Knoll Systems service information
The 4K and 6K amplifiers do not contain any user serviceable parts inside. If you suspect a problem that may require servicing, contact us at www.knollsystems.com/contact.html, or by phone at 800
Troubleshooting: If a problem is encountered with the 4K or 6K, the most expedient procedure is to locate the problem and if possible repair it before requesting service. Be sure to carefully check other system components such as controllers, CD players, volume controls, wiring, speakers, etc. that may be at fault.
Problem | Action | |
Power LED does | 1. | Check that the amp is plugged in. |
not light - no sound | 2. | Test the AC outlet with a lamp. |
| 3. | If remote on/off is used, check that |
|
| the trigger voltage is at 12 VDC. |
| 4. | Check 4K or 6K power button is on (in). |
Sound cuts out | 1. Verify speaker impedance is | |
|
| Changing speakers may be required. |
| 2. | Check if the amp feels hot. If it's |
|
| hot increase cooling - see Installation. |
Sound is distorted | 1. | Turn the volume down. |
| 2. | Check speakers for damage. |
| 3. | Check inputs for proper levels. |
|
| 4K or 6K gain and source output level |
|
| may have to be adjusted. |
| 4. | Speakers may be less than 4 ohms. |
MA1250 does | 1. | Push 4K or 6K power switch off (out) |
not turn off | 2. | If trigger is being used, power switch |
|
| needs to be set to off (out) position |
|
| or amp is on all the time. |
| 3. | Try disconnecting trigger jack. |
Trigger does not | 1. | Measure trigger voltage with a volt |
work |
| meter. It needs to be |
|
| to work (current is about 35mA total |
|
| per amp). See page 5 for details. |
Speaker pops when | 1. | Speaker may need resistor placed |
amp turned on or off |
| across terminal. Suggest 2k0 1/4 w. |
|
| Discharges speaker internal cap. |
Installation
Installing the 4K or 6K should be relatively easy. With a bit of planning, the 4K or 6K will give trouble free service for years.
1.The most important consideration when installing the 4K or 6K is cooling. The 4K or 6K has a lot of power packed into a small chassis size. When installing it in an equipment stack, it should be the top component. It needs at least
2.Amplifiers should always be the top components in system.
3.If 4K or 6K channels frequently shutdown due to overheating, install a fan directed up from the amplifier bottom center.
4.Never operate the amplifier on its side, as the cooling potential drops significantly when operated on the side.
5.Connect the 4K or 6K inputs to the source component outputs with good quality, short as possible RCA jack cables. Connect each channel individually.
6.Connect the 4K or 6K speaker outputs to speakers using good quality speaker wire. Minimum 16 gauge copper wire is recommended with 14 gauge minimum for runs over 30' (10m).
Note: Ideally the 4K or 6K likes
7.Individually adjust the channel gains as required. Ideally, all gains are fully on (fully clockwise).
8.Make sure the speakers in each room are connected in phase with the amplifier + going to the speaker + . Out of phase speakers give unstable imaging and poor bass response.
9.Connect trigger if being used to a 12 VDC source (about 35mA) using a 3.5mm mono jack. 5 VDC triggers will not work.