A home theater projector hangs from the ceiling or sits on a shelf behind the couch. A portable projector sits wherever you put it, and where people put it is on a nightstand, on a camp table in a tent, or on a shelf in a child's bedroom. In each of those places the fan is an arm's length from someone's head, and in two of them that head is trying to sleep.
That changes which number matters. Our main projector guide covers every type and our short throw guide covers the laser TV under the screen. This guide covers the small ones: battery models from Dangbei, BenQ, Anker Nebula, XGIMI and Yaber, plus the mains powered cubes from LG, XGIMI, Dangbei and Epson that get sold as portable because they weigh a kilogram or two. We read specification pages, PDFs and support pages from eight makers for nineteen models. Sixteen of them carry a noise figure, and not one of them carries a figure for running on battery.
Our picks are listed above, with full specifications for each.
The portable makers print their figures three different ways, and the groups do not line up with each other.
- A-weighted, by mode. BenQ lists "28dBA/26dBA" for the GV50 and the recalled GV31, and "29dBA/27dBA" for the GS50, typical first and eco second. LG lists 25, 27 and 29 dB(A), each with a down arrow meaning or lower, for its three energy saving steps on the CineBeam Q. These are the only A-weighted figures in the guide.
- Plain dB with a distance. Dangbei prints "Standard Mode" under 24dB at 25 degrees C and 1 metre for the Freedo, and under 27dB on the same terms for the N2 mini. XGIMI prints
≤28dB@1m for the Elfin Flip, under 30dB for the Halo+ and MoGo 2 Pro, and ≤32dB@1m for the MoGo 3 Pro, each with a footnote giving 1 metre and 25 degrees C or 77 degrees F.
- Plain dB, bare. Anker lists "Noise Level" under 28dB for the Capsule 3, Mars 3 Air and Mars 3, with no mode and no distance. Epson lists ranges, "18 - 22 dB" for the EF22 and "19 - 23 dB" for the EF21, with no mode named. Dangbei's Atom gives under 24dB at 25 degrees C but drops the distance.
We do not rank an A-weighted figure against a plain one, and we do not rank a 1 metre figure against a bare one. The LG's 25 dB(A) and the Dangbei's 24dB look a point apart on the page; they are not the same measurement and may not be close. For what the A adds, see our dBA explainer, and for why a bare figure cannot be placed against your pillow, see why you cannot compare dB ratings across brands.
The distance matters more here than in any other projector guide. A figure taken at 1 metre is, give or take, the figure at a nightstand. Dangbei and XGIMI are the only makers who say so, which is why the Freedo and the Elfin Flip hold two of the awards above.
What happens on battery
Every battery model in this guide publishes one noise figure, and every one of them publishes it for mains power with no caveat. The makers do say what battery running does to the picture, and that is the closest we have to a battery noise story.
BenQ is the plainest. Its GV50 FAQ asks "If I use battery mode, will it impact the image brightness of GV50?" and answers "Yes, using battery mode may impact image brightness. The GV50 features three brightness modes: Auto, Eco, and Custom." For the GV31, BenQ says its 180 minutes of playback "is measured under Low Power Consumption mode".
Anker rates every Nebula battery the same way: "Battery Life (Eco Mode) 2.5 Hrs" for the Capsule 3 and Mars 3 Air, and 5 hours for the Mars 3. Its Mars 3 FAQ then explains what Eco Mode is: "the display brightness is lowered to 300 lumens to extend the playtime of the projector". That is 300 lumens from a 1,000 ANSI lumen projector. Dangbei rates the Freedo at "2.5H in Eco Mode" and gives no runtime for Standard Mode, the mode its noise figure describes.
XGIMI goes one step further on the MoGo 3 Pro, which has no battery but runs from a power bank. Footnote 12 says that "When the power bank's output is less than 150W, the main unit will automatically switch to ECO Mode." You do not choose it; the projector does.
So the pattern is consistent: on battery, or on a weak power bank, these projectors run a dimmer mode. A dimmer light source usually needs less cooling, so the fan probably runs slower, and the Eco figures BenQ and LG publish for mains power hint at how much that is worth: 2 dBA on the BenQ models, 4 dB(A) across LG's three steps. But that is our reasoning. No maker publishes a battery mode figure, and we will not invent one.
Auto brightness and the loud case
Several of these projectors change their own brightness, and brightness is what drives the fan. Anker's Mars 3 has an "AI mode" that "automatically adjusts the display brightness based on the ambient brightness in the room". BenQ's GV50 has an "Auto" brightness mode. Samsung's Freestyle page lists "Auto Power Saving".
