All of them are total absolute crap.

Check topic about small normal ones

http://www.personal-view.com/talks/discussion/4437/reference-mini-active-speakers-topic/p1

This is cheapest useful things

• (NXT tech) http://www.ebay.com/itm/Sound-Science-Corp-Qsb-30-Watt-USB-Stereo-Speaker-Set-TUS510-NEW-/252919739042?hash=item3ae330f2a2:g:5IIAAOSw42dZC1UX
• Another one http://www.dx.com/p/senicc-sn419-portable-3-5mm-speaker-pair-269473#.WUrNV00fCUk
• Logitech mm50 - http://www.ebay.com/sch/i.html?_trksid=p5197.m570.l1313&_nkw=logitech+mm50&_sacat=0

@apefos

Well, at least look at better local options.

https://www.amazon.com/Creative-GigaWorks-Multimedia-BasXPort-Technology/dp/B001RNOHDU/ref=sr_1_2?ie=UTF8&qid=1498078992&sr=8-2&keywords=creative+speakers

This must be available local and many other larger speakers.

Look for ones with silk dome.

I have a strong feeling that the twitter in the SP091 speakers can be just decorative, no sound. But I did not find information about it.

so, the final options are:

option 1: Combo: SP-303BK + SP091 (for use alone, interleaved, to compare the sound, or for use together with a p2 splitter cable)

https://www.kabum.com.br/produto/79031/caixa-de-som-c3tech-portatil-speaker-2-0-preta-sp-303bk

https://www.kabum.com.br/produto/12737/caixa-de-som-2-0-multilaser-8w-black-piano-sp091

option 2: Microlab B-70 (almost twice the price, but the design looks like studio monitors). It is the only one better option that I can afford, all others are expensive for me.

http://www.microlab.com/?r=Stereosystemen&st=full&id=640

https://www.kabum.com.br/produto/43727/microlab-caixa-de-som-speaker-2-0-20w-rms-b-70-

http://produto.mercadolivre.com.br/MLB-870139431-par-de-monitores-ativos-microlab-b70-20-watts-rms-nova-_JM

maybe some day...

I am working, but in the first moments of work there is no money incoming.

Maybe. If it is possible to share time.

Review about the Multilaser SP091 Speakers (teste):

Without equalization, in flat, it has more trebles, some more mid, and less bass. But good thing is trebles are not harsh so it is possible to solve. After equalization the frequencies get more balanced and pleasing to the ears. Bass, mid and treble are ok after equalization.

After equalization, the sound is detailed and it is possible to identify all instruments. Voice is good and clear without sibilance. There is no confusion or cluttering in the frequencies.

There is a bass opening in the rear which helps to improve the bass performance. The size of the housing is big compared to the speakers itself which is good to improve the bass performance also.

As I was thinking, the tweeters are just decorative, no wires on them, but it seems to help some small amount of mid and low-mid frequencies to come out working as a semi-open membrane. I perceived this when I put the ears close to it. To my ears there is no need of separated tweeters.

The speakers itself are 1,75 inch and have good construction, similar to professional speakers, when looking inside. They have a floating surrounding curved membrane which helps the speakers to vibrate.

Listen music is pleasant, so it seems a good buy for using with daw software and video editing when you get tired of using headphones, not for professional mixing of course, but useful for enjoy music and interleave with headphones when working.

It is made of plastic so it is easy to clean. The small toward-up angle helps the sound go in the ear direction when the speakers are on the table. The construction is plastic, but solid, well made, there is no vibrations when sound is loud.

The speaker amplifier do not introduce noise or hiss. The cables are not so thin, so I hope it can resist over time.

There is a power button, a volume control, a power on led, and earphones out (amplified and also adjusted by volume).

The vertical construction and small base can make them fall if you accidentally touch them, but no problem at all because if they fall on the table they will not break. Just avoid fall in the ground. There are four rubber feet in each side, good to avoid direct plastic contact with the table and avoid vibrations.

The sound volume you can get from it is loud enough to satisfy music listening, and If you are in a place that you cannot use very loud speakers, this Multilaser SP091 is a good choice. You can get 100db from left and 100db from right without distortion (measured with my decibel meter). For a 1,75 inch speaker in each side the sound is very good. The manufacturer specification is 8 watts RMS for the pair.

Interesting thing: if you sit in front of it, with the speakers besides the computer monitor, after the equalization, rotating the speakers around it's own axis can help a lot calibrating bass and trebles. Just find a position that puts the speakers not direct pointed to your ears, but in around 45 degree outside. The angle also depends on the music you are listening, some music sounds good with the speakers diretc towards you, other music are better with some angle. If the trebles get a little bit piercing in some musics even after equalization, this angle trick can solve it.

You may ask: if trebles are a little bit piercing in some musics why not change the equalization instead of changinf the speaker angle? Because if you exceed lowering trebles equalization it can sounds muted like there is a cloth over the speaker, so the angle trick works better.

