Product Support

v4 Inline Troubleshooting

Most GigaFOIL v4 Inline issues clear up by unplugging the filter and plugging it back in. If that doesn't fix it, the steps below walk through the most common causes in order. Try them in order. Each step is something almost anyone can do.

Status

Out of Production

The GigaFOIL v4 Inline was discontinued and is no longer manufactured. DJM cannot repair existing units. If your Inline filter has failed, it cannot be sent back for service. Existing units remain covered under their original two-year warranty.

The troubleshooting steps below resolve most issues. If you've worked through them and your filter still isn't right, see your replacement options at the bottom of this page.

Before You Troubleshoot

The GigaFOIL v4 Inline only works with Ethernet, the kind of network signal your streamer uses to pull music from a server or a streaming service. It will not pass other signals that sometimes share the same kind of cable, like cable tester tones or older phone systems. The only real way to test the filter is to put it between two devices that you know speak Ethernet to each other and confirm they can still talk.

Troubleshooting

Step-by-step diagnosis

Try these in order. Most issues are resolved by Step 1 or Step 2.

Step 1

Confirm the power supply, then unplug the filter and plug it back in.

This step solves most issues, confirms the filter has the correct power supply, and uses the LEDs to tell you which part of the filter is alive.

Before you cycle the power, confirm you're using the 5VDC power supply that came with the filter. Audiophiles often swap power supplies for aftermarket ones, and many aftermarket supplies have a voltage selector switch that can get flipped to a different setting (12V, 9V, or other) without you noticing. The GigaFOIL v4 Inline requires 5VDC. If you've swapped the supply, double-check the rating, double-check any voltage selector, and if you have a multimeter, verify the output reads 5VDC or slightly higher. When in doubt, put the original supply that came with the filter back in service.

With the right power supply connected, pull the small barrel plug out of the filter, wait about ten seconds, and plug it back in. Watch the LEDs on both connectors.

If both green LEDs light, both circuit boards inside the filter are receiving power. The yellow LEDs (one on each connector) will start blinking once the filter establishes the Ethernet link to your network and your audio device.

If neither green LED lights and you've confirmed the power supply is correct, the filter has failed. GigaFOIL filters cannot be repaired; contact us about the upgrade path to the ACTIV 10G.

If only the input green LED lights and the output green LED stays dark, the output board has failed. Contact us.

If both green LEDs light but the yellow LEDs don't blink (or only one does), the power side is fine; continue to the steps below to diagnose the link.

Step 2

Restart the filter and your audio device together.

This step clears any stuck network address on your audio device that the filter reset alone won't fix.

If just resetting the filter didn't help, your audio device may be confused about its connection to the network (technically, it may have given itself a temporary network address called an APIPA address, in the 169.254.x.x range, when the connection briefly dropped, and is now stuck on it). Unplug the filter and turn off your audio device. Wait ten seconds. Power the filter back on first, give it about thirty seconds to come up, then turn the audio device back on. The audio device will ask the network for a fresh address on startup and rejoin normally.

Step 3

Restart everything from the network side and working downward toward your audio device.

This step restarts the entire chain in the right boot order so each device connects to a healthy upstream connection.

If neither reset worked, restart the whole chain in order. Power off your audio device, then unplug the filter, then power off your network switch or router (the box your home network plugs into). Wait ten seconds. Turn things back on starting from the switch or router, then the filter, then the audio device. Always start from the network side and work back toward your audio device, with each piece given a few seconds to come fully online before turning on the next.

Step 4

Check the cable connectors for bent or crushed pins.

This step rules out physical damage at the cable connectors before testing for cable or filter failure.

Look at both RJ-45 jacks on the filter (the square jacks the Ethernet cables plug into). Make sure the small metal pins inside are straight and even with no obstructions. If any look bent or crushed, either the cable plug or the filter jack may be damaged. Reseat both cables firmly. If you suspect a cable, swap it for one you know works.

Step 5

Bypass the filter to confirm everything else is working.

