What affects the wireless range?

The wireless range is “room to room” 20m, in same room 50m, and, in open space, 100m. The range depends on your type of walls, for example steel reinforced concrete has large negative effect. Wood and dry walls have less effect on the range. If there are many Wi-Fi networks in the area, this can also reduce range.

Can I mix LIVING speakers with TX-100 and RX-100 dongles?

Yes, these products use the same network. If you have a Living speaker system, you can add RX-100 receiver to expand your wireless network to more products.

Can I adjust volume in different zones/rooms?

Yes, but only LIVING speakers have the Zone volume control feature. The volume is controlled by the enclosed remote. With TX-100 and RX-100, you have to use the volume of the device to which the transmitter dongle is connected.

Why can’t I use the USB 2.0 input on my stereo for the RX-100 receiver?

The RX-100 has only one analogue output and the USB connector is only used to power the dongle. RX-100 receiver should always be connected via cable to the receiving item, as well as to a USB power supply.

What operating systems are supported?

Windows XP (min. service pack 2), Vista, Windows 7 and Mac, with OS X 10.xx

What can I connect to the “TX-100 and RX-100″ system?

As these dongles incorporate A/D and D/A converters and analogue input/output, you can connect the TX-100 transmitter to any analogue sound sources and the RX-100 receiver to any device with sound inputs.

What music files are supported?

TX-100 and RX-100 incorporate advanced Burr-Brown A/D and D/A converters and can be used to play all types of sound file formats. Even uncompressed music files such as FLAC and Apple Lossless will play with full CD quality.

Can I connect Living speakers to my stereo?

Yes. The easiest way is to connect the TX-100 transmitter, via cable, to any Tape-Out, or Preamp-Out or to the headphones jack, and then connect the dongle to an USB power supply.  If the source of sound has a fixed level, you will adjust the volume on your Living speakers, by using the small remote of the speakers.

Can I adjust volume on the RX-100 receiver?

No, RX-100 cannot itself adjust volume level. In this case, use the volume of the device to which the RX-100 is connected.

Do I need to install any software?

No, no software is needed. Just plug n’ play!

How does the network avoid interference?

The audio pro network uses a dedicated proprietary protocol.
Using frequency hopping before listening, we switch channels before we get any interference. We progressively monitor our audio bands.
We have a built-in “sniffer” system to sniff out any other wireless channels which may potentially give interference. This “sniffer” system automatically jumps between free RF (Radio Frequency) channels so no noise interference will occur. This ensures that the Audio Pro network will seamlessly coexist with other wireless systems. We have built-in security that filters all unnecessary RF interference from other wireless networks.
There are 2 built-in antennas which work like a diversity antenna. By having these, we can automatically select the strongest signal on not only the RF channels but also on the antennas as well. If any interference is present on one antenna we will automatically switch to the other antenna.
Our bandwidth is 1.6 Mb per House-Code channel. All audio is run at 48kHz to provide top audio performance.

What is the meaning of “no audible time-delay”?

The audio pro network is very fast. Time delay is a mere 15ms, not audible by the human ear. This means that if you send audio to multiple receiving units as Living speakers or the RX-100, you will not hear any delays in the audio sent.
Note: for modern home-theatre receivers, time delay can occur due to longer sound processing of the audio signal in the home-theatre receiver. The delay only occurs when transmitting wirelessly to a home-theatre receiver, not sending wirelessly from the receiver to Living loudspeakers or RX-100.
Delay problems with home-theatre receivers are only audible when using a RX-100 receiver or Living speakers at the same time as the home-theatre receiver. Living speakers and RX-100 process the sound signal faster than a home-theatre receiver.

Are you using more than one TX-100 transmitter?

Make sure that the TX-100s aren’t running on the same House Code. If more than one TX-100 is used, with the same House Code, interference may occur. To solve the problem, you set up the three dongles with a different House Code.

Are you using the same House Code on transmitter and receiver?

Yes, be sure to set the same House Code on both the transmitter and the receiver.

How far apart are the transmitter and receiver?

If distance between the transmitter and receiver is too much, the connection might be lost. Try to relocate the transmitter and the receiver, in order to reduce the distance between them, or just buy the range-extender WR-200.

Are there walls between the transmitter and receiver?

