Pro-Ject Phono Box E BT5 Review 2026: The Wireless Phono Preamp That Actually Works
MM phono preamp · Bluetooth 5.2 aptX HD · Simultaneous wired and wireless output · MM only · No Sonos
Pro-Ject Phono Box E BT5 Review 2026
This Pro-Ject Phono Box E BT5 review covers the only device under $200 that adds a proper phono preamp and aptX HD Bluetooth to any turntable in a single box. Every other path to wireless vinyl requires either buying a new deck with Bluetooth built in, or buying a separate preamp plus a separate Bluetooth transmitter. This is one box, one power supply, one set of cables. It is the preamp used throughout all four turntable reviews on this site, paired with the Fluance RT85, the AT-LP120XUSB, the Orbit Plus, and the Sony PS-LX310BT. It earns its place in every one of those setups. But there are things you must know before buying it: it does not work with Sonos, it has no on/off switch, it has no status LED, and grounding the turntable to it is not optional. All of those are covered in full below. For how it sits in the broader preamp landscape, see the best phono preamps guide.
Quick Verdict
Pro-Ject Phono Box E BT5
Specs
Pros and Cons
Design
The Phono Box E BT5 measures 120 x 32 x 100mm and weighs 280 grams. It sits behind the turntable and disappears. The casing is compact ABS plastic in gloss black or white but feels solid due to the internal metal shielding. That shielding is not cosmetic. It blocks electromagnetic interference from the Bluetooth transmitter from reaching the phono signal path. The RCA connectors are gold-plated. Full technical specifications are published on the Pro-Ject official product page. The 3.5mm line output and 3.5mm line input sit on the rear panel alongside the RCA phono input, the grounding terminal screw, the input selector button, and the 18V power socket. Everything is clearly labelled.
Two design decisions annoy users in daily practice. There is no on/off switch. The unit stays powered whenever the adapter is plugged in. To turn it off you must either unplug the power adapter or run it through a smart outlet with remote control, a workaround multiple owners use. There is also no status LED anywhere on the unit. No indicator light for power, no indicator for Bluetooth connection. On first setup this causes genuine confusion: buyers plug it in, try to pair it, and have no way of knowing whether the unit is functioning or not. Both of these are real design limitations worth knowing before you buy.
Setup
Wired setup is five steps. Connect the turntable’s RCA cables to the phono input on the rear. Connect the ground cable from the turntable to the grounding terminal screw. Press the input selector button to confirm Phono mode is active. Connect the 3.5mm line output to your amplifier using a 3.5mm to RCA adapter. Plug in the 18V power adapter. That is the complete wired setup. The turntable selector on the best turntables guide lists which decks this pairs with and how.
The line-level input on the rear accepts any non-turntable source. This lets you use the BT5 as a standalone Bluetooth transmitter for a phone, TV, or CD player without connecting a turntable. Inputs are not simultaneous. Press the selector button to switch between phono and line in. The 3.5mm line output also works as a passive bypass even without power. If the power supply is disconnected, the line-level output still passes signal.
Sound Quality
Wired into the Edifier R1280DB with the Fluance RT85 as the source, the BT5 is clean and accurate. Kind of Blue opens with Paul Chambers’s bass sitting firmly in the lower register with texture and definition. Bill Evans’s piano on So What has proper weight at the low end of each chord without bleeding into the midrange. The presentation is neutral. The BT5 does not add warmth or brightness. It passes the signal accurately and gets out of the way. London Calling through the BT5 versus the AT-LP120XUSB built-in preamp is a meaningful comparison: the BT5 has a quieter noise floor and the guitar on the opening chord has cleaner decay before the next note. Not a dramatic difference on loud rock recordings, but consistent and audible on anything with dynamic range. The codec compatibility between the BT5 and various receiver types is documented on the Sonos community forum, where a Pro-Ject distributor confirmed the Sonos incompatibility directly to an affected user.
The BT5 has no gain or loading adjustments. It is set to MM standard at 47 kohms impedance and approximately 40dB of gain. This is correct for the 2M Blue, AT-VM95E, and the vast majority of MM cartridges in the $70 to $250 range. If you have an unusual cartridge with specific loading requirements, the Schiit Mani 2 at a similar price gives four gain settings and adjustable impedance. For the cartridges across the VinylPickup turntable lineup, the BT5 is correctly matched out of the box.
The Bluetooth
Most Bluetooth turntables use SBC, which compresses audio to around 328kbps with no quality floor guarantee. The BT5 transmits using aptX HD at 576kbps with 24-bit depth. On a receiver that supports aptX HD, the difference versus SBC is audible: cleaner high frequencies, lower noise floor in quiet passages, and better stereo separation. Rumours over aptX HD to the Edifier R1280DB has Christine McVie’s piano sitting clearly left with each note decaying cleanly before the next. Over SBC the same passage loses some definition at the top end of the piano range. Not a night-and-day difference, but consistent.
