Best budget 2-channel amp for home office?

armwt

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So not in a hurry to purchase, but contemplating upgrading my desktop sound system once I finally finish building out my home office.
I'm not an audiophile, but would like to be ;).

Current setup:
Boston Acoustics VR-M50 bookshelf speakers
• (spare set of VR-MX speakers that I may or may not use in the home theater, so potentially an extra set).
2x Velodyne Mini-vee subs
• (bought 2nd one for home theater, but may use it in the office instead)

Currently using Sabaj A4 class D amp, primarily fed via BT from my phone and computer.

I'm overall very happy with the amp, but thinking I'd like to upgrade it for a couple of reasons:
a) the display is next to impossible to read from anything further than 6 inches, and without a physical volume knob, a bit tricky to use without it sitting right next to me.
b) I'd like to add my turntable to the mix once the office is finished, so looking at options with a phono input.

The VR-m50's are rated as 89db sensitivity, so I don't need a massively powerful amp. They're nice and smooth, probably the best bookshelf speakers I've ever heard, so hoping to find an amp that is a good match for them. The Sabaj is supposedly rated at 80wpc, but I expect that's optimistic. In any case, in a roughly 10x10 office, it can easily drive me out of the room in terms of volume. What I'm after is accuracy and clarity above everything else. Music tastes run the gamut from Drum'n'Bass to classical to rock/pop.

Looking at used amps along the lines of a Rotel RA-01, or Onkyo A-9010. Something with a built-in DAC would be nice, but not a requirement, I can work with standard RCA inputs. Likewise, dedicated sub/pre-amp outputs would be nice, but my sub has speaker-level inputs as well, so just makes my wiring job a little easier with pre-outs. Not in a hurry, so just trying to identify good candidates to start watching for on ebay/etc. Aiming for something generally in the $200 range used, with some flexibility, I've seen the Rotel and Onkyo locally in that range which is what first made me think about upgrading.

Any other recommendations/suggestions?
 

macosandlinux

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Amplifiers are much harder to find/buy (new at least) than receivers nowadays - blame home theater for it. Good you're looking on the used market! For $200 you should consider older units as your needs for 'features' are very basic and you'll get a better sounding amp (that is 10-20yrs old) than a 5yr old entry-level amp. Forget about the DAC and just buy any recent Schiit or other entry-level DAC later on.
 

armwt

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Yep. Don't even NEED a DAC at all, would just let me run digital from the Mac.

Only features I really NEED are phono, and even that is a "want". (turntable currently attached to the HT receiver on the other side of the basement). Main thing I want is just SQ. The office is being semi-soundproofed (framing it in now), so reasonably quiet room, with reasonably good speakers, just hoping a quality amp might bring out a bit more than the Sabaj does, although I've honestly been pretty impressed with the Sabaj overall, for what it is.

And just for a bit of background, upstairs I still have my parent's 1970's Magnavox console stereo, with tube amp, 8-track, and 15 inch woofers. Needs restoration, but I grew up on the sound of old amps. That unit is what first fostered my audio habit :)
 
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macosandlinux

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Yep. Don't even NEED a DAC at all, would just let me run digital from the Mac.

Only features I really NEED are phono, and even that is a "want". (turntable currently attached to the HT receiver on the other side of the basement). Main thing I want is just SQ. The office is being semi-soundproofed (framing it in now), so reasonably quiet room, with reasonably good speakers, just hoping a quality amp might bring out a bit more than the Sabaj does, although I've honestly been pretty impressed with the Sabaj overall, for what it is.

And just for a bit of background, upstairs I still have my parent's 1970's Magnavox console stereo, with tube amp, 8-track, and 15 inch woofers. Needs restoration, but I grew up on the sound of old amps. That unit is what first fostered my audio habit :)
If you can live with a barebones (well-sounding, modern designed, small) amp that will be loud enough for near-field listening (with speakers on your desk next to monitor) look into the Schiit Rekkr ($150). The Gjallarhorn at $300 is above your price range.
 

SuperDave

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If you can live with a barebones (well-sounding, modern designed, small) amp that will be loud enough for near-field listening (with speakers on your desk next to monitor) look into the Schiit Rekkr ($150). The Gjallarhorn at $300 is above your price range.
2 watts per channel doesn't leave a lot of headroom for subwoofers. :p

I'm driving my desktop LS50's with an Aiyima T9, and they seem to like it well.
 