I use the volume in computer in 44 (between 0 and 100), and volume in the speakers in maximum. I perceived that volume in 44 in computer is high and do not introduce distortions. The computer volume can be raised if the original sound is less loud. For audio reference or monitor it is better to keep the computer volume in 44 and speakers at maximum and professionally adjust the sound level in the video editing or daw software using the visual sound levels and compare with the headphones.

For the price (less than 16 usd) it is excellent (if you know how to equalize).

They are powered by usb, there is a usb cable. The usb is just for power, there is the green p2 stereo cable for connect to the computer sound output. All the cables are fixed, not possible to remove.

Size is around 8 x 3,2 x 3 inch each speaker. The cardboard packing box protects the speakers and it's size is 20,5cm x 19,5cm x 8cm, possible to carry in a backpack. The total weight with packing is 625 grams (written in the box).

Using the 20HZ to 20KHZ audio test from audiocheck website proves that it can deliver all the frequencies with very reasonable calibration (after equalization). The manufacturer specifications are 60hz to 20khz frequence response, but I can hear more lower bass frequencies from 20hz when using the audiocheck audio test, less louder compared to the 60hz but present.

Equalizer settings (sound card software). Small subtle changes. Depending on the music, a little more bass is welcome, or a little less mid is welcome, or more open or closed trebles. But there is a best setting, see:

seta: 60=3, 170=3, 310=2, 600=1, 1k=-2, 3k=-4, 6k=-6, 12k=-5, 14k=-3, 16k=12

setb: 60=3, 170=3, 310=2, 600=1, 1k=-2, 3k=-4, 6k=-6, 12k=-5, 14k=-3, 16k=0

setc: 60=4, 170=4, 310=3, 600=2, 1k=-2, 3k=-4, 6k=-6, 12k=-5, 14k=-3, 16k=12

setd: 60=4, 170=4, 310=3, 600=2, 1k=-2, 3k=-4, 6k=-6, 12k=-5, 14k=-3, 16k=0

sete: 60=3, 170=3, 310=2, 600=1, 1k=-3, 3k=-5, 6k=-6, 12k=-5, 14k=-3, 16k=12

setf: 60=3, 170=3, 310=2, 600=1, 1k=-3, 3k=-5, 6k=-6, 12k=-5, 14k=-3, 16k=0

setg: 60=4, 170=4, 310=3, 600=2, 1k=-3, 3k=-5, 6k=-6, 12k=-5, 14k=-3, 16k=12

seth: 60=4, 170=4, 310=3, 600=2, 1k=-3, 3k=-5, 6k=-6, 12k=-5, 14k=-3, 16k=0

seti: 60=2, 170=2, 310=1, 600=0, 1k=-2, 3k=-4, 6k=-6, 12k=-5, 14k=-3, 16k=12 (best settings in general, for music listening, for audio mixing reference, or comparison with headphones)

setj: 60=2, 170=2, 310=1, 600=0, 1k=-2, 3k=-4, 6k=-6, 12k=-5, 14k=-3, 16k=0

setk: 60=2, 170=2, 310=1, 600=0, 1k=-3, 3k=-5, 6k=-6, 12k=-5, 14k=-3, 16k=12

setl: 60=2, 170=2, 310=1, 600=0, 1k=-3, 3k=-5, 6k=-6, 12k=-5, 14k=-3, 16k=0

setm: 60=0, 170=2, 310=3, 600=0, 1k=-2, 3k=-4, 6k=-6, 12k=-5, 14k=-3, 16k=12 (excellent choice to increase the perception of the electric bass instrument) (a little more mid-bass helps the trebles to be a little less piercing also)

setn: 60=0, 170=2, 310=3, 600=0, 1k=-2, 3k=-4, 6k=-6, 12k=-5, 14k=-3, 16k=0

seto: 60=0, 170=2, 310=3, 600=0, 1k=-2, 3k=-4, 6k=-6, 12k=-3, 14k=-2, 16k=12 (same as setm but with a little more open trebles, this is good if the music sounds muted trebles with the setm)

setp: 60=0, 170=2, 310=3, 600=0, 1k=-2, 3k=-4, 6k=-6, 12k=-3, 14k=-2, 16k=0

If you ask me about numbers I would rate it as 7 out of 10. Why? Because it sounds like small speakers. It is impossible to make a small speaker sounds as large studio monitor speakers. But not considering comparison with larger speakers I would rate 9 out of 10 because the mid and trebles are more pronounced than bass without equalization and sometimes it also has this behavior when pointed direct to the ears even with equalization and needs the angle trick.

https://www.kabum.com.br/produto/12737/caixa-de-som-2-0-multilaser-8w-black-piano-sp091

http://lista.mercadolivre.com.br/sp091#D[A:sp091]

sorry for bad quality photos!

Now the Multilaser SP091 Review (teste) is complete, see in post above.

The SP-303BK is crap. But the SP091 is very good, see review above.

I agree with you about getting good equipment, because bad equipment is loosing money.

I hope the SHP300 headphones is good enough like the SP091 speakers, I will say when it arrives.

@apefos

Headphones that I suggested are tested by tens of thousands of people.