4D Furnishers Single Passive to Active Home Theater SubWoofer Amplifier | 300 Watts RMS | HSWA-300 (Update 20.06.2024)

This is a pure Class AB amplifier, and that itself is refreshing in today’s market dominated by Class D designs. It features a genuine, separate low-pass filter, which can be bypassed if needed, effectively allowing the unit to be used as a monoblock amplifier—a thoughtful and practical design choice. At this price point, a toroidal transformer is understandably not feasible. However, the use of a traditional EI transformer is still a better and more reliable choice compared to many Class D amplifiers that rely on external SMPS units, most of which are China-made and often cost significantly more. From a durability and serviceability perspective, this is a sensible engineering decision. In a market like India, where price sensitivity is a major factor, designing and delivering a well-built Class AB amplifier at this cost is quite remarkable. Overall, this amplifier offers excellent value for money, solid performance, and honest engineering without unnecessary gimmicks. Highly recommended for those who appreciate sound quality, simplicity, and reliability over marketing hype, and at a cost which can be affordable by average people like me. ई pure Class AB amplifier हवे, आज के Class D से भरे बाजार में एकदम fresh feel देवे वाला। इसमें असली अलग Low-Pass Filter बा, जवन bypass करके इसे monoblock amp भी बना सकतानी—बिलकुल practical design। एह दाम में toroidal transformer ना मिल पाना समझ में आवे ला, लेकिन EI transformer Class D + बाहरी SMPS (जो ज़्यादातर China से आवे ला) से कहीं ज़्यादा भरोसेमंद बा। भारत में जहाँ दाम बहुत matter करेला, ओह हिसाब से इतना बढ़िया Class AB amp इस कीमत पर मिलना बड़ी बात बा। Sound बढ़िया, बनावट मजबूत—पूरा पैसा वसूल। Sound quality पसंद करे वाला आम आदमी खातिर पूरी तरह recommend।

Update: The seller (Mr Ketan) was very helpful and kept his promise of repairing the amp under warranty. I had to only pay for the courier service which came to Rs 600. This amp is great and is better than class D amps like the Fosi Audio TP-02 (which I also own). Going from that Fosi to this, did feel like a step up. Will update this review by year end and hope it will work fine for long. For now, back to 5 stars! (previous was 3). Thanks Mr Ketan for the support. I received this item at the start of November and was amazed by the quality of bass it put out. I converted my active Edifier T5 (which had conked off) to passive after Mr Ketan put that idea in my head on call. He was very polite and helpful. This thing made the T5 sound so much better. The bass was clear and hit with authority like the inbuilt T5 amp couldn't dream of doing. I even ordered his 12 inch sub to replace the T5 and the combination with this was fantastic. Mr Ketan wanted me to write a review but I got busy in December and then somehow put it as a to do thing later. Then I decided to wait after some months of use to give my review. Unfortunately this amp on its own, went up in smoke. While playing, I heard a bit of a 'thud' sound and then saw smoke coming out of the vents. It was toast. Wanted to give it 5 stars but this happened. I'm now using a spare fosi amp to power the woofer, which does the job well enough but it isn't as clean as this was. Not sure if it is worth attempting a repair, with courier costs to send it to Delhi and no guarantee if this can be repaired and sent back (whether the total cost of repair and courier services will be reasonable or almost like buying new).

Its giving good bass as compared to the back panel of active subwoofers. So active subwoofers are no longer worth it.

I was impressed after buying this product, I didn't think I would get it so good amplifier, its performance is much better than I thought and I liked it very much, I found this amplifier after a lot of searching, if you think you can definitely buy this amplifier, the best thing is that I got 100% support from Ketan Sir, you can get help anytime for any kind of problem, jab me yea amplifier ko first time purchase Kiya tha tab kuch din use karna ke baad kuch problem araha tha, shyad yea mera mistake tha kuki main sab kuch acha se notice nahi Kiya tha, tab main socha tha ki agar replacement Kalia dunga toh bohot time lagega esliye mara pass ek mechanic tha usko dhikaya , wo tik nahi kar paya, uske baad main 4d Furnishers ka help line number main call Kiya or sir ko Mera jitna problem hai wo sab bataya hai , photo or video banake v diya hai, uska bad sir bola tik hai yea amplifier ko return kar do hum log or ek new amplifier aapko baj denge or ek acha baat hai ki jo Amazon ka replacement date wo v expire nahi hua tha , jab or ek new amplifier Mila toh main sach mein believe nahi tha ki itna support milega mera ko, finale I'm very happy, thank you so much sir .

Bought it on december 12th, by jan 14th within 32days there was a burnt smell and amplifier stopped working, when contacted the selle, i was aked to courier it from chennai to delhi which would cost me Rs.1000 and theres no guarantee if the seller would repair and send it, so the warranty given is of no use only suitable for people residing in delhi since it is easier to get it serviced, i foresee that most amplifier would require a service within a year. Better not buy dince there is no service support out of delhi

First of all i tried contacting seller before purchase to get guidance on various models before purchase and owner guided me well to arrive at this model which suits my purchase. Now coming to product I am looking for a subamp for my 12 inch jbl passive sub which i used for my car and when i tested with my setup, Initially product sounded muffled as i connected my fosi audio BL20C sub preout as input to this amp. Called him and he suggested that my amp might send low input signal which i don’t understand how to make it high as my amp only has preout and cannot increase gain. Later owner suggested me to use a impedence converter to solve this problem which we use in car audio and further requesting , he sent the same product low cost to me which was really appreciative. Once i received he also assisted me on how to connect it to my amp as i connect it parallely to my existing front input. Once all this is done then comes the sound output. My woofer is power hungry as its a 4 ohm 12 inch jbl aub in a big enclosure and the amp drives it well . Able to achive low as good as 30hz and now my setup came to live. Really appreciate the extra mile seller went by answering all my queries and even connected with me in calls during setup and ensuring that i get what i want.

12 inch sub run distraction get 30% plus

Excellent