Amazon.com.mx:Opiniones de clientes: Fosi Audio Box X2 Preamplificador de fono para preamplificador de tocadiscos, preamplificador de fonógrafo MM con ganancia Gear Mini Audio estéreo Hi-Fi Preamplificador para reproductor de discos con fuente de alimentación de 12 V CC
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Para calcular la calificación global por estrellas y el desglose porcentual por estrellas, no utilizamos un promedio simple. En cambio, nuestro sistema considera aspectos como la fecha de la reseña y si el autor compró el artículo en Amazon. También se analizaron las reseñas para verificar la fiabilidad.
I have a decent Cambridge audio integrated amplifier with a built-in phono stage, and I bought this item as much out of curiosity as anything else to see what would happen if I inserted a phono preamp in the line. The results are pleasing on the whole, there is definitely an increase in fullness of the sound at the bottom end, particularly noticeable when listening at quieter volumes, perhaps getting more towards that vinyl Nirvana of 'warmth' that people like to wax lyrical about, and there certainly is an overall noticeable difference.
I understand this may be further enhanced by fiddling around with different valve sets as well. In this latter regard, I did at the same time purchase the ( allegedly) upgraded valves for an extra £15, but I was disappointed when I received these, as despite what it says on the Amazon website, these were not USA manufactured, made in China writ large on the box(!), so I returned these with a frustrated sense of misrepresentation, unusual for Amazon on the whole.
In terms of downsides, I do think that the increased fullness and warmth have come in terms of sacrificing some detail/ clarity at the top end, although as mentioned above the overall sound is still pleasing. I think it's probably very much a matter of personal taste; if you are used to digital music you will notice, more of a rounding off of the overall sound, but in some scenarios this could be handy to reign in excessively harsh treble. Horses for courses really.
On the whole I'm pleased with my purchase and expect I will be keeping this item.
UPDATE: I acquired another set of valves, Siemens NOS, from eBay, and these immediately lifted the sound further, the bottom end retained its clunk but sharpened up, and a lot more top end detail was revealed. So it does seem that whilst the base package is overall good value an extra £15-20 on better valves is money well spent, with European or American valves seeming to he the way to go.
So, it works very well out the box but alot better once the j2 valves it comes with are upgraded to the jan5654w type, much warmer sound. Well worth the money as is the upgrade. Id of preferred orange led's as opposed to the blue ones but that's a tiny nitpick.
I got this mostly for the novelty of the glowing blue valves. Comparing this to my other pre-amp (Cambridge Audio Alva Solo) this unit ramps up the bass quite a bit. Overall it sounds good and at this price is very good value.
Surprisingly good sounding phono preamp. Still not sure if its actually using the tubes to amplify the signal or if they are just a buffer or if they are just for show and its all solid state. Can't find any reliable information on the specifications, or reviews because you get an extra 18 month warranty for leaving a review. That is why there are so many reviews for this preamp. But all that aside, it really sounds great. I compared it to a solid state TCC phono preamp I had and it sounds much better. Less high end, but it actually has a wider sound stage. I did upgrade the tubes to GE 5654s and never tried the included cheaper Chinese tubes. Overall I'm quite impressed.
Buon prodotto che fa onestamente il suo lavoro. Si tratta di un preampli economico quindi non entro in valutazioni legate all'alta fedeltà che non avrebbero senso per un prodotto di questo tipo. Se il vostro scopo è quello i tornare ad assaporare l'ascolto dei vecchi vinili, consiglio l'acquisto. Anche esteticamente è un oggetto carino, le dimensioni ridotte non creano problemi di posizionamento.
The unit seems sensitive to ground loop hum. When I first plugged it in, I was very pleased. After about 10 minutes, a loud ground hum started. Turning off the unit would make it go away temporarily, but always returned within minutes.
I was able to resolve this by simply plugging the preamp into the same electrical outlet as the turntable and amp.
Now I'm enjoying the nice warm colour of this amp and rediscovering a lot of old vinyl that I forgot I owned.
Ho collegato l'apparecchio ad un modesto giradischi Auna Vintage (senza uscita per il cavo di terra) e ad un impianto surround 5.1. Attraverso i cavi rca-rca non è stato possibile collegarlo perchè il segnale era molto disturbato (amplificava il rumore del motorino del giradischi). Collegandolo tramite la porta jack ed alla rca del giradischi sono riuscito ad avere un suono senza disturbi, non eccellente in qualità (forse per la porta jack), ma migliore rispetto il collegamento diretto al surround.
First thing I did was add upgraded tubes to the highly recommended 6J1P-EV Voskhod NOS, (I got one pair from Slovakia for $30 but then found a NZ seller for $15), these military spec valves will last 10,000+ hrs as they are not driven hard.
Always wanted to go the next step from my mid-priced solid state equipment, I have been running my modified Rega Planar 3 into the phono stage of my Plinius pre-amp which I thought sounded pretty good. The Fosi smoothed the slightly analytical sound of my Micro-Line cartridge and put back a little euphonic warmth.
The only negative being on very busy passages with multiple instrument crescendos/congestion, it struggles a little to resolve the chaos.
It's strengths lie in vocal, jazz, chamber & acoustic music where there is a little air to breathe.
I think it is great value for money, it has 3 gain settings for lower output carts (though is not meant for low output Moving Coil carts).
Have not tried the stereo line in function, (still happily spinning my old jazz lp's) and like most tubes it will probably improve up to the 500 hr mark.