Hi
I got my hands on a dead Harman Kardon go+play. The logic/amp board was missing. I would like to fit it with a high-quality amplifier for as cheaply as possible.
This box has a pair of 30 watt woofers and a pair of 15 watt tweeters. All drivers are 4 ohm.
I definitely need a high pass filter on the tweeter because it distorts at frequencies below 2000. I think a 5khz cutoff would be fine. Maybe I want a crossover but I can't find anything within my budget. The woofer seems to behave fine until it cuts out naturally. The amp that I would like to use is a 2 channel 50w class D from Parts Express. I can get the amp plus a pair of 5khz high pass filters from that store for around $36 plus shipping.
My problem with using just a high pass filter is that I would need to wire the woofer and filter in parallel, which would bring the total impedance to 2 ohms. The amp's minimum impedance is 4 ohms. My question is, what happens to a class D amp when the impedance is lower than the spec permits?
Another option would be to use the same amp and an actual crossover. However that would bring my cost to $75, since the cheapest 5k crossover I can find is $25.
I could also use a 4-channel amp plus the high pass filter. I could do this for about $65.
Any thoughts? Can I safely overdraw the 50w class d amp? Is there a cheap ($10) way of building a high quality, 50watt crossover? Does anyone know of an even cheaper solution?
I am hoping to get at lead as good a sound as the original amp has.
I got my hands on a dead Harman Kardon go+play. The logic/amp board was missing. I would like to fit it with a high-quality amplifier for as cheaply as possible.
This box has a pair of 30 watt woofers and a pair of 15 watt tweeters. All drivers are 4 ohm.
I definitely need a high pass filter on the tweeter because it distorts at frequencies below 2000. I think a 5khz cutoff would be fine. Maybe I want a crossover but I can't find anything within my budget. The woofer seems to behave fine until it cuts out naturally. The amp that I would like to use is a 2 channel 50w class D from Parts Express. I can get the amp plus a pair of 5khz high pass filters from that store for around $36 plus shipping.
My problem with using just a high pass filter is that I would need to wire the woofer and filter in parallel, which would bring the total impedance to 2 ohms. The amp's minimum impedance is 4 ohms. My question is, what happens to a class D amp when the impedance is lower than the spec permits?
Another option would be to use the same amp and an actual crossover. However that would bring my cost to $75, since the cheapest 5k crossover I can find is $25.
I could also use a 4-channel amp plus the high pass filter. I could do this for about $65.
Any thoughts? Can I safely overdraw the 50w class d amp? Is there a cheap ($10) way of building a high quality, 50watt crossover? Does anyone know of an even cheaper solution?
I am hoping to get at lead as good a sound as the original amp has.