Range is confirmed at 10 metres with one wall between the BT5 and the speaker. Through two walls signal held but dropped occasional packets. The 10m spec is accurate for line-of-sight. The simultaneous output is the most useful feature in daily use: the Edifier R1280DB receives wired signal for the main listening room while Bluetooth headphones receive the same vinyl in another room. No switching required. Both outputs are always active. One practical note: because there is no on/off switch, the BT5 is always broadcasting when powered. If you have multiple Bluetooth devices nearby it will attempt to connect to whichever it was last paired with. Some users connect it through a smart outlet with remote control to manage power without unplugging.
The Hum Issue
The Phono Box E BT5 Amazon listing has a low overall rating largely because a meaningful number of buyers connect it without grounding the turntable and encounter a loud 60Hz hum. The Pro-Ject manual states this explicitly: connect the earthing wire of the tonearm signal lead to the screw terminal if you encounter hum problems. This is not a product defect. All external phono preamps require a ground connection. The hum is caused by the absence of one.
Sonos Warning
Who Should Buy
For context on how the BT5 compares against every other phono preamp at every price, see the best phono preamps guide. If you are also deciding which turntable to pair this with, the best turntables guide covers the full lineup.
vs Alternatives
The Schiit Mani 2 is the right choice if you want wired-only use with the ability to tune gain and loading for different cartridges. At roughly the same price it gives four gain settings, adjustable impedance via DIP switches on the bottom, and a proper on/off switch. If you want Bluetooth, you buy the BT5. There is no wired preamp at this price that also adds aptX HD Bluetooth. That is the BT5’s territory and nothing competes with it directly.
Verdict: 8.5/10
The Phono Box E BT5 earns its score because nothing else at this price does both jobs. The phono stage is clean, accurate, and correctly matched for MM cartridges in the $70 to $250 range. The Bluetooth is genuinely high quality. aptX HD is a material step above the SBC found on most wireless turntables. The simultaneous output is a daily-use feature that is genuinely useful. The limitations are real: MM only, no Sonos, no gain adjustment, no on/off switch, no status LED, and grounding is required. Know all of those before buying and this device delivers exactly what it promises. Skip the grounding step and you will leave a one-star review about hum. The hum is your ground cable.
Pro-Ject Phono Box E BT5
Frequently Asked Questions
No. The BT5 transmits using aptX, aptX HD, and aptX Adaptive only. Sonos speakers and soundbars receive Bluetooth via SBC and AAC only. The codecs do not overlap. Both devices will complete a pairing handshake but no audio will pass. There is no fix or workaround. If your wireless speakers are Sonos, this device will not stream to them wirelessly. The wired 3.5mm line output still works for a wired connection to any amplifier.
Almost always a missing ground connection. Connect the turntable’s ground cable to the grounding terminal screw on the rear of the BT5. If the cable was previously connected to an amplifier’s phono ground terminal, move it from the amplifier to the BT5. Connecting it to both simultaneously creates a ground loop and makes hum worse. Once grounded correctly the hum disappears immediately. This is the cause of most negative reviews of this product.
There is no pairing button and no LED. Put the new Bluetooth receiver into pairing mode first, then unplug the BT5 from power and plug it back in. It connects automatically to the device in pairing mode. To switch back to a previous device, repeat the same process with that device in pairing mode. Turn down the volume on the receiver before reconnecting, as some speakers spike briefly on reconnect.
Yes. The 3.5mm line output and Bluetooth output work simultaneously at all times. You can feed a wired amplifier and Bluetooth headphones from the same vinyl source at the same time with no switching required.
No. The BT5 is designed for moving magnet cartridges only. MC cartridges output 0.2 to 0.5mV versus 5 to 6mV for MM. The BT5 fixed gain is set for MM. Connecting an MC cartridge will produce very low volume and poor wireless transmission quality. For MM and MC compatibility with adjustable gain, consider the Schiit Mani 2.
Partially. The 3.5mm line output acts as a passive bypass when the line-level input is selected, even without power. This means you can still get a wired signal through the unit if the power adapter fails or is disconnected. The phono preamp stage and Bluetooth transmitter require power to operate.
James Calloway has been collecting vinyl for 22 years. He spent six years working at an independent record store in Chicago, setting up and demonstrating turntables for customers at every budget. He writes all turntable and gear reviews for VinylPickup.com. No manufacturer sends products to this site. No brand has any input into what gets written about their products.
