Hello everyone,
I need advice regarding active crossover for my little project. Currently I use small 2 way DIY little bookshelf that I really like and now I want to add a small subwoofer to extend the low of my little bookshelf. Searching in the net and seems like the most favorite type is LR 4th order, so my plan is build that but only for LPF, the output to my bookshelf I'd like to keep full range, is that OK?
I already make quick sim using TI Tina and I attached the schematic, any suggestion, critics and advice will be really appreciated.
I need advice regarding active crossover for my little project. Currently I use small 2 way DIY little bookshelf that I really like and now I want to add a small subwoofer to extend the low of my little bookshelf. Searching in the net and seems like the most favorite type is LR 4th order, so my plan is build that but only for LPF, the output to my bookshelf I'd like to keep full range, is that OK?
I already make quick sim using TI Tina and I attached the schematic, any suggestion, critics and advice will be really appreciated.
Attachments
I would highly recommend a high pass filter for your "bookshelf" speakers. Match the frequency to the sub crossover frequency.
Fourth order isn't necessary, but it's fine.
Limiting bass extension will greaty increase available SPL of your bookshelf units. I use a 20 Hz sixth order high pass filter on my entire system and it greatly increases dynamic range and lowers distortion. Very worthwhile and I should have done it decades ago! Here it is. https://sound-au.com/project99.htm
Circuit is from Rod Elliott at ESP. Elliott's circuits seem to always work for me and you can easily modify them.
Fourth order isn't necessary, but it's fine.
Limiting bass extension will greaty increase available SPL of your bookshelf units. I use a 20 Hz sixth order high pass filter on my entire system and it greatly increases dynamic range and lowers distortion. Very worthwhile and I should have done it decades ago! Here it is. https://sound-au.com/project99.htm
Circuit is from Rod Elliott at ESP. Elliott's circuits seem to always work for me and you can easily modify them.
Getting the plate amp for sub is easiest way. It comes with adjustable crossover frequency, volume and phase for ideal tuning.
Suggestion to put high pass on bookself is good one, brings much cleaner sound. No need to burden little midbass anymore. Unnecassary distortion which polutes your midrange.
No need to go fancy though, just one large cap is all it takes.
Suggestion to put high pass on bookself is good one, brings much cleaner sound. No need to burden little midbass anymore. Unnecassary distortion which polutes your midrange.
No need to go fancy though, just one large cap is all it takes.
@Fast Eddie D, Thank You for the suggestion, I will check and learn Rod Elliot's schematic
@adason, yes You're right about the plate amp, but I prefer to go the hard way, to learn more, and the schematic that I attached in the end will use pot to adjust the gain, freq and phase, the HPF I already put in the output also use as AC coupling, but the number is too low I think, concerning about the phase.
so 2 members suggest HPF, I will try to implement in my build, and wondering how about the phase between main and subwoofer, should I concern about that?
Thank You
@adason, yes You're right about the plate amp, but I prefer to go the hard way, to learn more, and the schematic that I attached in the end will use pot to adjust the gain, freq and phase, the HPF I already put in the output also use as AC coupling, but the number is too low I think, concerning about the phase.
so 2 members suggest HPF, I will try to implement in my build, and wondering how about the phase between main and subwoofer, should I concern about that?
Thank You
Phase can be a concern. It is common for sub crossovers to have a phase adjustment.
There are known guidelines for phasing crossovers by order, but when you get to mixed order crossovers it can be murky. This is where the phase control comes in.
When using an active crossover, both the subs and satellites need to be fed from the 20 Hz filter. Elliott's circuit still has phase shift above 100 Hz, which could be problematic with some active crossover systems. Feeding both sides of the crossover from the 20 Hz filter circumvents this.
There are known guidelines for phasing crossovers by order, but when you get to mixed order crossovers it can be murky. This is where the phase control comes in.
When using an active crossover, both the subs and satellites need to be fed from the 20 Hz filter. Elliott's circuit still has phase shift above 100 Hz, which could be problematic with some active crossover systems. Feeding both sides of the crossover from the 20 Hz filter circumvents this.