I was looking for a Yamaha A-S 301. Will be ok with DBR62? Low/medium volume (85db max)Cheap class D amps tend to be unstable with certain loads, and that sometimes manifests itself in overly prominent highs. My A07 sounds fine with my ATC SCM19v2, but not so good with my Mission LX-.3 MKII.
If you get an opportunity, borrow a class AB amp from friends or buy one. You may find that they sound a lot better with your particular load.
A friend of mine in the US got a Yamaha R-S700 for $120 recently, he said his speakers sounded different to him now, more bass, more body, less harsh. It's a very solid amp, even at $200. If you are in Europe, 160€ to 220€ is realistic for the R-S700.
If you are interested in AB amps, we have a thread called "Inside Yamaha amps" where you can look inside them. Denon, Marantz, Rotel and other AB amp manufacturers look very much the same.
I think so, yes. But remember that eventually you might want to go to different speakers, i would go for a the A-S 701 right now.I was looking for a Yamaha A-S 301. Will be ok with DBR62? Low/medium volume (85db max)
We are developing a switcher Fosi Audio LC30.What is a good RCA input switcher for this amp?
Perfect.We are developing a switcher Fosi Audio LC30.
Audio quality is important but keeping the amp running comes first. I suspect that you run your devices in a cool indoor environment at a comfortable volume for a personal listening stage. In our use, we run our Fosi BT30 pro (a dual 3255) at high volume in an outdoor humid 29-30 c setting near the ocean for hours. In our situation, heat is an issue. We drilled out the case to avoid problems with extended play. Besides avoiding heat shut down we also want the amp to last and prefer not to cook the components any more than necessary.....
But none of the Fosi products that I own and have also used extensively have ever failed, even in very small cases, so again, why insist on solving a non-problem?
At the moment this version, as far as we know, responds more to a marketing need, in satisfying some users who would feel reassured by greater heat dissipation which at the moment does not seem justified by overheating problems of any Fosi unit. my acquaintance.
If beyond this the measurements will also show good benefits in terms of audio quality then it will be a different matter, but at the moment we don't know it (nor should we assume it)
Forgive me if my answer is trivial.Audio quality is important but keeping the amp running comes first. I suspect that you run your devices in a cool indoor environment at a comfortable volume for a personal listening stage. In our use, we run our Fosi BT30 pro (a dual 3255) at high volume in an outdoor humid 29-30 c setting near the ocean for hours. In our situation, heat is an issue. We drilled out the case to avoid problems with extended play. Besides avoiding heat shut down we also want the amp to last and prefer not to cook the components any more than necessary.
I also wonder how long you have used Fosi 3255 based devices that have not ever failed. That is, are you concluding that after 16 months of medium volume use in a cool environment that you have good enough idea of longevity over years in high volume high heat environment? Sufficiently robust testing to criticize Fosi for improving their approach to cooling?
I appreciate your perspective overall but question if these are not assumptions based on somewhat ideal usage over relatively short time period.
Would love to see similar test @ 80 F.I just received my BT20A Pro with the 48V supply. After playing for 2 hours at full volume on the BT20 at about 83 dBc with B&W 602s, the power supply was at 63 degrees F and the amp case was at 81 degrees F. The room temperature was 61 degrees F (my cellar). Hope this helps.
Hi- Yes I saw that Fosi said they tested for overheating. Rather than a general statement I would prefer to hear "We tested this product at this power output for this long at these ambient temperatures and measured these temps here and here" So that the testing would include full acceptable range ambient temp usage and not just optimal or typical temps as a skeptic might suspect.Forgive me if my answer is trivial.
But what are your reasons for inferring with absolute certainty that we need precautions against the heat?
Fosi audio in this same thread to a specific question replied that tests were performed at high volume for a long period of time without problems (sorry but I don't want to go looking, you can check yourself if you feel like it).
As long as there is no feedback indicating possible issues there is no reason to assume there will be any.
Still on the Aiyima a07 3255, despite the thousands of units sold, there do not seem to be any major reports of failures due to overheating.
So again. You are trying to remedy a problem that simply does not currently exist.
1) We have had our Fosi dual 3255 amp shut down on us when using in our public situation as described before. Very embarrassing. The case was very hot. A short wait with the amp turned off allowed it to return to operation. For the next event, we blasted a fan on the closed case and had no problem. I decided to drill ventilation holes and have not had an issue since.
I believe that the problem is not the thermal resistance of a small 100 euro domestic amplifier.In our use, we run our Fosi BT30 pro (a dual 3255) at high volume in an outdoor humid 29-30 c setting near the ocean for hours. In our situation, heat is an issue
its amazing to me that people would push a $100 amp outside of its operating design
I think so, yes. But remember that eventually you might want to go to different speakers, i would go for a the A-S 701 right now.
Check out Hifishark for used deals, only fools pay retail.
You need to understand that these differences you've perceived are very unlikely to be real, either the treble on Class D or the "boomy" bass on Class AB.I tried the AS 301. I can tell that I really don't like it. Yes, with class AB the tweeter sounds better and the voices are better, but the bass is dry and if I raise it with the potentiometer it becomes just boomy (elac debut reference). With Fosi TB10D is punchy and fast, just perfect. To get the same bass with a class AB I think I should spend at least double what I paid for the AS 301.