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uno2tres

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Fosi Audio V3 (w/ the 48v power supply). Super basic, just a volume knob and RCA jacks. Should be around $100. I’ve got one powering an old pair of advent 3s, replacing a Onkyo TX-8050. edit: TX-8011, much older but almost identical front panel

I bought it just for the sake of power and space savings, but it’s a massive quality upgrade. Much less distortion at higher volume, less noise at low volumes. The 48v power brick is absolutely necessary for 8ohm speakers though.
 
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Fosi Audio V3 (w/ the 48v power supply). Super basic, just a volume knob and RCA jacks. Should be around $100. I’ve got one powering an old pair of advent 3s, replacing a Onkyo TX-8050.

I bought it just for the sake of power and space savings, but it’s a massive quality upgrade. Much less distortion at higher volume, less noise at low volumes. The 48v power brick is absolutely necessary for 8ohm speakers though.
Yeah, Fosi has some great value stuff! Their BT30D PRO is a 2.1 channel amp that would be perfect for above scenario - just add a DAC to it.
 

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armwt

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Sub(s) are absolutely self-powered:


That being said... still doubt that 2w is going to quite cut it when I'm used to 80. Got me curious enough though that I'll actually get my multimeter out later and check what kind of power I'm delivering to the speakers at my typical listening levels.

What is the actual SQ on the Fosi amps? They look good, but wondering if that's actually an upgrade over my Sabaj A4, which seems to be in the same class. Also lacks a phono input, which is the main reason I was looking at older used gear.

That being said, it sent me on a rabbit trail into some of the newer Class D amps, some "interesting" options out there, including a SMSL SA400 for sale locally, right in the price range. Suffers from the same limitations (no phono, no DAC) but still thinking about it a bit, and browsing the offerings from SMSL and Fosi.

Seriously am in no rush. I still need to drywall, paint, etc. before I even move any furniture in (just have my desk in the space right now), but trying to learn a bit more about the impact on SQ for the different types of amps, and figuring out what fits my needs best.
 
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Paladin

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If you find something that fits your needs but doesn't have the phono amp feature integrated, you can buy a separate phono preamp device for relatively cheap. Just make sure to check if your turntable uses an MM or MC cartridge/head because that will affect the signal level output it provides and the phono preamp will need to match it (which kind of calls into suspicion all the amps and receivers that have a phono input but don't specificy MM/MC support).

Ultimately though, your particular preferences and the room itself and the combination of all the gear will make a large difference in the result, probably more than the base specs of the equipment you buy. Buy what seems good, but make sure you can easily return it if you don't end up liking it.
 
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uno2tres

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The V3 is very widely reviewed, including objective testing, which is probably more valuable than my own impression of “it sounds great“. Fosi does make an upgraded version (ZA3) with additional interfaces including a sub preout.

vs your Sabaj, they both use TI chips, so the TI spec sheet is directly comparable: TPA3255 (Fosi), TAS5342A (sabaj). Notably the TPA3255 has .006% THD+N @1W 4 ohm, while the TAS5342A has .09% at the same load, and the former has 1% THD+N @ 75w 8ohm per channel while the TAS5342 has 10%THD+N at 65w 8 ohm per channel.
 

Defenestrar

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Sub(s) are absolutely self-powered:
I'm a big fan of active speakers for any home setup. Everything is already tuned between the amp and drivers and the crossover is likewise ideal for the setup.

An alternative to a new amp could be a small mixer that you feed to your existing amp. Think of it more like a new receiver on steroids. Sweetwater has decent used listings and there are some great sub $200 models on offer. I'd buy Mackie on brand alone - Behringer is more hit and miss (although their newer offerings are innovative and less clones of others) but for what you're doing I think anything they offer would work as well.
 

armwt

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Hah! Hadn't thought of a mixer.... don't think it solves my objective of wanting to see if I can improve on the SQ, but I DO have both a small 12-channel Behringer and a 24-channel Zoom mixer in the closet...

Don't get me wrong... the Sabaj works for what I'm using it for right now, and works just fine. Just getting the itch to see if I can improve on things. With the soundproofing effort I'm putting into the office build (RSIC clips + hat channel, staggered studs, etc. for walls, I expect I'll be able to hear details a bit better than current, AND thinking of moving the turntable over from the HT area since I'm probably the only one in the family who would ever use it.
 

w00key

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the Sabaj works for what I'm using it for right now, and works just fine. Just getting the itch to see if I can improve on things.
Don't expect better electronics to improve the sound at all. THD is basically zero for normal listening volume. Subjective words like clarity, sound stage etc are never affected by the DAC or amp.*


Except one thing, room correction. Available on many AVRs or something like a MiniDSP + Umik, optionally with Dirac Live. That can totally flatten your speakers frequency response or eq it however you like (brighter, bass boost, etc), plus correcting room modes (29 + 51hz here so very very hard to fix using foam).

