User notes
The correct crossover points, time alignment and limiter settings are absolutely essential to achieve perfect sound and the safe working of the system. If you cant find what you need here we are happy to give advice and work out custom setups for your system. We can also write special presets for you to load into the Funktion One XO or XTA DP series controllers.
XO2 and XO4 series Loudspeaker Management Systems are loaded with a range of settings from the factory. These presets can be found in the ”Crossover Only” section of the Global Memory sub menu which can be accessed as follows:
XO2 and XO4 series Loudspeaker Management Systems are loaded with a range of settings from the factory.These presets can be found in the ”Crossover Only” section of the Global Memory sub menu which can be accessed as follows:
- Press Menu button, ”Global Memory submenu”
- Press Enter, ”Recall a memory”
- Press Enter, then press Next, Next, Next, Next, Next, ”Crossover Only”
- Press Enter
- Use Next and Back buttons or Freq knob to select the memory you want.
- Press Enter to recall.
If you can’t find what you need in the controller or on the Settings pages here on the website we will be happy to give advice and work out custom setups for your system. We can also write special presets for you to load into the Funktion One X0 or XTA DP series controllers
If anything is unclear please email us
Crossover points
The crossover points are an integral part of our system design and the time alignment figures are a manifestation of the relative physical location of the devices. Great care and attention has been taken in arriving at these settings with regard to alignment, phase, location and the physical parameters of the drivers and waveguides themselves. Where a delay between an enclosure and a separate Bass speaker is quoted, the figure is stated assuming that the fronts of the enclosures are aligned.
Speaker Time Alignment Delays
*Important* All values given in the Delay column are in milliseconds (mS). Funktion One crossovers have the option to set the delays in milliseconds, millimetres & metres or feet (displayed on the crossover units as mS, mm & Mt and feet respectively). Make sure the crossover is set to milliseconds when the delay values are entered. If the crossover is set to metres this produces an error of about x3!
System EQ? What system EQ?
There are no fixed inherent EQ settings for any of the drivers as these would degrade available headroom and phase coherence. We do not believe at all in fixing the loudspeakers’ response electronically; we prefer to take the time to get the speaker design right as this is in keeping with our purist approach.
Frequency Band Drive Levels
Relative drive levels are dependent on the amplifier’s through gain. For example: If a Resolution 2 is driven by two amplifiers (one for the 15” Bass and one for Mid-High) with the same through gain then, as you will see from the settings page, the Bass will need to be run at +8 dB relative to the Mid-Highs. In the real world however the two amplifiers may not have the same gain. For example if an amplifier with a gain of 38dB is used for Bass and another with a gain of 36dB is used for Mid-High then the Bass will need to be run at +6 dB relative to the Mid-Highs to maintain the correct ratio.
Limiters
Limiter settings are dependent on amplifier gain and sensitivity and the loudspeaker’s power handling ability. The most important thing is that the amplifier should never be allowed to run into continuous clip. Clipping squares off the output waveform of the amp, sending distortion in the form of harmonics through to the voice coil, this creates heat which if it continues will burn out the voice coil. Effectively a small amp in clip is more likely to damage a speaker than a large amp running cleanly.
The XO2 and 4 and the DP4 series loudspeaker management systems have both RMS and Peak limiters. The RMS limiter is set using the calculator on this page; the Peak limiter can then be set to allow peaks of up to 6dB more than the RMS setting as long as the amplifier has the headroom to deliver these peaks. This means that ideally you would choose amplifiers that will allow peaks of 6dB above the RMS ratings of the drivers without clipping.
REMEMBER: The primary purpose of crossover band limiting is to protect the system from overdriving, sudden and unexpected high level signals and occasional larger than normal transients. It is not really intended to be used instead of compressors and therefore limit lights should not be flashing or on all the time. If a system is limiting heavily, audio quality and drive units will suffer. However, if set up carefully they can be used to ensure the system stays in its comfort zone, the frequency spectrum remains reasonably balanced and the maximum system level is controlled for aesthetic or environmental reasons.
Balanced sound ”On The Limit”
1. You’ve got your mix set up and ”in the pocket” then the singer gets a bit excited and shouts ”Hello (insert your town here)! Are we all having a good time??!” His vocal compressor is set at a low ratio (or there isn’t one) and you’re not quick enough on the fader to catch the sudden burst of level. Happily your system limiters are set a couple of dB before the clip point of the amps in accordance with the power handling of the drivers and the amps don’t clip.
2. A sudden burst of feedback from a vocal mic too near a side fill and the same thing happens.
3. An inexperienced guest engineer loses control of the mix and ends up running too loud, the limiters start flashing and we ask him to back off a bit, he’s surprised that it actually starts to sound louder when the masters are pulled down a little and the limiters stop pumping (how many times have I seen this).
