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Description
audison SR 4.300Audison SR 4. 300 4 channel amplifier with crossover and great power packed into ultra compact dimensions (85 W x 4 4?) SR line, perfected by taking full advantage of the capabilities of the latest amplification devices. After numerous listening tests with professionals and enthusiasts, Audison's R&D team decided to adopt a new class D technology called ADT (Audison D Class Technology) for this line of amplifiers, which has made it possible to
Audison SR 4.300 4-channel amplifier with crossover and great power packed into ultra-compact dimensions (85 W x 4 4?)
SR line, perfected by taking full advantage of the capabilities of the latest amplification devices. After numerous listening tests with professionals and enthusiasts, Audison's R&D team decided to adopt a new class D technology called ADT (Audison D-Class Technology) for this line of amplifiers, which has made it possible to considerably reduce their size, totally preserving the audio performance that characterises every Audison design.
As far as the electronic design is concerned, every aesthetic and functional detail of the Audison SR 4.300 has been taken care of, resulting in a compact amplifier made of extruded aluminium with rounded corners, which facilitates the installation of the product in narrow spaces. Thanks to the generous heat sinks on the two short sides of the amplifiers, there is no need for internal cooling fans, which often cause noise and dust accumulation.
In keeping with tradition, the SR amplifiers confirm their vocation for versatility by including on all models a complete filter section, suitable for any kind of audio system configuration. The controls, protected by a satin-finished aluminium panel, are located on the top panel of the amplifier, so that they can be easily reached from above, even after the product has been installed. When the system includes an Audison bit processor, the filter section can be totally excluded.
Audison USS
Thanks to the integration of Audison USS (Universal Speakers Simulator) technology in the high level inputs, the SR amplifiers can also be conveniently connected to OEM sources equipped with the 'speaker load detection' function, which monitors the presence of a low impedance load enabling the audio outputs.
Audison SR 4.300 allows multiple connectivity
All models have balanced high-level inputs for connecting to the OEM headunit speaker output and a low-level RCA for after-market speakers. When using the high-level input, the ART (Automatic Remote On/Off) function can be enabled to control the amplifiers' power-up with the headunit's power button. In addition, there is a remote IN / OUT socket to allow control of multiple amplifiers in cascade that turn on when needed.
Through the PRE-OUT signal using the Speaker-IN socket it is possible to interface the amplifier with OEM sources that only have amplified outputs, allowing for system expansion.
SR line, perfected by taking full advantage of the capabilities of the latest amplification devices. After numerous listening tests with professionals and enthusiasts, Audison's R&D team decided to adopt a new class D technology called ADT (Audison D-Class Technology) for this line of amplifiers, which has made it possible to considerably reduce their size, totally preserving the audio performance that characterises every Audison design.
As far as the electronic design is concerned, every aesthetic and functional detail of the Audison SR 4.300 has been taken care of, resulting in a compact amplifier made of extruded aluminium with rounded corners, which facilitates the installation of the product in narrow spaces. Thanks to the generous heat sinks on the two short sides of the amplifiers, there is no need for internal cooling fans, which often cause noise and dust accumulation.
In keeping with tradition, the SR amplifiers confirm their vocation for versatility by including on all models a complete filter section, suitable for any kind of audio system configuration. The controls, protected by a satin-finished aluminium panel, are located on the top panel of the amplifier, so that they can be easily reached from above, even after the product has been installed. When the system includes an Audison bit processor, the filter section can be totally excluded.
Audison USS
Thanks to the integration of Audison USS (Universal Speakers Simulator) technology in the high level inputs, the SR amplifiers can also be conveniently connected to OEM sources equipped with the 'speaker load detection' function, which monitors the presence of a low impedance load enabling the audio outputs.