This step verifies the cables, your network, and your audio device are all working. If everything else passes the bypass test, the filter is the cause.

Unplug both cables from the filter and connect them together with an RJ-45 coupler (a small plastic adapter that joins two Ethernet cables end to end; available at any hardware or electronics store for a few dollars). If your audio device now reaches the network and plays music normally, the cables and your network are fine and the filter is the problem. If music still doesn't play, the issue is somewhere other than the filter.

If you don't have a coupler, run a single Ethernet cable directly from the network to your audio device, bypassing the filter entirely. Same result: if it works, the filter is the cause. If it doesn't, the issue is elsewhere.

Step 6

Contact us.

If Steps 1 through 5 indicate the filter has failed, contact us. The GigaFOIL v4 Inline cannot be repaired; we can help you with warranty service if your unit is still under its original two-year warranty, or with an upgrade to the ACTIV 10G.

Replacement Options

Upgrade to a SCIF-Grade Filter

The GigaFOIL v4 Inline is no longer made, but DJM still builds Ethernet filters for audio systems, and the current one is a serious step up. The ACTIV 10G is the same active filter DJM builds for government SCIFs, defense labs, and MRI suites, the environments with the most demanding electrical-noise requirements in the world. It uses active digital filtering to regenerate a clean network signal and strip the interference riding on the line feeding your system.

Built for the Most Demanding Environments

The ACTIV 10G is engineered to military and SCIF shielding standards, not consumer price points. For audiophiles, that means a filter with no corners cut: machined housing, active signal regeneration, and filtering performance well beyond what a consumer in-line filter targets. Audiophiles running it in their streaming setups report excellent results; one recent customer simply set the unit behind his DAC and streamer with a short Cat 8 run to the DAC and was thrilled with the sound.

Future Product Developments

DJM is always developing new filter products. If you'd like to hear from us about future developments, sign up for our email list at the bottom of this page and select "Audiophile" as your interest, and we'll keep you posted.

See the ACTIV 10G Audiophile Filtering

Common Questions

Common questions

Should I use shielded or unshielded Ethernet cable?

A.Either can work. CAT cable was originally designed to be unshielded, and unshielded cable is fine for most audiophile installations. That said, if you're hearing noise, humming, or any kind of artifact you suspect is coming through the network connection, swapping to shielded cable is worth trying. Some listeners feel shielded cable sounds better; others don't notice a difference. The most important thing is to keep the cable between the filter's output and your audio device as short as you reasonably can, and to keep that cable away from power cords, signal cables, and other potential noise sources. If you're using a cable extension on either side of the filter, match shielded with shielded and unshielded with unshielded; mixing creates a discontinuity at the transition that can let noise in.

Will the GigaFOIL v4 Inline work with CAT5e, CAT6, CAT6A, or CAT7 cable?

A.Yes, with any of those, as long as the cable is actually carrying Ethernet. The CAT rating describes the cable construction (wire gauge, twists per foot, shielding, and so on), not what's running through it. Most CAT cable in homes carries Ethernet, but the same kind of cable is sometimes used for proprietary signals (some smart home systems, some older intercoms, certain phone systems). The GigaFOIL v4 Inline passes Ethernet (TCP/IP) only. If your audio device uses something other than standard Ethernet, the filter won't help.

I've installed the filter and now my streamer can't find my music server (or the streaming service stopped working).

A.Almost always, this is the address-stuck issue described in Step 2 of the troubleshooting steps above. Reset both the filter and the streamer together: unplug the filter, turn off the streamer, wait ten seconds, plug the filter back in, then turn the streamer on. The streamer will find the network and your music server during its startup.

Where should the filter sit physically? Does it matter?

A.Place the filter as close as you reasonably can to your audio device, and use a short cable between the filter's output and the audio device. The shorter that cable is, the less chance there is for noise to find its way back onto it after the filter has cleaned the signal. The longer cable on the network side (between your router or switch and the filter's input) doesn't matter as much because the filter cleans up whatever comes in.