regarding the configuration. It sounds to me like he now has a handle on the basic configuration and knows how to proceed.
Cheers,
Dave.
Guys, we don't moderate on technical inaccuracies unless there is obvious danger to others with regard to information posted. Argue out your points on technical merit, and don't make it personal.
Offending posts will be deleted.
my central point was that the bridge causes its LM3886s to see a 4 ohm load. this may or may not be obvious to readers. PSU and heat issues may be among the impacts. i see no technical inaccuracy here.
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As already stated: bridged to bass driver. Single LM3886 for treble as per Pluto amplifier specifications. I have not changed this.
I used considerably oversized heatsinks from the outset, at least compared to the reference design. Many users do this.
I will add to this that (as before with Pluto) the single LM3886 tweeter amplifier heatsink gets less hot than the bridged ones for the bass section. The difference is notably smaller now with LX Mini as the tweeter LM3886 heatsink gets considerably warmer than in Pluto.
Even though the amplifiers are fitted into a wooden box and the heatsinks are not as exposed as a typically audiophile amplifier none of the heatsinks get as hot as the heatsinks eventually do in a typical Class A amplifier for instance. You can touch these and hold your fingers there for a reasonable time (not comfortably but no flesh burns), unlike every Class A amplifier that I ever used.
You could cook yourself on a Class A Sugden or Musical Fidelity design.
Hypothetically if I was going to use these amplifiers to drive something else more power hungry I would consider uprating the transformer, other than that you would be good to go.
Dave, on my mini DSP 2x4 the relative volume control bars are grayed out so I can't set then differently. Is there an obvious mistake I'm making?
Mark
Mark
Mark,
Hmmmmm, maybe you could post a photo of that?
On the 2x4 plugin you should see vertical sliders which you can either drag or simply left-click and use your keyboard up/down arrows.
I hesitate to get off topic in this thread. 🙂 Dang!
Dave.
Hmmmmm, maybe you could post a photo of that?
On the 2x4 plugin you should see vertical sliders which you can either drag or simply left-click and use your keyboard up/down arrows.
I hesitate to get off topic in this thread. 🙂 Dang!
Dave.
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Why don't you restore the default configuration and reinstall your .XML file and see what happens. 🙂
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