EUR 120,00 + EUR 7,49 de gastos de envío
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Alpine KTP-445 - Amplificador de audio (10 - 14 V)

4,4 de un máximo de 5 estrellas
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4,4 de un máximo de 5 estrellas 283 opiniones de clientes

Precio: EUR 120,00
Precio final del producto
Sólo queda(n) 1 en stock.
Vendido y enviado por SONIDO CAR AUDIO.
    Es adecuado para su  .
  • Haz clic aquí para comprobar si este product es compatible con tu modelo
  • 4 x 100 W MAX.
  • & fácil instalación plug play (no se necesita cable adicional)
  • Para todos los Alpine cabeza unidad desde 2005
  • Alta/baja Interruptor Selector de entrada
  • Compacto tamaño (W x H x D): 6,97 pulgadas (177 mm) x 1.38 pulgadas (35 mm) x 66 mm

Información de producto

Detalles técnicos
Nombre del modeloKTP-445
Año de fabricación2012
Peso del producto1,1 Kg
Dimensiones del producto23,5 x 19 x 8,3 cm
Número de modelo del productoKTP-445
Número de productoKTP-445
Tipo de memoria flashnein
Aparatos compatiblesCoche
Otras característicasIndicadores LED
Configuración del canal de sonido Surround del altavoz4.0
Potencia de salida90
Potencia eléctrica400 vatios
Pilas / baterías incluidasNo
Pilas / baterías necesariasNo
Descripción de la interfaz de redAlámbrico
Número de canales de salida del altavoz4
Tipo de conectorAlámbrico
Contiene líquidosNo
Incluye batería recargableNo
Incluye mandoNo
Información adicional
Clasificación en los más vendidos de Amazon nº1.198.472 en Electrónica (Ver los 100 más vendidos)
Restricciones de envíoEste producto se puede enviar a España y a otros países seleccionados.
Producto en desde14 de octubre de 2012
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Descripción del producto

Otras características:
Acorde RoHS: No
Canales de salida de audio: 4.0
Certificado Energy Star: No
Color del producto: Negro
Control de volumen: No
Divisor de frecuencias incorporado: No
Indicadores LED: No
Interruptor de encendido/apagado integrado: No
Potencia pico por canal: 100 W
Tecnología de conectividad: Alámbrico
Utilizar con: Coche
Voltaje de entrada DC: 10 - 14 V

Preguntas y respuestas de los clientes

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Opiniones de clientes más útiles en (beta) 4.4 de un máximo de 5 estrellas 283 opiniones
142 de 152 personas piensan que la opinión es útil
5.0 de un máximo de 5 estrellas For the money and power level, outstanding 7 de junio de 2014
Por K. Denninger - Publicado en
Compra verificada
So let's start with what this is NOT.

It is NOT a "big power" amp that is going to rattle your windows and piss off the neighbors. Nope. It's a small, Class "D" amp that roughly doubles to triples the power output of your existing head unit. To really take advantage of it you need RCA outputs from the head, although it will work with speaker-level outputs. This means that with a FACTORY head unit you will get much less than this amp can offer.

Let me explain -- an amplifier can only amplify what you feed it! If you feed it trash you get louder trash. Your head unit's amp is only so-so to start with (yes, even the expensive aftermarket ones because they figure if you care you'll use the preamp outputs instead!) so you're inherently limited. As a result if you want good sound quality you need RCA (pre-amp) outputs from whatever you're going to connect this to, and you also need to use decent-quality cables (don't waste your money on things like "monster" cables, but do get ones with 100% foil+braid shielding - you can tell they're reasonable in quality because they've got some thickness to them.)

Now let's talk about the amp itself. It's a Class "D" amp. A Class "D" amp is EXTREMELY efficient because the transistors in it are either "on" or "off." They thus dissipate very little power as heat. That's good. However, the way they work is by switching the power at extremely high speeds (typically at least 10x the maximum 20khz audible sound frequency) and then using a low-pass filter made up of reactive components to smooth the output. Due to the way these amplifiers work energy is reflected back up into the power supply as a natural part of their operation. You'll note that on the yellow (power) for this amp there is a black box with something inside it. That "something" is a choke (you can see the coil inside the box if you look carefully through the slot) and it is really important that you NOT cut it off! If you do there is a risk that some of the high-frequency energy the power supply generates inside the amp could be reflected back up into the car's power system. This is unlikely to make the car malfunction but you could easily wind up hearing it in the stereo's sound as it has a decent shot at making it into your head unit and if it does, it could color the sound (quite badly, in fact, especially in the high frequencies.) So in short don't cut that black box off the power wire in an attempt to shorten it up!

The (relatively) small size means you should be able to mount this amp under the dash or in another convenient place, and it's lack of heat generation means it won't overheat and cause trouble in that regard. It requires a 15A circuit (the fuse in it is a 15A one) so some care is required in terms of getting power to it, and of course a SOLID ground is necessary.

There is a set of DIP switches on the back side that set high-pass filtration if you want it (if you're routing low frequencies to a sub this may be helpful, although most head units have a decent high-pass filter in them as well) as well as whether you are using speaker-level or the RCA-level inputs. Again, I STRONGLY recommend against using speaker-level if you can avoid it.

As for sound level this amp will roughly add 3db over what a non-amplified head unit will produce. It's maximum power draw is 180 watts before the fuse blows, and it's rated 45W/ch -- while it can drive either 2 or 4 ohm loads there is no boost to output driving a 2ohm load as there is with some other amplifiers. It's not going to be a lot louder (doubling perceived sound level requires a 10db change -- and 10x the power!) but it will be somewhat louder and, more-importantly, MUCH cleaner audibly.

