Sinfoni Presto Tempo User manual

PRESTO
AMPLIFIERS • OWNER’S GUIDE
Tempo

LINEA TEMPO PRESTO
PREFACE
INSTALLATION PROCEDURE
CONNECTION POWER SUPPLY
CONNECTION LOUDSPEAKERS
INPUTS
LIGHTS AND PROTECTIONS
03
05
06
07
11
12

OWNER’S MANUAL PREFACE
03
First of all, we would like to congratulate with you for your choice of our Sinfoni Tempo amplifier.
If you are reading this short introduction instead of madly flick across the pages of this handbook looking
for features like the weighted noise or the T.I.M., then maybe we have hit the target to unveil a little bit of
the philosophy of our laboratories. In fact, you will not find these figures among the characteristics of our
products mainly because it is our firm conviction that it is impossible to value such a product only on the
basis of plain numbers. It would be like guessing the taste of a dish reading just the list of its ingredients.
Only after a suitable “tasting” you will realize the striking sound properties of our products, and you will
appreciate their transparency, their musicality, their depth and all other aspects that probably, as a Sinfoni
purchaser, you already know. Try to describe it with cold technical parameters, if you can!
In order to get the utmost from our products, we recommend you to use only high-quality com-
ponents and cables: with a few adjustment every Sinfoni amplifier will give you unexpected emotions and
sensations. We kindly ask you to follow the indications mentioned in this handbook, and we wish you to
enjoy Music at best.

PREFACE
Tempo
03 04

OWNER’S MANUAL INSTALLATION
05
The Sinfoni car amplifiers are designed to work with a 12V DC power supply, however the
voltage can range from between 11V and 14.5V. Power Supply cables must be of a suitable gauge,
keeping in mind that the negative one must be connected to the ground in the nearest point of the car
chassis, while the positive one must come directly from the battery. If the distance from the battery to the
apparatus is quite long, then it will be necessary to use thicker cables, in order to avoid any performance
loss: we suggest your installer to use at least good quality AWG10 Oxygen Free Copper cables. The REM
input (remote) must be connected to the remote output of the source, which must provide at least a 60mA
current, for every installed Sinfoni unit.

INSTALLATION POWER SUPPLY
05 06
GROUND - CAR CHASSIS
SOURCE REMOTE
BATTERY POSITIVE

INSTALLATION CONNECTING LOUDSPEAKERS
07
The standard load impedance fitting to the amplitude series is 4Ω, but these amplifiers are
fearless of a lower impedance like the one that can be easily found in a car (three way systems or highly
reactive loudspeakers). Connecting a 2Ωload is not a problem, in fact, as it is possible to use a simulta-
neous stereo-mono configuration, then it is still possible to connect a 4ΩSubwoofer to a 4Ωsystem to
the bridged output. This would decrease the overall load to about 1,3Ωper channel. In such a case, a
suitable ventilation must be provided, as well as an adequate power supply cable, due to the strong impul-
sive current, ranging between 20A and 35A. The following images clearly show the possible connections.

CONNECTING LOUDSPEAKERS STEREO CONNECTION
07 08

CONNECTING LOUDSPEAKERS MONO CONNECTION
09

CONNECTING LOUDSPEAKERS STEREO + MONO CONNECTION
09 10
LOW PASS

INSTALLATION INPUTS
11
The input load is 48KΩ, and its sensitivity is adjustable from 400 mV peak - peak (150mV RMS)
to 8V peak - peak (2.8V RMS), therefore it perfectly matches any source, including those that provide a
4V pre out (1.4V RMS). The regulation is achieved rotating the input R and L potentiometers with a common
screwdriver. In order to obtain the BRIDGED MONO operation it is necessary to use a Y cable to reach the
two inputs, while in the simultaneous MONO-STEREO connection the use a passive low-pass filter before
the subwoofer is necessary. This will shield it from the high and medium frequencies, that are present in
stereophonic mode.

INSTALLATION LIGHTS AND PROTECTIONS
11 12
The LED nearby the power connector shows the presence of Remote signal. The thermal
protection prevents the amplifier from exceeding 75°C, in case of over-heating normal operations may
continue only after a temperature decrease of 10°C.
Internally, just behind the LED, you can find a fuse (20A) that can be easily reached disassem-
bling just the amplifier’s end-cap. In any case, its break is to be considered as an unlikely event, due only to
a serious failure, possibly caused by an improper use of the amplifier, or a power surge during connection
to the power source.

SPECIFICATIONS
13
POWER SUPPLY
STANDBY CURRENT
INPUT SENSIVITY
INPUT IMPEDANCE
OUTPUT POWER: 4 Ω@ 12/14,4 V
2 Ω@ 14,4 V
MONO 4 Ω@ 14,4 V
FREQUENCY RESPONSE
SIGNAL / NOISE RATIO
DIMENSIONS (W/H/D)
WEIGHT
9-15 VCC
< 1,2 A
0,4 - 8 V
48 KΩ
50/72 W X2
125 W X2
250 W X1
+/- 1dB FROM 10 HZ TO 30 KHZ
> 90 dB
226 X 40 X 187 (MM)
2 KG

13
produced by
AudioOggi s.n.c.
Via Roma70A/B,
62100 Macerata
www.sinfoni.com