Audison SR 4.300 allows multiple connectivity
All models have balanced high-level inputs for connecting to the OEM headunit speaker output and a low-level RCA for after-market speakers. When using the high-level input, the ART (Automatic Remote On/Off) function can be enabled to control the amplifiers' power-up with the headunit's power button. In addition, there is a remote IN / OUT socket to allow control of multiple amplifiers in cascade that turn on when needed.
Through the PRE-OUT signal using the Speaker-IN socket it is possible to interface the amplifier with OEM sources that only have amplified outputs, allowing for system expansion.
Amplifier Tech Data
| Channels | 4 |
| Class | D-Class |
| Hi Level Input | Yes |
| Low Level Input | Yes |
| Digital Input | No |
| Power supply voltage / fuse | 11 ÷ 15 VDC / 1 x 30A |
| Operating power supply voltage | 6.5V ÷17 VDC |
| Idling current | 1.6 A |
| Idling current when off | 0.03 mA |
| Consumption @ 14.4 VDC, 2?, Max Musical Power | 25 A |
| Remote OUT | 6.5 ÷ 15 VDC (150 mA) |
| Remote IN | 6.5 ÷ 15 VDC (1 mA) |
| ART - Automatic Remote Turn on/off from OUTPUT BTL speakers (Selectable) | 1.5 ÷ 7 VDC |
Amplifier Stage
| Distortion - THD @ 100 Hz, 4?, 70% Rated Power | 0.03% |
| Bandwidth A | 10Hz ÷ 35 kHz |
| S/N ratio A | 100 dBA |
| Damping factor A | 150 |
| Input sensitivity Pre-In | 0.2 ÷ 5 VRMS |
| Input sensitivity Speaker-In | 0.8 ÷ 20 VRMS |
| Total Power RMS | 520 W |
| Minimum load impedance |
@ 4Ch: 2? @ 3Ch: 2? + 2? + 4? @ 2Ch: 4? |
| Output Power (RMS) @14.4 VDC, 1% THD |
4Ch 85 W x 4 (4?) 4Ch 130 W x 4 (2?) 3Ch 80 W x 2 (4?) + 250 W x 1 (4?) 3Ch 130W x 2 (2?) + 260 W x 1 (4?) 2Ch 250 W x 2 (4?) |
| Adjustable Crossover | Yes |
CEA Specifications
| Output power @ 4?, 1% THD+N, 14.4 V | Output power @ 4?, 1% THD+N, 14.4 V: 75 W x 4 Ch |
| SN ratio (ref. 1W output) | SN ratio (ref. 1W output): 82 dBA |
Inputs
| Input Type | Pre-In / Speaker-In |
| Filters Outputs | PRE OUT full range (Input A) |
| Filter Pass A | Ch Filters: - Full Hi-pass: 50 ÷ 3.2k Hz @ 12 dB/Oct. |
| Filter Pass B | Ch Filters: - Lo-pass: 50 ÷ 3.2k Hz @ 12 dB/Oct. |
| Filter Pass C | Ch Filters: - Full Hi-pass: 50 ÷ 3.2k Hz @ 12 dB/Oct. |
| Filter Pass D | Ch Filters: - Lo-pass: 50 ÷ 3.2k Hz @ 12 dB/Oct. |
| Channel Mono | A/B Ch MONO IN (on/off) Yes |
| Inputs/Outputs Bass Boost | B Ch (0 ÷12) dB |
Other
| Weight | 1.56 kg |
Features
- Elegant and functional design with rounded corners to minimize space, facilitating installation.
- Built-in USS (Universal Speakers Simulator).
- Full built-in crossover section.
- Balanced high-level inputs for connecting to the OEM head unit speaker output
- Low-level RCA for after-market speakers.
- ART (Automatic Remote On/Off) function.
- Remote IN / OUT socket to allow control of multiple amplifiers.