If your home has thick concrete walls, or walls of plaster with wire lath, the wireless range will decrease, so, as said above, try to relocate the transmitter and the receiver, in order to reduce the distance between them, or just buy the range-extender WR-200.

There are many wireless networks in the area.

If there are many Wi-Fi networks running in the area, wireless range can decrease. There are useful apps for iPhone/iPad/iPod touch and Android, to detect local Wi-Fi networks, and see which channel might be crowded.
You can also try to change the channel on your wireless router to improve audio pro network range and your own home network Wi-Fi performance. audio pro network transmits on channel 1-6-11.

Are you using MAC or PC?

If you use MacBook Pro or Mac Mini, there can be conflicts with the internal Wi-Fi network cards in the computer. This is because the USB sockets are too close to the internal network card. Try connecting the TX-100 by cable to the headphone jack (and to USB power supply) and place the TX-100 away from your computer, does this help?

Is your computer connected to the internet via cable or Wi-Fi?

The audio pro network can weaken a local Wi-Fi network (but not weaken itself).
If possible, you should change channel on your wireless router, the audio pro network transmits on channel 1, 6, or 11. Choose a new channel on your router, for example 3, 8 or 13. In total there are 13 channels on the 2.4GHz band.
If you cannot change the channel on your wireless router, try connecting computer via Ethernet cable instead.

Are there Bluetooth units active in the area?

Shut down all active Bluetooth devices. Does this help? Becomes the LED light on the transmitter blue?
If the light is red, try moving the transmitter and receiver closer together. Does this turn the LED blue?

Windows 7 and Mac OS, select sound output

When connecting the TX-100 transmitter to a computer using Windows 7 or Mac OS, you need to select the sound output. Go to: system settings, find sound settings, and select USB HEADSET as your sound output. In older Windows, OS there is no need for this, TX-100 will take over automatically as the sound output device.


How do Audio Pro speakers compare to other leading brands?

Since 1978 we have created loudspeakers that have gained acclaim, both within the trade press and among our customers. As audio pro products are continuously being tested in Hi-Fi magazines around the world, it’s worth checking our web site every so often for new tests and the latest word. To give you the opportunity to read the entire test, we always tell what magazine and issue the test has been published in. But remember: you must be the final judge! Visit a quality Hi-Fi retailer, and let your ears, your plans and your pocketbook guide you to good sound in your home and your everyday life.

Who have I to contact if I need service or spare parts?

If your audio pro item needs service or spare parts, always contact the distributor in your country, especially for warranty issues.

Can I still get spare parts for my very old Audio Pro speakers?

Availability of spare parts depends on how old your speakers are. Anyway, we normally have spare parts for very old speakers, but lately we ran out of few very old drivers and if you are unlucky … However, as said before, always ask the distributor in your country.

I have lost the manual that came with my audio pro speakers. How do I get a new one?

Speaker manuals can be downloaded in PDF format from our website If you don’t find your manual here, go to the ‘Contact’ page of the web site and fill in the questionnaire you find there.

What amplifier should I use with my audio pro speakers?

The sound quality of your system will never be better than its weakest link. If you spend good money on high-quality speakers, then you should be sure that the rest of your system is of comparable quality. Nowadays, the quality of the commercial amps is quite similar, so choose a well-recognized brand. Anyway, always let your ears be the final judge!
The label on the back of each speaker states the power capacity of the amplifier that should be connected to it. This website also provides detailed technical information about the recommended amplifier capacity for each speaker in our range. However, when you want to know how well an amplifier can drive a speaker, the amplifier’s current capacity (measured in Ampere) is more important than its power (measured in Watt).
Anyway, the best thing you can do, is to contact our local distributor and ask for a serious and unbiased advice!

Power, or current – which is most important for an amplifier?

One of the most used terms in hi-fi is ‘Watt’, the unit that describes how much electric energy an amplifier can deliver per second to a speaker, and how much energy per second the speaker is capable of receiving. But Watt is a measure of quantity — how loud the music can be played — rather than quality. The amplifier’s quality is more closely related to its ability to deliver “current” to the speaker. A speaker needs current in order to be able to transform the electrical signal into music that pleases the ear. Current strength is measured in Ampere, and the more current the amplifier can deliver to the speaker, the better the speaker will reproduce the music. Unfortunately, the majority of the manufacturers of amplifiers, don’t usually mention this parameter among the other technical specifications, probably to avoid cutting a poor figure.