Make sure you correctly set the input attenuation by the input plug. If you have a 4 or 5V RCA output head unit you will need to turn those pots down quite a bit; if they're turned up too far you will raise the noise floor (and be able to hear it in the form of hiss) along with rendering a large part of your volume control on your head unit worthless since you'll run out of power in the amp first. The best way to set these is with an oscilloscope to be able to "see" the clipping, but few people do that -- as a guideline if you have a 4 or 5V output head unit (most modern units are either 4 or 5v in an attempt to get better noise immunity) having the input settings somewhere between 9 and 10 o-clock is probably about right. If you have low-level RCA outputs you will need to raise the setting commensurately.

Properly installed and set up this little amp is awesome for what it is. Just understand what it is and what you are and are not buying. It isn't a beast, but rather provides a nice but modest boost and a very material cleaning-up of sound quality without having to deal with everything that goes into mounting and dealing with the cooling and power requirements for a "traditional" Class AB car power amplifier.

For a bit over $100 that's pretty darn good.
2 de 2 personas piensan que la opinión es útil
5.0 de un máximo de 5 estrellas Tiny but powerful 4CH amp, easy to install 10 de febrero de 2017
Por D Dawley - Publicado en
Compra verificada
This little amp is amazing. It provides quite a bit of punch for its diminutive size. It has the capability to run off your car's power without having to run a cable from the battery. I was already running another cable so I did run a 10ga power cable to it just to be safe but if your head unit doesn't draw too much power you are supposed to be able to use it. It is very easy to install. On one side is the speaker, power, and ground connections, on the other is RCA jacks (which can be turned into line level inputs if your unit doesn't have RCA outputs) and remote lead. Be sure to use the remote connection on the input side, the one on the output side is for connecting a second amp (as the output from most head unit remote leads is not enough for more than 1 amp). I was able to mount the amp behind the dash using included tie wraps so no need to drill anything. The amp also comes with built in low pass filters and selections for whether using 2 channel or 4 and RCA or line level input selection.
I highly recommend this amp for giving extra punch to any aftermarket speakers you buy to replace OEM factory models. I wouldn't advise for factory speakers unless your factory head unit has poor output power.
The only con I could give the amp is with the intent being to mount in a hidden location that they didn't include a remote option to control the gain. With this in mind you will have to make your gain adjustments before final mounting of the amp and putting the dash back (or wherever you mount it if hidden away). Excellent price for the amp also.
131 de 135 personas piensan que la opinión es útil
5.0 de un máximo de 5 estrellas Looks confusing to install, but is actually straight forward 23 de octubre de 2012
Por Pete - Publicado en
I installed two of these this past weekend. Both in new Jeep Wranglers. When I pulled it out of the packaging I was confused. I'll give you some pointers on installing this.

First of all you will need 4xRCA outs coming from your head unit. Most (if not all) decent aftermarket stereos include these. There may be two more for the subwoofer.

There are two sides to the unit: the harness that plugs into the left is for your speakers, remote turn on lead, and power. All you have to do here is match up each wire with what comes off the wiring harness you bought for your stereo. Use solder to connect wires.

The harness that plugs into the right side is where the RCAs coming off the head unit plug in to. The RCA harnesses that come with the amplifier are labeled F/R, just make sure you match them up with the RCAs you have running off your head unit to the Alpine harnesses. When you have them connected you should test L/R and F/R on the head unit to make sure they are matched up properly.

You have to buy 2 sets of RCA cables as the amp does not come with them. After you buy your new RCA cables, run them from the back of your head unit, into the RCA adapter harness, then plug that into the right side of the Alpine amp.

That's it.

8 month update: Still works great and runs cool. It is still in my glove box without issue.

Almost 2016 update: Still works great!
5 de 5 personas piensan que la opinión es útil
5.0 de un máximo de 5 estrellas Do it! 24 de abril de 2014
Por Jessica Millea - Publicado en
Compra verificada
After much research I decided to pull the trigger on this amp for my 2011 F150 with stock head unit and aftermarket Infinity X Reference 5x7/6x8 door speakers. In using the factory head unit I had to use the speaker level inputs of the amp vs RCA's. I read suggestions to use line out converters for each speaker output from the head unit, I opted not to do this as I thought it was a wasted step and an unnecessary added cost. With this amp you don't need it, just use the speaker level input. Once the amp senses any current, it powers on and sends sound to the speakers. Quality and sound is great, very happy of the results vs the low cost of this unit. Mounted behind the glove box easily with room to spare. Connects to the power supply wire of the head unit and no need for the remote wire connection if using speaker level inputs. I found a factory ground at the base of the A pillar of the psgr side near the fuse box. Alpine technical support was great and got me a wiring harness diagram to assist in hooking up the amp. I would recommend this amp.
5.0 de un máximo de 5 estrellas Might be the perfect car amplifier. 28 de febrero de 2017
Por Mark G. - Publicado en
Compra verificada
This thing is super easy to install, it's compact and well built. Plenty of power for loud clean sound unless you need to make your trunk rattle. I have this power the two front speakers and then the two rear channel outputs power a passive Bazooka tube dual voice coil subwoofer (6.5" tube). People may joke at these things but if used properly, they sound great and are very compact. They aren't going to "bump" for you, but they will give you good, deep, solid, bass for regular music listening. The head unit deck powers the rear speakers.