Here is a very clear list of the technical differences:
https://www.bhphotovideo.com/c/compare/PreSonus_E3.5_BT_vs_PreSonus_E5_XT_vs_PreSonus_E4.5_BT/BHitems/1506256-REG_1482352-REG_1506255-REG
With the E5, the woofer in particular is larger. I think that makes the bass clearer and better. Apart from that, the sound is probably similar.
According to our information, this is the same product, but this one is the 2nd generation. PreSonus Eris 3.5 actieve studiomonitor (tweedelig) (Aktiv)
That’s correct. Studio one is included. You get access, when you register product. There is also some number, bit I don’t remember if this is registration key. Anyway all you need is in the package. There is no separate delivery by Galaxus/Digitec.
PreSonus offers the Eris Sub8, which has the necessary inputs and outputs. Subwoofers from other manufacturers that have the necessary inputs and outputs for passing the signals should also work.
These speakers are perfectly adequate for listening to music. This speaker model even has a bass and treble control on the back, at a very good price of 104.-, which allows you to adjust the music exactly to your taste.
I have had very good experiences so far.
Sincerely
Do you have bass? Yes, you do. There is a rotary control on the back to additionally boost or attenuate treble and bass. But of course the sound pressure on the bass is generally somewhat limited. It's only a 2-way system. And there is also no option for a subwoofer. I need these active speakers for good and preferably linear and undistorted monitoring and not so much to listen to music and let the bass "massage" me. As monitoring speakers they perform very well. Especially if you don't consider the low price.
The speaker has two different inputs: balanced/symmetrical (6.3 mm jack) and unbalanced/asymmetrical (cinch).
Via the PC / iMac you always get an unbalanced signal via the 3.5mm jack. With an appropriate cable (jack - cinch), the speakers can be connected directly.
Balanced (symmetrical) audio signals are common in professional mixing consoles. The transmission of such balanced audio signals is not susceptible to interference, especially over longer distances. A connection from the PC to the "balanced" connection at the loudspeaker would only be possible via a DI box (which converts the asymmetrical signal into a symmetrical signal). For home use and the connection of a PC / iMac, this diversions is unnecessary, so it is better to connect directly via the unbalanced connection (cinch).
I have been using these (and also the E4.5) for two years without any problems. Connected via the balanced 6.3mm jacks. Important: In most cases the hum is not caused by the loudspeaker but by a so-called hum loop (ground loop). This means that the 50Hz of the power line become audible as hum through a ring connection via the ground of the various devices (amplifier, loudspeaker, etc.). In such cases, the ground must be interrupted at a certain point (e.g. with a ground isolating filter or adjustable on the unit itself). Information on this can easily be found on the Internet. A second important source of hum can be so-called interference. This is caused, for example, by unbalanced audio cables (e.g. chinch cables) running parallel to a power cable or in the immediate vicinity of transformers. Whenever possible, balanced audio connections (e.g. XLR cables) should be used, as the audio signal cannot be disturbed so easily.
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