Most speakers are just lumped into some category like 4ohm or 8ohm nominal and for most, this is fine. Most speakers will be all over the place depending on frequency. The LS-50s are 8 ohm speakers from the manufacturer, but any internet forum warrior is going to warn you abut the sub 4 ohm dip etc. Anyways, back to bridging, the LS-50s like a lot of power. You may be listening at 1W 99% of the time, but as audio is logarithmic, turning it up, in a medium or large room, and with transients, could easily benefit from the A300s bridged. That said, how an amp sounds during clipping is a huge thing. It probably sounds terrible with Class D, but tubes and the JLH 1969 Nobsound Class A 10-15W amp, the clipping is audiophile heaven
Thanks.Most speakers are just lumped into some category like 4ohm or 8ohm nominal and for most, this is fine. Most speakers will be all over the place depending on frequency. The LS-50s are 8 ohm speakers from the manufacturer, but any internet forum warrior is going to warn you abut the sub 4 ohm dip etc. Anyways, back to bridging, the LS-50s like a lot of power. You may be listening at 1W 99% of the time, but as audio is logarithmic, turning it up, in a medium or large room, and with transients, could easily benefit from the A300s bridged. That said, how an amp sounds during clipping is a huge thing. It probably sounds terrible with Class D, but tubes and the JLH 1969 Nobsound Class A 10-15W amp, the clipping is audiophile heaven
Let's know what you find when using it with AR3.
Well they sound great with the AR3. After the few 20 minutes or so they don't seem to be heating up to any excessive level. I'll check them in an hour and see where they're at. The 3's love power, so this could be a good match for them.
I am running my A300s bridged in a room that goes to about as high as 80 ambient (the amps get as warm as low to mid 90s depending on where measured), I have them stacked, but with 4 1" discs between the 2 amps. The amps are never hot to the touch, just warm ~ low to mid 90s F, but I feel the spacers aren't hurting. This is a room that I don't feel comfortable running the PA5 in, I use that amp in a room that is usually 3-4 deg cooler due to the house/ac/ducting design. I could try the Fosi v3, but there's no sub option, so likely to keep the pair of A300s where they are, as they sound great, and the other amps are fine with their stereo only outputs.
). I’ve been demo’ing it with the stock psu for the past hour, after having spent the morning listening to the A300. Again, what follows is highly subjective, and specific to my room and Elac Dbr62 speakers, but this is what I’ve noticed so far:Getting the V3 later today. I was hoping I’d be able to use the extra power from the A300 bridged to drive these 4ohm speakers without straining the amp and looks like they’ll be ok given my volume needs are very conservative.
I would guess dependent on not only quality of amp but how hard and long it’s being driven. In my case, not terribly hard and I not terribly long(I tend to switch between my several amps/speakers quite a bit). I checked it a few times when I was doing it and it stayed mostly warm to touch.
Thanks for the excellent review.As an update, I finally received the Fosi V3 ( delivery was delayed and I’m still waiting for the 48v power supply
1. The A300‘s sound is, for lack of a better term, “fuzzier” than the V3’s. On the V3, I find it’s easier to identify which speaker a particular sound/instrument, say hi-hats, or bass guitar strumming, is coming from. I’m more impressed by the clarity of the V3 - with a caveat; see point #3…
2. The bass on the A300 is louder (I’m guessing because the A300 has more wattage available at the moment), but it comes across to me as more taut and clean on the V3. On tracks with serious distortion ( like on the song “White Horses” by LOW) I find those distortions to be better described/ more interesting in detail - I’m not sure how to better explain this last part, I’m not a fan of heavy distortion, usually, and on my Loxjie and the A300 I wasn’t as enthralled by the details in this track’s distorted sounds as I have been on the V3.
3. The V3 is much more fatiguing because of the above. The A300 comes across as less in your face even at loud volumes - so much so that I had started to play with the tone controls and ended up adding 2 points of treble and taking away 1 point of bass - so, I agree that in comparison it is a smoother listen and I find I can listen for longer because of it.
Once I get the other power supply, I’ll do another round of listening and see what, if anything, changes.
What speakers are you using? The V3 is very good, but not at all soft, and I'm using it with 4ohm AR3's which are a difficult load and often thought of as quite dark sounding speakers. Not my experience in general, and with the V3 not at all. If you're using more mellow speakers, particularly 4ohm, the V3 is probably worth at least a trial, particularly if you get the 48v power supply.
Thanks for your suggestions. Considering RA 3, it would be ok for my speakers as the A300 is, but no EQ.
Thanks. Using Gallo Classico 4's. Specs in above post. I have the V3 on order from Fosi with the 48v PS. Only $99 with 48v PS! Purported "brightness" of V3 could help. I love SDB on A300, easy to tweak.
I'll be interested in hearing your thoughts. But I would bet that the V3 will match well with your speakers.
