Visaton ALTO III c specifications

I just want to leave some information at the moment, not describe everything. It's about the ALTO III c , with the latest database values for the chassis and the latest version of the Visaton crossover.

General

Connections

Tech nical data

Special features

Crossover Original (version 29.01.2014)

Note:

Crossover with Height adjustments

All switches open

S1 closed

S2 closed, S1 Position does not matter

All switches open, phase profile

This question arose. One suggestion was to connect a resistor to the loudspeaker in front. If then 2.2ohm, so that we come across (6Ohm *80%) 4.8Ohm .

2.2Ohm in the speaker cable

The changed frequency response

My tip Be careful:

These 6Ohm amplifiers are also amplifiers, they also deliver more current at lower impedance consumers, i.e. loudspeakers. But these amplifiers heat up faster at 4Ohm , because they are mostly prefabricated components that are really designed for a certain current consumption.

Example:

Amplifier 100W/6Ohm Nominal data: Voltage output amplifier when 100Watt at 6Ohm = root(100Watt x 6Ohm )= 24.495volts Outgoing current i=u/r = 24.495 volts / 6Ohm = 4.082 amperes

Now with other speakers: The voltage remains the same with the same position Volume controller: Incoming current I=U/ R = 24.495 Volts / 4Ohm = 6.124 Amperes Modified power output: P=U x I = 24.495Volts x 6.124Amperes = 150 watts

Heating in the amplifier: Most are class AB amplifiers (Rod Elliot amplifiers)with efficiency n=0.7. So 70% get on the line, 30% are spent in the amplifier.

Previously, with 6Ohm speakers, the 30Watt was there in the finished power amplifier module. Now with 4Ohm speakers, that's 45Watt in the finished power amplifier module. This is an increase in heat of +50%.

And what can be done? Believe me, these amplifiers are already built to the limit. Watching is probably the easiest thing. It is best to attach a termometer to the cooling fins of the amplifiers. I never touch cooling ribs like that. Is 40°C the limit? Because the core temperature of the prefabricated building blocks is much higher. I don't know a value table there. The best thing is to hang the 6Ohm speakers on it again, full load for 10 minutes and measure the temperature.

Then do the same with the new ones and slowly start with the load until the same temperature is reached.

In the end, you will also have the same 100 watt output amplifier. And a mark on the volume control, my new maximum position.

That's all I can think of. But I think you can live with it if you take it to heart.

Other models of the same series:

Manufacturer:Manufacturer name
Model:
Years of construction:
Manufactured in:
Color:
Dimensions (W/H/D):
Weight: X kg
Factory price approx.:

here are the List connection options, if known.

list the technical data here, if known.

here, if available

Phase progression between medium and good

Crossover original (version 29.01.2014)

For those it is too brilliant, this adjustment exists.
I tried it with suction circuit, but came up with no conclusive solution.
That's why this solution is in the path.
It is best to install the switches on the back.
- Phase progression is slightly deteriorated if old switches are open.
- Every switch on causes an improvement of the phase back to the original of Visaton.
- Amplitude progression can be increased in 2 half steps from flat to original by Visaton.
- When switch S2 is closed, it is again original Visaton, all values from the previous section apply again.
- Conversion costs: approx. 10,- Euro/box

Phase progression is slightly deteriorated if old switches are open.
Every switch on causes an improvement of the phase back to the original of Visaton.
Amplitude progression can be increased in 2 half steps from flat to original by Visaton.
When switch S2 is closed, it is again original Visaton, all values from the previous section apply again.
Conversion costs: approx. 10,- Euro/Box

I would mechanically separate the conductor track between 3.3 uF and 0.33 mH.
And then insert the new parts (S2, 0.15mH, 4.7Ohm , S1, 4.7Ohm ) with wire strands according to the scheme.
If necessary, somehow glue the parts to the soft with construction glue. Basta.
But do not glue coils on top of each other, they must have as much distance from each other as possible.