In all these cases the limiters are set for system safety and nothing gets broken, all good but what does the system actually sound like and how loud is it when the limiters come into play?
Mid and HF horns are usually more efficient than low mid and bass drivers. Of course they handle less power but you can often get a situation where if everything is just set for safety the system is capable of being driven into a state of imbalance where it sounds bad and can even be way too loud for the venue and the safety of the people in it. Bass speakers these days can handle a massive amount of power (as long as it’s clean) so large amps are used and limiters set to stop clip from occurring. Mid and high limiters are set progressively tighter in respect to the drivers lesser power handling. It’s still a good idea to use a large amp though. Transient spikes, totally valid to the music like the hit of the snare or cymbal crashes can get past the limiters and this is good because the dynamics and excitement of the music are preserved and these transients are not long enough to overpower the driver as long as they’re not clipping. So what happens as the system comes up to full power. Often the bass will limit first, then as the system is driven harder the low mid starts to limit, the hi mids are still going strong as are the highs. If the bass limits 4 dB before the mid highs this is effectively the same as turning up the mid highs by 4dB, the balance of the system is completely wrong and all the hard work of tuning and sound check is wasted. The thing to do here is to tighten the limiters still further so that the mids and highs start to limit at around the same point as the bass. This way the frequency content of the music will be maintained when in the limiters, the mids stay at a level where they still relate to the low end. The settings for this will be different for live and club systems, you will want to leave a bit more headroom for the dynamics of live music. In a night club there may be noise restrictions or the owner may have an idea of how loud he wants the system to go. The principle is the same. In both cases run the system up to the required maximum level, reduce the limiters so that the limit lights are flashing then open up a dB or so to account for when the room is warm and full of people, come back later when the venue is running and fine tune if needed. Above all, lock the system to safeguard against tampering! Your system is now not only safe against damage, its also safe against being driven out of balance and sounding really bad.
Setting the Limiter
Now you may be thinking “So I know what to do when my system is running, but how should I set my limiters in the first place?”. Good question; below is a conversion calculator that provides the maximum limit setting that should be allowed:
*Important: Your limiter setting should NEVER exceed this value (i.e. be made less sensitive) and neither should it be fully relied on to protect the system. The final responsibility lies with the operator, only the person who stands in front of the system can tell what is really happening.
If you stay within the power of the attached table, follow the notes above and tighten limiters further to set an acceptable level which sounds sweet, you will almost certainly find yourself turning some of the limiters down below the speaker’s power ratings.
Once you have the system up and running the most important thing is to listen to the speakers, they’ll tell you if they’re getting too much power as they start to sound bad, generally a speaker will start to distort long before it actually destroys itself. If a bass speaker starts to “growl” then its reaching its mechanical limits and producing second harmonic distortion, so it needs to be turned down or limited earlier if you can’t control the maximum level with the fader (ie if the DJ is “in control”…)
Digital Crossovers
Another point is that digital crossovers need to be driven at the correct level to ensure maximum use of the resolution available because at low input drive levels fewer bits are used. Signal should be clearly visible on the input meters with the -6dB light flashing to get the best from the converters. Because Funktion One equipment is so intrinsically efficient (high conversion of amplifier energy into acoustic energy) we often need to reduce amplifier gain to achieve this. Signal to noise ratio will also be improved. A suitable amplifier input sensitivity to achieve this would be +10 dBu. If amplifier gain is reduced then limiters will need to be adjusted accordingly.
Many amplifiers have rear-panel or internal DIP switches to enable user-selection of input sensitivity which mean that this objective can be met whilst leaving the front panel gain control safely on maximum. A gain of 32dB is a good starting point, if you need to go for less then switch to 26dB.
*Warning* If the amp front panel controls are used to reduce gain and the limiters are reset to suit then great care must be taken not to turn the front panel gain control up again without re-adjusting the limiters. Crew or other operators must be made aware of this. In a ‘dry-hire’ environment it is probably not advisable to send a system out like this without locking the amplifier level controls to avoid unauthorised adjustment. If this isn’t possible, then the sonic advantages may have to be forgone.
AX88(1)
AX88 with F118/F218
Component | Delay (mS) | Polarity | High Pass Freq (Hz) | High Pass Type | Low Pass Freq (Hz) | Low Pass Type | Relative Gain (dB) |
---|---|---|---|---|---|---|---|
18″ | 0 | + | 20 | 24dB But | 180 | 24dB LR | +8 |
8″ + 1″ | 0.876 | + | 180 | 24dB LR | 32k | 24dBLR | 0 |
Setting the Limiters
Here is a calculator that will provide the maximum limiter settings that should be allowed. The power and impedance values that you need to enter can be found in the specifications on the individual product pages.
