Little question provide big help

[96civ 10+ year member]

I'm planning on building some bookshelf speakers anytime soon, I just need to get a few kinks out of the planning -- hence these questions. I've decided to go with a low-budget set (Dayton 2-Way Bookshelf Project on PE.com). I'm going to be using a Yamaha HTR-6030 receiver (100w x 5 @ 8ohms) to power them, so nothing really special but better than the stock speakers on the Sharp LCD.

One problem I'm facing is that the receiver is stable at approximately 8 ohms, but one bookshelf speaker nets an impedance of 4 ohms. Can I add a resistor in series to the crossover in order to result in 8 ohms?

Another problem I'm facing is that the crossover design posted on the project confuses me.

In the legend box, what does it mean C2= 5.6uF 250v + .47uF 400v? Is he trying to imply that you put two caps at that location on the design?

That's all I can think of for now. Thanks

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[BrianChia 10+ year member]

Don't even bother with the impedance difference. Most modern solid state amps can handle a 4ohm load with no problem at normal listening levels, especially a reliable brand like Yamaha. You just don't want it turned up all the way for long periods of time. I use 4ohm speakers on an 8ohm receiver all the time with no problems. Of course if it starts shutting itself down or gets really hot, then you can consider adding the resistor.

As far as the crossover schematic, I'm pretty sure that just means that he has wired two different capacitors in parallel (5.6uF + 0.47uF) to yield a 6.07uF unit. 250V/400V is just the voltage rating of the capacitors used.

 

[Fast1one 10+ year member]

You should be fine as stated above, nice choice of project //content.invisioncic.com/y282845/emoticons/cool.gif.3bcaf8f141236c00f8044d07150e34f7.gif

 

[96civ 10+ year member]

As far as the crossover schematic, I'm pretty sure that just means that he has wired two different capacitors in parallel (5.6uF + 0.47uF) to yield a 6.07uF unit. 250V/400V is just the voltage rating of the capacitors used.

Since the leads to the capacitors are not polarized I just attach both leads of the two caps together on both ends, where one end is directed toward the + input and the other towards the tweeter end of the schematic? I hope that makes sense, if not I can post a sketch.

 

[Fast1one 10+ year member]

Since the leads to the capacitors are not polarized I just attach both leads of the two caps together on both ends, where one end is directed toward the + input and the other towards the tweeter end of the schematic? I hope that makes sense, if not I can post a sketch.

Yes that is correct...