What is impedance?

Impedance is a measure of resistance. The speaker’s impedance defines how difficult the speaker is to run and is measured in Ohm. The speaker’s impedance — or better, electrical resistance as a function of the frequency — is a measure of the electrical load placed on the amplifier by the speaker. The greater the impedance, the smaller the amount of current flowing through the speaker.
A speaker’s normal impedance is 4 or 8 Ohm. This means that a speaker with an impedance of 4 Ohm needs an amplifier that can deliver more current. The lower the impedance, the higher is the demand of current delivered by the amplifier.

Will I have any problems with audio pro 4-Ohm speakers?

Many audio pro loudspeakers are designed as 4-Ohm. We mark a speaker 4-Ohm, if its impedance measures less than 6.4 Ohm. If your amplifier is of quite good quality, there won’t be any impedance problems. But, there are amplifiers where it’s specified, on the binding posts 8 to 16 Ohm, or sometimes just minimum 8 Ohm. These are clear indications that the amplifier is of very poor quality and cannot deliver good “current”! Never buy one of them, even if your speakers are marked 16 Ohm!! For instance, a 4-Ohm speaker can easily ‘empty’ an amplifier of its current reserve. Therefore, if you have to connect two pairs of speakers to the same amplifier, be sure that every single speaker features at least 8-Ohm impedance; in this case, the amplifier looks upon two pairs of 8-Ohm loudspeakers as a total 4 Ohm load. But, if you do that with 4-Ohm speakers and you want to play them together in parallel, the amplifier sees them as a very low 2-Ohm impedance, which is something very unpleasant for the majority of the amplifiers.
In a home-theatre system, there is no problem with 4-Ohm speakers, unless the receiver is of very poor quality (as said above). Using pathetic amplifiers with 4-Ohm speakers, there is the chance that, when the amplifier tries to deliver peaks of power, it will go quiet and into protection mode. Anyway, we don’t know of any case where the impedance caused problems in a home-theatre with audio pro speakers.

What speaker cable should I choose for my sound system?

Your sound system will never be better than the weakest component of the chain. If you have put your money into expensive electronics and speakers, you should also look at your choice of speaker cable. One of good quality can make a difference in how your speakers perform. The best cables are made of oxygen-free copper, which has excellent conductivity and they also come in different shapes and thicknesses. Choose a thick cable, between at least 12 – 16 AWG (American wire gauge), which suits most systems of good quality. Anyway, remember that the motto, or better a “must”, for the speaker cables is “the shorter, the better”!

How do I correctly connect my new speakers?

The wires between amplifier and speaker must always be 100% correctly connected. Otherwise your system will sound “funny”. Be sure you connect them “in phase”.
For example, if the wires of the right speaker are connected well, but the ones on the left speaker not (for example + to + on the right speaker and + to – on the left speaker), the drivers of the two speakers will move in opposition of phase. This means that when the cones of the drivers of a speaker are moving inwards, the cones of the drivers of the other speaker are moving outward. This condition produces a weak bass range and a feeling that something is not right in the whole sound department!

How to check if the phase is correct?

The easy way is to check the colours on the binding posts of the speakers and amplifier, but sometimes you cannot see easily the back panel of the amplifier and in this case there is a good empirical method to check it out: turn the speakers so that their front panels watch each other and also place them very close (around 50cm). Now, play some music with some strong bass content and if the bass is very weak, your speakers are wrongly connected. Invert the polarity of the wires on one of the speakers (not both and possibly on the wrong one!) and if the bass now sounds much “fuller”, they are now in phase!
Anyway, the method mentioned above is valid only if you don’t have a sub-woofer. If you have a sub, the phase has to be “absolute”, in order to avoid opposition of phase between the speakers and the sub. So, in this case you have to check perfectly the colours (+ on red and – on black) on the speakers and the binding posts of the amp too.

My brand-new speakers sound ‘wooden’ and all-round poor. Is there something wrong with them?

This is not a fault of the loudspeaker. A brand new speaker has never been used, and the suspensions of its drivers are stiff. It may result in a slightly unsatisfactory sound. Like a new car, the speaker needs to be ‘broken in’, and the more it is played the better it will sound. A good rule is to not judge the speaker until properly broken in, and this may take from 100 to 200 hours of playing time, depending on the type of the suspension of the drivers. To expedite this process you might, for example, switch on your radio before leaving for work, and let it ‘exercise’ the speakers until you come home. Every so often, it’s also good to “push” the speakers at quite loud level, for a limited time (around 15 minutes). If you nonetheless feel that an unsatisfactory sound reproduction is due to a fault of the loudspeaker, you should contact your local distributor.

