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Amplifier Value - Need Recommendations

Trollhammerx

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Mar 9, 2023
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Fairfax, VA
TLDR: Looking for value/budget recommendations for a 2 or 3 channel amp to run LCR and a 1000W X 2 amp to run subwoofers.

I just recently scored an amazing deal on a Denon X6700H ($1100 on prime day) to upgrade from a X3300. I now have the daunting task of trying to look for a 2 (or 3) channel amp to achieve the extra channels of processing on the receiver (has an 11ch amp, but can process 13 ch with the external amplification).

Firstly, I went to swap out the receiver with existing connections and discovered that no sound was coming from my Behringer 6000D that runs two sealed Ultimax 18s. The "protection" led was lit on the front. I had stupidly left this amp on running non-stop for a very long amount of time because it doesn't have a 12v trigger and I've been lazy on manually shutting it down (I won't be in the future). Most troubleshooting advice I can find is that the Behringer is cooked.

So this is causing me to really dive into a few solutions and I find that amplifiers are much more difficult to understand where the fundamental value points are. I try to maximize my budget and determine an acceptable point of diminishing returns.

Optimally, I would like to get a 2 or 3 channel amplifier to run the main LR and center (which are currently KEF Q100s but am preparing to get Ascend Acoustics Sierra LX). I see prices all over the place from the small class d amps to outrageous flux capacitor looking amplifiers. Where is the best value add for this scenario? The Sierra LX says they are rated at 350W continuous, but I doubt I need to throw that much power at them. What would be a reasonable price point to compare solutions for this? I don't want to spend alot, but I do want something reliable. The monoprice or emotiva 2 or 3 channel amps seem ridulously expensive compared to these higher wattage Fosi amps I see on Amazon. Can someone help me understand where the value proposition is as the price increases on an equivalent wattage amplifier?

Additionally, I need to replace the Behringer 6000d (which is out of stock everywhere). Honestly it's not very good, but nothing else seems to come close to the value point. I want to push 1000W rms a channel (2 channels) into 4 ohm loads. I'm flexible on the wattage if the solution will be more reliable and have better features (I hate the pro connections and crazy line level voltage issues). Unbalanced RCA, standard speaker terminals, and factory cooling that doesn't need diy fan modification would be a godsend).

Thank you in advance for any advice. Cheers!
 
For LCR:
 
Hi, what sort of budget do you have in mind, and would you consider replacing your passive subs with active ones?
 
For LCR:
This is where I'm confused. I really don't want to spend this much if I don't need to. How is this product superior to the tonewinner AD8300 which has 3X300W plus 8X100W and it's just $200 more than the buckeye you linked?

From what I understand a watt is a watt, right? The buckeye at $1550 seems expensive to me for a 3 channel amp (i'm pretty cheap). For a comparison, I could get 3 Fosi V3 Mono amps for ~$350 and they are 120W/Ch at 8 ohms. I want to get the lowest cost solution that provides an amazing audio experience in my theater. What am I missing? Is there a reasonable low cost solution that doesn't sacrifice sound quality?
 
You are getting pretty good speakers and already have a very nice AVR. I would not choose entry level amps for the front trio if I were you.
 
You are getting pretty good speakers and already have a very nice AVR. I would not choose entry level amps for the front trio if I were you.
Why not.

The V3 mono will be audibly indistinguishable if they have sufficient power.
 
If you have very demanding main speaker, there are two options to drive them with such a high class AVR like this Denon:
One is trying to get a triple of amps that are better than the build in ones of the AVR, which may be quite expensive and not simple to find.
The other option, which I would prefer with something like the X6700h, is to get amps for all channels except LRC. In this case, the power supply for 9 amps has only to supply the 3 main channels. This will extremely increase the output capability to the LRC speakers and improve their sound quality. Anyone who had the opportunity to listen to the same amp with a weak supply, compared to an over sized one, will probably agree.
The Denon people know how to build good amps. So why get some questionable cheap Amazon amps from some cheesy Chinese no name manufacturer to replace them?

I use my Denon 4100 with 3 external stereo D-amps from the ASR list and like it very much that way. Only driving front and center with the AVR seems to have improved the dynamic's. I can turn up the volume until it hurts, without any distortion. Life music can be impressive in 5 or 7 channel. I must add, I have got three quite capable, identical speaker for the front row.

There is one point to remember, amps with external power supply can only perform as good as it feeds them.
I use a Meanwell 600 Watt, 48 Volt SMPS with a 5 second 1200W peak output for them. That should keep the TPA3255 chips happy with any kind of impulse. I don't think there will be any need for more than an easy thousand watts in the surround channels. Also, keep in mind, if you read the reviews on ASR, Amir only used some quite under powered, cost cutting supply, delivered from the manufacturer. With a more powerful SMPS the output power is higher and will reach the data sheets values at some point. You can not expect an amp to give 500 Watt output with a 240 Watt supply. Good amps have a supply that is more powerfull than the output, not the other way round. Also, output is limited by voltage. 36 Volt will get a much reduced headroom, compared to 48 Volt, which is the safe maximum for a TPA3255.

No need to mention that this can be a very inexpensive solution. After buying an AIYIMA A07 for another set-up, which had a surprisingly good sound, I got 3 AIYIMA A07 MAX, which look nice, 3 in a row. Not to forget the Meanwell LRS-600N2-48 supply to power them. The "N2" is the new version with 200% peak output for a few seconds. It also got an automatic fan, which only switches on with constant high load.
Buying on sale got me the whole combination for €220 /US$230. That makes 6 channels with more than enough Watt each. Even if the rated 300 Watt are a little optimistic. The TPA3225 data sheet promises 260 W/ 4 Ohm at 1% distortion per channel, if the power supply can provide it.

I already had some wired plugs for the amps PS, as you need 5.5*2.5mm male for it. You get them cheap at AliExpress, ready wired with 50cm 14awg. You need to get the DC inside the amps.
You may as well get one AIYIMA Audio GaN 48V 10A supply for each amp, if you want it from Aiyima plug&play. A bit more expensive, at 80$ each.
Maybe that gives you some idea.

PS These amps don't get hot, they stay at just a little more than room temperature.
 
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