• WANTED: Happy members who like to discuss audio and other topics related to our interest. Desire to learn and share knowledge of science required as is 20 years of participation in forums (not all true). Come here to have fun, be ready to be teased and not take online life too seriously. We now measure and review equipment for free! Click here for details.

$500 amplifiers to test and review?

mhardy6647

Major Contributor
Joined
Dec 12, 2019
Messages
1,335
Likes
1,918
From the specs, I don't think it will be any different than the A500 that I have. So I don't think it pays to ship it back and forth.
But, but, but... it's got Accelerated Transient Response! :cool:

In seriousness (well -- as close as I get to seriousness), I, too, am intrigued by this amplifier. Mostly, I am intrigued as to why it exists in Behringer's product lineup. From their perspective, there must be things that differentiate it from their several other similarly priced and similarly powered products. In 2020, the proliferation of too many SKUs is anathema to most brands, as far as I know. The existence of the KM750 as a product suggests (to me!) that it's worth a shake-down (i.e., quantitative assessment)! :)

1583670664849.png

1583670689959.png

1583670960715.png
 

Panelhead

Active Member
Forum Donor
Joined
Apr 3, 2018
Messages
279
Likes
101
Looks very industrial. Also 1980’s. Five bipolar transistors per phase should allow high current, Also good to see balanced and single ended inputs.
What I do not like,
Power transformer and supply board could be swapped, transformer close to AC inlet.
Circuitry is spread out too much. Tighter layout is better.
VBE multipliers could be positioned in the middle of the heatsinks, not at the ends.
 

sergeauckland

Major Contributor
Forum Donor
Joined
Mar 16, 2016
Messages
1,632
Likes
3,490
Location
Suffolk UK
Looks very industrial. Also 1980’s. Five bipolar transistors per phase should allow high current, Also good to see balanced and single ended inputs.
What I do not like,
Power transformer and supply board could be swapped, transformer close to AC inlet.
Circuitry is spread out too much. Tighter layout is better.
VBE multipliers could be positioned in the middle of the heatsinks, not at the ends.
There's a good reason for putting the transformer close to the front panel, and that's because when the amp is mounted in a 19" rack, one doesn't want the weight hanging too far out as this will strain the front panel. This is especially important in a PA rack which will get shipped from gig to gig. It also makes it much more difficult to screw the amp in the rack with weight hanging out the back, it can become a two man job with some amps. One great benefit of a SMPS is losing the weight of the transformer.

S
 

mhardy6647

Major Contributor
Joined
Dec 12, 2019
Messages
1,335
Likes
1,918
Just acquired an Apart CHAMP-2 pro amplifier (used, for 125€) that costs - with free shipping - € 483 @ Thomann.de:



...unfortunally I can't send to USA for measurements...
That looks like the guts of most of the $5 to 10k (USD) amplifiers I see on more tradtionally "audiophile" sites. And I do mean that as a compliment to this amp. :)
 

sm5

Member
Joined
Jun 15, 2019
Messages
58
Likes
119
Location
USA
A newer high end Icepower amp such as the 1200AS2 (maybe a bit above $500 though) would be nice as there's a lot of reviews on Hypex/Purifi models on here (I own two) and they all measure well but a different companies class D top of the line amp would be nice (There's a 125asx2 already so we have a low end model)

Anaview would have been nice as some people said they were as good if not better than hypex for class D - but I don't think they make amps anymore so it's probably pointless. Otherwise Outlaw/Emotiva Differential amps would be interesting.
 

trl

Major Contributor
King of Mods
Joined
Feb 28, 2018
Messages
1,099
Likes
1,044
Location
Iasi, RO
Just acquired an Apart CHAMP-2 pro amplifier (used, for 125€) that costs - with free shipping - € 483 @ Thomann.de:



...unfortunally I can't send to USA for measurements...
That's an interesting review. I'm not a German speaker, so Google translate helped me a lot here:

ORIGINAL POST:
"OK, aber nicht Spitze
JuF, 09.04.2018
Ich habe diese Endstufe mit einer PAS 2002PCA verglichen und beide vermessen (APx515). Die APART can be nicht annähernd mithalten. Rauschen und THD ca. 10db schlechter und recht ausgeprägter Restbrumm. Die Limitierung funktioniert aber recht gut - PAS clip clip recht hart.

Die Kanten der Kühlkörper sind sehr scharf und man hat keine Speakon Anschlüsse - aber prinzipiell ist die Verarbeitung gut.

For "normal" Anwendungen (HiFi Lautsprecher und größerer Abstand, Installation etc.) can be used for Amp ruhig hernehmen, für anspruchsvolle Aufgaben (Abhöre mit höherem Wirkungsgrad, knapper Sitzabstand, ruhiger Raum) gibts besseres.
Geht zurück".


GOOGLE TRANSLATED POST:
"OK, but not great
JuF, April 9, 2018
I compared this power amplifier with a PAS 2002PCA and measured both (APx515). The APART cannot be anywhere near. Noise and THD about 10db poor and quite pronounced residual hum. The limitation works quite well - PAS clip clip quite hard.

The edges of the heat sinks are very sharp and there are no Speakon connections - but in principle the workmanship is good.

For "normal" applications (hi-fi speakers and greater distance, installation, etc.) can be used for Amp quietly, for demanding tasks (monitoring with higher efficiency, close seat spacing, quiet room) there is better.
Go back".


However, a more appropriate compare would probably be between the same PAS amplifier and CHAMP-4, due to the similar power outputs , prices and the internal shielding from the transformer on the CHMAP-4 (the so called "residual hum" will dimmish a lot here).

Please allow me to challenge you to send this over to @amirm for testing, just check with him about this. If there's something that can get wrong this would be Customs, but not shipping itself.
 
OP
amirm

amirm

Founder/Admin
Staff Member
CFO (Chief Fun Officer)
Joined
Feb 13, 2016
Messages
28,203
Likes
72,817
Location
Seattle Area
Thread Starter #616
Power transformer and supply board could be swapped, transformer close to AC inlet.
It is rack mounted so from weight distribution point of view, it makes sense to put the transformer in the front.
 

rebbiputzmaker

Addicted to Fun and Learning
Joined
Jan 28, 2018
Messages
915
Likes
260
Actually I tried giving my US shipito address to amazon.de, and it would happily proceed with the order and even removes VAT..

Order Summary
Items: €318.49
Postage & Packing: €35.67
Order Total: €354.16

So 390$ total for STA-1000D (dunno if there's some import taxes)

@amirm or someone want to purchase for measurement? I'll be happy to donate 20€ :D
I see you have gotten information on the IMG amps. Do you know what the input opamp is?

Thanks
 
Top Bottom