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Budget active 3 way crossover - buy, eval, mod
Budget active 3 way crossover - buy, eval, mod
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Old 29th June 2018, 01:12 PM   #31
DonVK is offline DonVK  Canada
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That's correct, this XO is fixed gain, but there are a few other places you could adjust the channel gains. It depends on your system and what's more convenient for you. My master volume control is in the DAC, and I'm using Sure class D amps with "fixed" (preset) gain that is set via dip switch (MF, HF) or a pot (LF).

1) select the amp fixed gain (some Sure class D amps have [25.6, 31.6, 35.1, 37.6 dB] settings
2) use amp variable gain (some Sure amps have a volume control/attenuate board) adjust for the diffs and leave it
3) use amp gain offsets, often in HT amps if you are repurposing one, it allows a delta adjustment per channel
4) put an L-pad on the tweeter
5) EQ the channel gain differences at the signal source (using EQ-APO, or FIR filters), you may end up needing this due to unruly drivers, user FR curve preferences, enclosure or room behaviours.

Sure Electronics AA-AB33184 4x100W TDA7498 Class-D Amplifier Board
AA-AA11117 Digital Volume Control Kit
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Old 29th June 2018, 02:34 PM   #32
keilau is offline keilau  United States
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Location: Windy City, US
Quote:
Originally Posted by DonVK View Post
That's correct, this XO is fixed gain, but there are a few other places you could adjust the channel gains. It depends on your system and what's more convenient for you. My master volume control is in the DAC, and I'm using Sure class D amps with "fixed" (preset) gain that is set via dip switch (MF, HF) or a pot (LF).

1) select the amp fixed gain (some Sure class D amps have [25.6, 31.6, 35.1, 37.6 dB] settings
2) use amp variable gain (some Sure amps have a volume control/attenuate board) adjust for the diffs and leave it
3) use amp gain offsets, often in HT amps if you are repurposing one, it allows a delta adjustment per channel
4) put an L-pad on the tweeter
5) EQ the channel gain differences at the signal source (using EQ-APO, or FIR filters), you may end up needing this due to unruly drivers, user FR curve preferences, enclosure or room behaviours.

Sure Electronics AA-AB33184 4x100W TDA7498 Class-D Amplifier Board
AA-AA11117 Digital Volume Control Kit
I have 3 old fashion linear power amplifiers (6 channels). They have no input volume control. The 2-way board I purchased does have LP, HP and master volume control. I will wait a few more days to see if the seller will provide more information.

Another option is this fully assembled crossover box. The seller promises customized crossover frequency.
2 Ways 24dB/Oct Linkwitz-Riley Active Crossover Electrical Frequency Divider | eBay

Last edited by keilau; 29th June 2018 at 02:38 PM.
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Old 29th June 2018, 02:55 PM   #33
DonVK is offline DonVK  Canada
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Usually, boards like the one you ordered have master volume and tone controls. There is not enough info to tell what the extra controls are actually doing.

It's very easy to add a simple 2 resistor signal attenuator (fixed gain) to the HF output of your XO before the amps. Or you could add a pot between the XO and amp input if you wanted it variable attenuation.
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Old 29th June 2018, 03:34 PM   #34
keilau is offline keilau  United States
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Quote:
Originally Posted by DonVK View Post
Usually, boards like the one you ordered have master volume and tone controls. There is not enough info to tell what the extra controls are actually doing.

It's very easy to add a simple 2 resistor signal attenuator (fixed gain) to the HF output of your XO before the amps. Or you could add a pot between the XO and amp input if you wanted it variable attenuation.
The 3 dual ganged potentiometers are marked bass, treble and master on the circuit board. It is possible that they are volume and tone control. No way to tell until the seller send a schematic. The 2 sided board is hard to trace without removing the components.
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