What is the subwoofer frequency crossed at?

According to the Fosi site, the 'sub freq' knob does exactly what you would expect, acts as a variable crossover point control. ""...adjustable 40-300Hz cutoff frequency for subwoofer... It doesn't say what the slope of the cutoff is.

Are they screw fasteners for the speaker wires?

The unit has a set of combination binding pot/RCA connections. So it will accept bare wires or RCA connectors for your speakers.

has any one used this with a non powered sub, and did it sound OK ?

William, I have this Fosi amp for a small patio sound system. I do have a sub speaker but it is powered and not passive. I am 100% satisfied with the sound of my system. The Bluetooth works great as well as the aux input. This however does not answer your question but I may give you something to consider. According to Fosi specs, the rated output is 50 watts + 50 watts + 100 watts. I deduce that to mean 50 watts for each left & right speaker and 100 watts for sub speaker. That should be a sufficient 2 to 1 ratio for output division. Fosi also states that the output can be increased with an option 8 amp power supply, but they don’t state exactly how much the output increases. Whether or not a passive sub speaker would “sound ok” has many other variables, ie: size of speaker, sensitivity of speaker, speaker material, type of enclosure that houses speaker, if the enclosure is ported and if the port is tuned properly, if speaker is front firing or down firing, acoustical environment, etc, etc. It is possible a passive mode that the sub speaker may not “sound” satisfactory but may not be the fault of the Fosi amp. I hope this was helpful.

I see in some reviews that there should be a bluetooth/rca switch on the back , but no switch exists on mine. how do i switch to bt and pair it?

For the BT30D theres a power switch on the front. When you turn it on it activates the Bluetooth, but uses the RCA jacks until you actually pair a device via Bluetooth. Just unpair the Bluetooth if you want to use a turntable or DAC.

Desertcart Logo

Deliver to Slovakia

For best experience Get the App

DOWNLOAD THE APP

WE SOURCE ITEMS FROM

UAE
UK
India
USA
Japan
KOREA

Customer Services

About Us

Customer Support

Description

🎧 Elevate your sound game—wireless power meets pro-grade clarity!

TRUSTED BRAND QUALITY - From Fosi Audio, a name synonymous with reliable, high-quality audio gear that elevates your sound experience to the next level.
COMPACT POWERHOUSE DESIGN - Sleek and lightweight (680g), this amplifier fits perfectly into any modern workspace or home setup without sacrificing performance.
PLUG AND PLAY CONVENIENCE - No batteries needed—just connect and amplify your audio instantly, making it perfect for busy professionals on the go.
CRYSTAL CLEAR BLUETOOTH 5 0 - Experience wireless audio with ultra-stable, high-fidelity streaming that keeps your playlist flawless and your space clutter-free.
VERSATILE RCA SUBWOOFER SUPPORT - Plug in your favorite wired speakers or subwoofers effortlessly for a rich, immersive soundstage that commands attention.

The Fosi Audio BT30D PRO Bluetooth Power Amplifier combines cutting-edge Bluetooth 5.0 technology with versatile RCA and subwoofer connectivity in a compact, lightweight design. Perfect for professionals seeking high-quality, clutter-free audio amplification without the hassle of batteries.

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

ChatGPT - opens in a new tab Perplexity - opens in a new tab Claude - opens in a new tab Grok - opens in a new tab Google AI - opens in a new tab

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Fatima A.

Best international shipping I've ever tried. Worth every penny!

3 days ago

Abdullah B.

Great price for an authentic product. Fast international shipping too!

3 weeks ago

View all Trustpilot reviews

Compatible Devices	Speaker
Batteries Included	No
Batteries Required	No
Brand	Fosi Audio
Item Model Number	BT30D PRO
Special Features	Built-In Bluetooth, RCA, Subwoofer
Connectivity Technology	Bluetooth
Product Dimensions	15.24 x 12.7 x 2.54 cm; 680.39 g
Item Weight	1.5 Pounds

Bluetooth Amplifier Power Amplifier 5.0 Stereo Amplifier Audio Amplifier

Details

Description

Specifications

Have a Question? See What Others Asked

Common Questions