Umik + REW is always nice to have to measure wtf is up with a room / setup, and also to check if acoustic improvements actually work - reverb time should go down, room mode spikes should be a few dB lower, etc. If you output using a PC, the mic is all you need, you can apply your measurements + EQ to fix it with Equalizer APO. See for example
View: https://youtu.be/Ev1bSSL8tRA?si=tj_UWNYrTqzDQwa2


For non PC source, you'll need an AVR or DSP to apply the filters.


* Headphones are the exception. No room to worry about and insane sensitivity means you can hear any hiss and imperfection. But even then, tuning it using EqualizerAPO or HRTF like Dolby Headphones makes a bigger difference than electronics, once you have a decent enough amp.
 
The SQ mostly comes down to your speakers (generally true), not the amp - where the tiniest benefits will show. Any setup/angled feet/distance from wall/room acoustics will make more difference than replacing an amp. And don't waste money on RCA cables.

Maybe get a DAC first (Schiit/SMSL/Topping or a dongle DAC, like the Tanchjim Space - for around $80-$150) and don't run the amp with BT from the computer (just my $0.02). You can later on get the matching amp from same vendor for looks, if you care about that.

Some great DAC/amp combos ($150-ish) are Fiio K5 Pro ESS, Fiio K7, TOPPING DX3 PRO+ or whatever Schiit gear fits your budget. Have fun (that's the most important part)!

lacks a phono input, which is the main reason I was looking at older used gear.

Like mentioned above, best to ignore the phono part and get it separately when you need it. It will open your options for ChiFi gear immensly.
 

armwt

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Thanks all.

@wookey - you're talkin' my language there. I've done some basic EQ work balancing the room out before I built the walls, just using iPad and 1/3 octave RTA graph, but I was looking at "proper" room balancing options yesterday. I've done some fairly basic "sound engineer" work over the past 20 years or so (running sound for community theater and church groups, mostly) so enough that I know that I WANT a nice flat response but haven't put the effort in yet.

@Kiru - yeah, outside of the budget I'm looking at, but I saw the Emotive TA1 the other day and it looked like it checks most, if not all of the boxes. Link. Also saw the WiiM Amp, which seemed to check most other than the phono stage. I hadn't thought about Airplay until I saw the WiiM, may not be "Audiophile" level but would probably suffice for what I actually need.

I'd LIKE a device as close all-in-one as possible, or at least matched components, mostly due to space. The rig is likely to either be in my book case or on top of my filing cabinet once the room is finished, so the idea of amp + phono + preamp/etc. isn't ideal, but not an absolute deal breaker. Just trying to get a better idea of what's out there and what my real options are.
 

owdi

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You can get much of the benefit of room EQ using your ears and Equalizer APO.

Use an online tone generator to run a manual sweep to see if you have problem areas. It's pretty easy to tell where there is a resonance. Just hit play and move the slider around.

Online Tone Generator

There's no need to second guess yourself. If you hear something shrill, use Equalizer APO with a parametric EQ to reduce output at those frequencies.

Equalizer APO

In my case, I had a nasty resonance at 130hz that took -9db Q 2 to tame.

I do have a measurement mic and room eq software, but I found the above to work best. I sometimes move my speakers and it's quick to run a sweep and adjust as needed.
 
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armwt

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Hahahah.

Not EXACTLY, but I wouldn't object.

Long-term goal with the space was to have it "sound-proofed enough" for my kids to do some recording and/or podcasts. One of the kids IS very musical (multi-instrumental), one of the others talks about having a YouTube channel, and I've done some recording as a hobby, so...

But mostly the room is just my home office. I'm full-time WFH, and with ADHD, music helps focus. And yeah... the speakers are relatively flat, and if I'm sitting at the desk, near field. If nothing else, this thread has made me want to pull out my mic and fire up REW.... haven't touched it in a long time, and have never REALLY put the time in to learn to use it well.
 
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FrankDCat

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You were asking about NAD. I got a D 3045 integrated amplifier for the small size and phono input. It does 60W x2 channels over 8 ohms. It has low THD. I'm using it to drive a couple of floor-standing B&W speakers, and it does just fine. But at $800 online prices it is higher than you want to spend. And honestly I don't know that you need to spend that much anyhow.
 
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DrWebster

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I've used an Audioengine N22 for the past decade plus and have been quite happy with it. It's pretty no-frills, but has two analog inputs (I use one from the computer and another from my phono preamp) and a surprisingly good headphone output. It doesn't have a ton of power but drives my bookshelf speakers just fine. Very small footprint too, which was one of the major factors for me.