- PRE-OUT allows for system expansion.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.5 ★★★★★
Based on 15 reviews
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Product Reviews
★★★★★ 1
Screen Stopped Working Amazon Denied Refund
Color: Black
I bought this phone 2 months ago and within a week the screen stopped working. It stopped responding to any touch. I sent it back to Amazon in its original physical condition in its original packaging and ordered a second one. The second one has battery issues where it randomly starts heating up and dies within a couple of hours. Just found out amazon denied my return because they said the phone was damaged. It was not. I love the idea of the phone but the execution is poor and because there's no reliable way to get replacements I definitely would not recommend risking it.
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Reviewed in the United States on May 28, 2026
★★★★★ 5
Works on Visible (Verizon)
Color: Black
For the price, this little device offers no compromises aside from the obvious. It's quick, offers a full day of battery life, and has a feature set to rival much more expensive competition. The screen despite it's size is fully usable for my every day tasks. Texting, web browsing, reading comics, etc are all viable if you have the eyes for it. The build quality is great. This reminds me of an old Nokia in the hand. I've also had no signal problems in rural Appalachia.
And yes, it *does* work on Verizon, but you'll need another phone to activate the sim with before transferring it over.
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Reviewed in the United States on March 11, 2026
★★★★★ 5
The phone work is compatible with MetroPCS by T-Mobile or Verizon
Color: Black
It seems to be a very good quality the compatibility is just like a larger phone and it seems to be durable and compatible the size it's all right yes I would recommend other people use it or buy it because it's really not an inconvenient item
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Reviewed in the United States on April 15, 2026
★★★★★ 5
Cut your screen time without sacrificing convenience
Color: Blue
I've been wanting to switch to a "Dumb" phone to cut back on my screen time, but I was nervous about needing navigation and the internet away from home.
Well! The Jelly Star is a fantastic solution.
Cons:
-Obviously, typing can be quite difficult. But the audio transcription features work very well.
-The small screen means that every small finger gesture can trigger an unintended action
Pros:
-No loss of function. This phone can do 98% of anything a full size phone can do.
-Cut screen time immediately
I read a lot about this phone, but still wasn't sure what it could handle. My main goal was to cut screen time so I took a shot on it.
Right out of the box I was surprised at how "normal" it was in every way but the size and shape. I was able to still use all of the apps I used on my old phone, I could set up my home screen with widgets I had before, and download the same custom ringtones. Even the youtube popup viewing window, screen recording, messenger! It feels exactly the same to use as any other android phone, just incredibly small.
The camera, audio, fingerprint scanner and microphone are all meh, but completely acceptable for a fully functional smartphone that cost $200.
Now, did it help with screen time? YES! Right away I really lost the desire to get "stuck" watching videos. The phone doesn't take up much of your field of vision; its hard to get sucked in and not be immediately distracted by the real world outside your screen. And as it was intended, the small phone screen (while serviceable in every way), just isn't much fun to be on.
Typing on this phone is a bit slow and methodic, I make more phone calls and speak to people in my life a bit more regularly.
And of course, I still crave entertainment but I have been choosing more audio books, music and podcasts over scrolling on tiktok/instagram/facebook.
Having only had this phone a short time, I am blown away by how both effective and usable it is! If you want to cut down on screen time but not give up the convenience of a smart phone, this is the phone for you!
For the price it comes with a screen protector (Applied), and extra screen protector, case, cable, brick, and a strap! It comes fully protected out of the box.
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Reviewed in the United States on January 12, 2026
★★★★★ 5
Excellent training Collar and very accurate
Style: Alpha TT 25
I paired this collar with a Pro 550 Plus and they work excellent together for training with my German shorthaired. Very easy to pair and use one you learn all of the functions. The layout of the low/med/high stimulation is easy to get used to for training and the correction of bad behavior and provides peace of mind when working with a young dog off leash. The gps is very accurate down to the foot. The light feature is awesome at night and is very bright. The battery in the collar long outlives the remote. Used in some heavy rain and worked without issue. I have only paired and used one collar so far but highly recommend regardless of the price.
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Reviewed in the United States on December 30, 2024