*Important: Your limiter setting should NEVER exceed this value (i.e. be made less sensitive) and neither should it be fully relied on to protect the system. The final responsibility lies with the operator, only the person who stands in front of the system can tell what is really happening.
If you stay within the power of the attached table, ‘follow the notes‘ and tighten limiters further to set an acceptable level which sounds sweet, you will almost certainly find yourself turning some of the limiters down below the speaker’s power ratings.
Once you have the system up and running the most important thing is to listen to the speakers, they’ll tell you if they’re getting too much power as they start to sound bad, generally a speaker will start to distort long before it actually destroys itself. If a bass speaker starts to “growl” then its reaching its mechanical limits and producing second harmonic distortion, so it needs to be turned down or limited earlier if you can’t control the maximum level with the fader (i.e. if the DJ is “in control”…)
XO1*
- XO1 user manual
- XO1 Preset File and Loader (New on 03-03-08 version: FUNR0016.BIN)
*Please note the XO1 is no longer available to purchase
XO2
- XO2 user manual (latest version June 2013 – Flie Loader info added)
- XO2 Preset File and Loader (New on August 2015 *updated* version:FUNKO2R0030.BIN)
XO4 & XO4A
- XO4 user manual (latest version June 2013 – Flie Loader info added)
- XO4 Preset File and Loader (New on August 2015 *updated* version:FUNKO4R0047.BIN)
- XTA’s AudioCore software***
- XTA’s AudioCore user manual***
**XO4A loader files are the same as the XO4.
***Not all the contents of Audiocore manual will correspond with the XO2 and XO4, OEM 4 Series, Audio Management Systems.
A4/A6
New Firmware for volume control unlock bug fix plus early limiter bug fix. If your amps drop a dB every time you unlock them or you are finding the limiter is coming in 3dB too early this is the fix!
Firmware and Preset files can now be loaded direct to A4/A6 amplifiers from the New FunktionNet Control Software. New firmware and help file included in download.
For A4 and A6 downloads, read the README file for instructions on how to load preset files.
A4
File Loader Program, Firmware File and Preset Files for:
(Firmware File is now included in FunktionNet Download, can be found in the program folder after install along with the help file)
A6
File Loader Program, Firmware File and Preset File for:
- Bass (A6 Bass Presets Dec 2008.BIN)
- Bass with Infras and Res2 Bass +8dB (A6 Bass Presets Infras and res2 bass +8 Dec 2008.BIN)
- Dance Stack F218s 20Hz Hi Pass Dec 2008 (A6 Dance Stack F218s 20Hz Hi Pass.BIN)
- Dance Stack F218s 45Hz Hi Pass (A6 Dance Stack F218s 45Hz Hi Pass for use with InfraBass Dec 2008.BIN)
- Dance Stack F221 (Dance Stack Bass F221 Dec 2008.BIN)
(Firmware File is now included in FunktionNet Download, can be found in the program folder after install along with the help file)
If you have any queries regarding presets and loader files or any of the links fail please email us.
This unique application offers the possibility to remote control up to 32 XTA Electronics® DP4-Series® Loudspeaker Management Systems from your iPhone® or iPod Touch® or iPad®. DP4 Mini is also available as a shrunk down application that allows read only access.
DP4Remote gives you control over the following functions of your device:
- Gain
- Mute
- Phase
- Delay
- xOver
- Parametric EQs
- Graphic EQs
- Limiters
- Routing
- Ganging
- Names
- Memory store, recall and erase
- Snapshot store, recall and erase
DP4Remote can sync with the devices in both ways. So you can either prepare a setting in forward or get the controllers data.
DP4Remote stores your offline edited data for later sync with your devices.
DP4Remote is compatible with Funktion One XO4A® Loudspeaker Management Systems as well as XTA Electronics DP448®, DP446®, DP444®controllers.
View your processor rack
Input and Output routing and levels
Design and edit your crossover settings
Design and edit parametric EQ and view the curves (full screen view available on iPad also)
Limiter control
Rockbaby Engineering
IMPORTANT NOTES:
- You will need a working wireless connection to your controller (tested with XTA Wiser2400® and Moxa N-Port 5110).
- For more than 4 devices a serial connection speed of 115kBaud is recommended.
- DP4Remote works with a maximum of 32 devices at a time.
- DP4Remote is a third party application (this means this application is not developed by XTA Electronics®).
- DP4Remote will work on any iPhone® / iPod touch® / iPad® with iPhone OS 5.1 or higher. Recommended devices are iPhone 4® / 4S® and iPad2®.
- Although well tested – this application remains a piece of software: rockbaby engineering will not take any responsibility for any issues that may occur using DP4Remote.
- XTA Electronics® DSP-algorithms are sensitive information to which we don´t have access. So please note that our graphical representation of parametric EQ´s and xOvers display the “standard” ones – those may vary a bit from XTA Electronics® unique and brilliant algorithms.