None of those makers say what the auto mode does to the fan. XGIMI comes closest, in a footnote on the MoGo 3 Pro: "In Performance Mode, the highest brightness is achieved, which may result in some color differences compared to the default viewing mode. Additionally, the fan speed may increase, potentially causing noise. This is normal." Samsung says something similar about its Freestyle in a support page: "A humming sound may also occur when the projector's brightness level is high."
Put those together and the loud case for a portable projector is a bright room with an auto mode on. For a nightstand or a tent at night that is unlikely. For a kid's room on a sunny afternoon it is exactly what will happen, and the published figure, measured in a laboratory, will not describe it.
How quiet the room is
A bedroom at night is the quietest room in the house, and it is where a portable projector most often ends up. Our quiet bedroom page explains why a figure near the bed counts for more than the same figure across a living room: there is no soundtrack, no fridge and no traffic to cover it once the film ends and the projector sits on its home screen. A child's bedroom is stricter still, and our quiet nursery page covers the other machines that share it.
Roughly every 10 dB is a doubling of how loud something sounds. The published figures here run from 18 dB at the bottom of Epson's range to 32 dB at the top of XGIMI's, and 4 dB between two models at a nightstand is a difference you will hear in a silent room. Our decibel chart sets those numbers against a whisper and a fridge hum.
A tent is the odd one out. The ground, the canvas and the night outside all make their own noise, and a projector's own speakers cover its fan while something is playing. The Mars 3 Air's two 8W speakers and the Mars 3's 40W will do that; the Capsule 3's single 8W and the LG's 3W mono may not. The moment the fan matters in a tent is when the film ends and someone is already asleep.
What else you will hear
The focus motor. Samsung's Hong Kong support page says "Sound is made when the Auto Focus function is operating. This is not a defect of the product." Every portable projector here has auto focus, and most of them refocus when they are moved or nudged, which on a nightstand is often.
The casing. Samsung's Canadian page lists a "Popping sound" from a casing that "may expand and contract while the device is being used" and a "Humming sound" from the internal circuits. Neither carries a number.
A DLP whine. BenQ says on its own site that 4K DLP pixel shifting can cause "a slight or unnoticeable high-frequency noise". The LG CineBeam Q is a 4K DLP cube. The 1080p DLP models here, which is nearly all of them, are not covered by that answer, and Epson's EF22 is 3LCD.
Heat. Dangbei rates the Freedo for "0°C~35°C" and the N2 mini and Atom for 5 to 35, BenQ and LG rate their models to 40 degrees C, and Epson rates the EF22 to 35. A projector tucked behind a bedside lamp or left in a hot tent will run warm, and our main guide shows how far a warm room can push a published figure.
The recall. BenQ has recalled the GV31 because its battery "may overheat and pose a fire risk". It stays in our list only so that nobody buys one second hand on the strength of its 26dBA figure.
The trade-offs
Brightness is the first cost. Our picks run from 200 ANSI lumens to 500, against 2,000 to 4,000 for the full size models in our main guide, and the makers say so: Dangbei, XGIMI and Anker all footnote that their brightness was measured in the highest power mode, which for the battery models is the mains mode. Brightness units do not line up either. BenQ, LG and Anker quote ANSI lumens, Dangbei and XGIMI quote ISO lumens, and Epson quotes IDMS and ISO. Treat them as separate lists, as we do with dB and dB(A).
Runtime is the second. The battery ratings here are 2.5 hours in Eco Mode for the Freedo, Capsule 3 and Mars 3 Air, 180 minutes in Low Power Consumption mode for the recalled GV31, and nothing at all in hours for the GV50 and GS50. A film and a half, on the dim setting.
Availability is the third. Epson marks both EpiqVision Mini models Discontinued. XGIMI marked every Halo+ and MoGo 2 Pro variant not available on its own store when we checked. BenQ loads its prices by script, so we could read none of them, and LG's Canadian page gave us figures but no price.
Where the numbers stop
Samsung publishes no dB figure for The Freestyle 2nd Gen anywhere we could read, only the descriptions above. Yaber's T2 and T2 Plus page has a battery row and a handle row but no noise row, and its K3 page lists a "Quiet Mode" with no number attached. Anker's page for the Capsule 3 Laser has no noise row either, although its three LED Nebulas all carry one. LG's US site blocks us, so the CineBeam Q figures come from LG's Canadian site for the same model number.
We did not measure any of these projectors. Every figure here is the maker's own, quoted as published with the unit, mode, distance and temperature the maker attached, and we say where the maker attached none.