Bookshelf or satellite speakers versus larger floorstander models?

It depends: a loudspeaker must move a lot of air in order to achieve a decent bass response. The larger the cabinet, the more air the speaker can move, but sound quality is also affected by the speaker’s quality – the cabinet’s composition, construction and shape, and the speaker’s components and design. Furthermore, the speaker’s location, the room shape, the pieces of furniture and the type of floor will affect the sound. If the room is sufficiently large and you have no objection to prominent loudspeakers, bigger speakers will sound very good (if they are good). Smaller speakers better suit a more limited space and, because of their small size, they can usually be easily moved until you find a fully satisfactory sonic image. Small speakers or satellites (without a sub-woofer) cannot be played as loud as larger speakers, because they are unable to reproduce the entire lower bass range. For this reason, a perfectly tuned audio pro sub-woofer is a worthwhile addition to small or satellite speakers! An incredible metamorphosis happens, and the final result is much better than the one achievable with massive, traditional (with no sub inside), crazily expensive floor-standers! For more information about this topic, please visit

Do I need a sub-woofer?

A sub-woofer is a speaker specifically designed to reproduce low bass tone – frequencies below 100 Hz. By adding a sub-woofer to your speaker system, you will direct the deep bass register to it. This reduces the load placed on the main speakers, enabling them to more faithfully reproduce the mid-range and treble registers, due to the reduced distortion in the speakers. The final result is a clear improvement in overall sound reproduction, and you will discover sounds that you never heard before in your old discs and films. Please note that big speakers need a sub-woofer too, in order to clean their “booming” bass and extend the infra-bass. This happens only if the sub-woofer is perfectly tuned into the system and … possibly audio pro!

What does audio pro ACE-bass® technology do?

ACE-bass® technology gave audio pro its start thirty-six years ago, and the problem it has solved, is still present and unsolved in subs and floorstanding speakers not audio pro. Bass reproduction requires moving large volumes of air, which dictates large, obtrusive enclosures and drivers. ACE-bass technology enables us to build sub-woofers that deliver a deep, clean, fast and low-distortion, powerful bass reproduction, from a surprisingly small enclosure and drivers. ACE-bass uses electronic means to affect, in real time, the driver’s mechanical parameters in such a way that the driver ‘believes’ that is working in a much larger enclosure than the real one. Our subs are the best option available on the market for reasonable price and they perfectly suit stereo hi-end systems and home-theatre sound systems.

How can I hook up my powered sub-woofer?

Connection to amplifiers without sub-out.
Connect left and right speaker cables from the amplifier, to left and right Speaker IN on the sub-woofer. Then connect the cables from left and right Speaker OUT of the sub-woofer to the respective speakers. This allows an audio pro sub-woofer to be connected to the system in the right way (even if not perfect). Speakers that are connected this way have a roll-off on their bass range at approx. 120Hz (called HI-PASS), in order to match the crossover point of the sub-woofer.

Connection to amplifiers with Sub-Out socket.
Connect, via the enclosed screened cable, the amplifier’s SUB-OUT to LINE IN on the sub-woofer. If possible (home-theatre receivers), select for all the speakers (in the Speakers Set Up) the option Small Speakers.
With the LO-PASS frequency control, you can adjust the frequency of the roll-off of the sub-woofer. If you use this type of connection, be sure that the amplifier or receiver feature the possibility of rolling-off electronically the speakers. Anyway, this topic is not as simple as it appears!

Which Audio Pro sub-woofer should I choose?

All the audio pro sub-woofers provide a “superior” infra-bass range and can be used for both hi-fi and home-theatre systems. The best advice we can give you is to choose a sub which matches (in dimension) the dimensions of your listening room: you can put a large sub in a small room, but not a small sub in a big room. Another “best advice” (probably more important than the previous one) is to integrate the sub-woofer into the system to perfection! This is essential to obtain superior sound from your system!

If you want to have exhaustive answers to the problems mentioned in these paragraphs, please visit and contact Franco Viganoni.