Ashly JPB-2016 Manual

Ashly Højttaler JPB-2016

Læs gratis den danske manual til Ashly JPB-2016 (2 sider) i kategorien Højttaler. Denne vejledning er vurderet som hjælpsom af 8 personer og har en gennemsnitlig bedømmelse på 3.7 stjerner ud af 4.5 anmeldelser. Har du et spørgsmål om Ashly JPB-2016, eller vil du spørge andre brugere om produktet?

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JPB-2016 Common-Mode Speaker Line Filter

Introduction: The JPB-2016 Common Mode Speaker Line Filter is used to eliminate undesirable heterodyne tones caused by

capacitive coupling of multiple Class D power amplier outputs. Heterodyning is the combination of two or more frequencies to

create sum and difference tones, in this case within the audible range. Heterodyne tones can occur when output cables from more

than one Class D amplier are run close together over a long distance, even with no audio signal present. Ashly Class D ampliers

currently include all nX, NE two-channel, NE multi-channel, Pema, SRA, and TRA models. The JPB-2016 is wired using Neutrik®

speak-ON NL-2 or NL-4 type connectors.

Theory: The carrier signals on each output channel of an individual multi-channel Class-D amplier are typically synchronized, or

frequency “locked” to a single common carrier frequency (~ 300 KHz.). Therefore heterodyning between multiple channels of the

same physical amplier cannot occur. NOTE: The heterodyning mechanism is actually created by similar, but not exactly the same

high-frequency carrier signals feeding back into the outputs of each respective amplier. Those signals then interact inside the Class-D

amplier output stage which will then generate the heterodyne tones. i.e. If one amplier running a 300 MHz carrier leaks into the output

of another amplier running at 309 MHz, the ampliers can multiply those two signals together creating both sum and difference tones,

with the difference tone being only 9 KHz, which is within the range of hearing. (Sounding a little like an old AM radio.)

The JPB-2016 common-mode speaker line lter rejects high-frequency signals coming back into the power amplier output, not the

reverse. Because both + & - speaker lines are acting as antennas, and the 300 MHz carriers capacitively couple equally into both sides

of the speaker line, one good way to reject an incoming high-frequency carrier is to place a common-mode lter at the output which

will have virtually no effect on the differential-mode signal traveling from the amplier to the speaker, but will block common-mode

interference coming back into the amplier.

Because different “Model Series”, and brands of ampliers will most likely operate at different carrier frequencies, at least greater

than 20 KHz apart, the difference tones that high cannot be heard. The heterodyne tone problem is most often observed when running

multiple individual ampliers of the same exact model series, and then running their speaker lines closely together within the same

conduit or wire bundle for long-distance runs which will increase the capacitive crosstalk coupling between the speaker lines.

This is because running the speaker wires close together creates a capacitor. The longer the run the higher the capacitive coupling from

one line to another, and thereby one amp to another. This effect has been observed with closely bundled speaker lines running distances

as short as 75 feet but more typically occurs at lengths of 200 feet or more. NOTE: In all but the shortest speaker lines, separate Class-D

ampliers should NEVER share a common multi-core speaker cable. Multi-core speaker wire will maximize high-frequency crosstalk (i.e.

at 300 MHz) as distance increases, potentially exacerbating the problem of heterodyning between the ampliers. Multi-core speaker wire

will work perfectly ne in the audio range, and will not create the potential for heterodyning when wired from a single Class-D multi-

channel amp (2, 4, 8, channels etc), however using multi-core speaker wire with separate Class-D ampliers where the carrier frequencies

may not be synchronized greatly increases the risk of heterodyne tones.

Produkt Specifikationer

Mærke:	Ashly
Kategori:	Højttaler
Model:	JPB-2016

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