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Owner’s Manual

HPA-DAC4

Dante

Accessory Card

AtlasIED.com

– 3 –

Specifications are subject to change without notice.

1601 Jack McKay Blvd. • Ennis, Texas 75119 U.S.A.

Telephone: 800.876.3333 • Fax: 800.765.3435

Audio Applications

When installed, the HPA-DAC4 converts the HPA Series amplifier into a digital audio network

amplifier and makes the HPA Series amplifier the “go to” solution for a variety of applications

including:

• Restaurants

• Government facilities

• Schools

• Industrial facilities

• House of worship

Selecting the dBFS Reference on the HPA-DAC4

The HPA-DAC4 comes with a choice of dBFS (Decibels Full Scale) gain selections of 0dBFS = 10dBu

and 0dBFS = 20dBu. Factory default for the card is 0dBFS = 20dBu. There is a 2-pin header on the

card that is the OdBFS gain selection. When a shunt is applied to the header, the 0dBFS = 20dBu

setting is engaged. When the shunt is removed the setting is 0dBFS = 10dBu. Most pro audio

equipment gains are in the range of 20dBu – 24dBu. Read the entire manual to understand these

settings.

Matching Gain from a Source to the HPA Series Amplifier In a Dante

Network

Understanding the gain structure is very important to avoid clipping the audio signal or amplifier

output. There are three potential ways to clip the signal chain.

Amplifier Input Clipping

- This occurs when the applied input signal exceeds the maximum input

level of the amplifier input stage.

Amplifier Output Clipping

- Driving the amplifier to maximum output level using the factory default

requires 0dBu or .775V of signal when the channel level control is set to maximum or the all up fully

clockwise.

Note:

AtlasIED recommends the level to be set with the level being controlled from

the source. Exceeding .775V or 0dBu level will cause the amplifier output stage to clip.

Digital Clipping

- This occurs when the 0dBFS levels are exceeded. This is very important to

understand. Several examples are provided to help understand digital to analog gain structure.

Note:

AtlasIED recommends to always place a limiter set for 0dB in the signal path prior to the

Network Output of the transmitting device. This is the best way to prevent clipping the HPA-DAC4.

Shunt on 0dBFS = 20dBu, factory default

Shunt off 0dBFS = 10dBu

Содержание Dante HPA-DAC4

Страница 1: ...al HPA DAC4 Dante Accessory Card AtlasIED com 1 Specifications are subject to change without notice 1601 Jack McKay Blvd Ennis Texas 75119 U S A Telephone 800 876 3333 Fax 800 765 3435 HPA DAC4 Dante Accessory Card ...

Страница 2: ...core cabling replacing it with low cost easily available CAT5e CAT6 or fiber optic cable for a simple lightweight and economical solution Dante integrates media and control for your entire system over a single standard IP network Dante systems can easily scale from a simple pairing of a console to a computer to large capacity networks running thousands of audio channels Because Dante uses logical ...

Страница 3: ... settings Matching Gain from a Source to the HPA Series Amplifier In a Dante Network Understanding the gain structure is very important to avoid clipping the audio signal or amplifier output There are three potential ways to clip the signal chain 1 Amplifier Input Clipping This occurs when the applied input signal exceeds the maximum input level of the amplifier input stage 2 Amplifier Output Clip...

Страница 4: ...he AC Mains source in order to prevent damage to the card or amplifier 2 Remove the two screws M3 x 8mm Pan Head Black holding the HPA Accessory blank panel 3 Remove the ribbon cable from the cover plate 4 Connect the accessory card to the ribbon cable by carefully aligning the ribbon cable connector to the mating PCB connector Do not force If aligned correctly the cable will mate easily 5 Careful...

Страница 5: ... the BlueBridge DSP is kept at 0dBu 3 The Dante Network output or Transmitter level is set for a maximum signal of 0dBu and remains the same through transmission through the network without any signal degradation or amplitude loss The input sensitivity of the HPA amplifiers is 0dBu 775V This means the analog input signal to the amp is set properly to achieve full power output from the amplifier wi...

Страница 6: ... clipping the amplifier input or the output HPA DAC4 card Note The best way to prevent clipping the HPA DAC4 is to place a limiter set for 0dB in the signal path prior to the network output of the transmitting device always recommended 2 Set the HPA DAC4 card to 0dBFS 20dBu The shunt needs to be on 3 Set the HPA amplifier input sensitivity to 775V This is the factory default setting 4 Set the HPA ...

Страница 7: ...tput is determined by a separate software called Dante Controller Dante Controller is free software that allows connectivity and signal routing within Dante devices Figure 6 shows the BB 88DT and HPA DAC4 on the Dante Network The HPA amplifier model number will not appear in the Dante Controller GUI because the amplifier is not the recognized Dante device the HPA DAC4 is The accessory card install...

Страница 8: ...t a limiter is placed before the network output This is shown in Figure 5 Set the limiter maximum output to 0dB This will prevent the amplifier input or HPA DAC4 from clipping but will be enough signal to achieve maximum amplifier output Note The HPA DAC4 clips at 7dBu 5 With the HPA front panel levels set to max increase the source level until the HPA Limit LEDs just begin to blink then back down...

Страница 9: ... at 100Hz there is only 4dB of headroom at 100Hz before clipping If the HPA DAC4 was set to 20dBu 0dFS there would be 14dB of headroom at 100Hz This is why it s so important to know the OdBFS reference points between devices in the Dante network 4 Industry Standard At the time of this information there is no industry standard between companies for scaling 0dBFS gain levels in equipment In a digita...

Страница 10: ...Transmitter product with good signal to noise ratio specification such as 100dB or better For instance AtlasIED BlueBridge DSP has a signal to noise ratio of 110dB The noise is very low before it is amplified assuring low noise out of the HPA amplifier Look at the input and output 0dBFs reference points and the noise floor specification If they are not listed call the manufacturer System Type 4 In...

Страница 11: ...wner s Manual HPA DAC4 Dante Accessory Card AtlasIED com 11 Specifications are subject to change without notice 1601 Jack McKay Blvd Ennis Texas 75119 U S A Telephone 800 876 3333 Fax 800 765 3435 Notes ...

Страница 12: ...policy set forth below When products returned to AtlasIED do not qualify for repair or replacement under our warranty repairs may be performed at prevailing costs for material and labor unless there is included with the returned product s a written request for an estimate of repair costs before any nonwarranty work is performed In the event of replacement or upon completion of repairs return shipm...

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