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      09-24-2020, 01:51 PM   #1
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Mono amp for sub versus cross over three channel amp

I'm researching a configuration for my F30 with HK stereo. Many of you have just installed a mono amp with a sub and have been very happy with the outcome. I'm trying decide whether to just add a sub using that method or purchasing a three channel amp so that I can crossover the two underseat subs at a higher frequency and allow the sub to fill all of the lower frequencies.

Conventional wisdom might suggested that going the second route may yield better results, but I don't want to go this route if the results are not significant.

Has anyone done both and compared the results? I know everything is subjective, but I'd like some that has actually heard both for your opinion.

Thanks!
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      09-24-2020, 02:02 PM   #2
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If you're running the stock under seat woofers and adding a trunk sub you'll get a better overall result separately amplifying them, crossing over from the under seat woofers to the trunk sub around 60Hz. You don't need a three channel amp for that, as the signal to the under seat woofers is mono, but you may if you wish.
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      09-24-2020, 04:54 PM   #3
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A JL Audio XD500/3v2 with sub and OEM woofers is a significant improvement in bass and midbass.

Quote:
Originally Posted by sp330i View Post
I'm researching a configuration for my F30 with HK stereo. Many of you have just installed a mono amp with a sub and have been very happy with the outcome. I'm trying decide whether to just add a sub using that method or purchasing a three channel amp so that I can crossover the two underseat subs at a higher frequency and allow the sub to fill all of the lower frequencies.

Conventional wisdom might suggested that going the second route may yield better results, but I don't want to go this route if the results are not significant.

Has anyone done both and compared the results? I know everything is subjective, but I'd like some that has actually heard both for your opinion.

Thanks!
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      09-24-2020, 04:55 PM   #4
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Quote:
Originally Posted by Billfitz View Post
If you're running the stock under seat woofers and adding a trunk sub you'll get a better overall result separately amplifying them, crossing over from the under seat woofers to the trunk sub around 60Hz. You don't need a three channel amp for that, as the signal to the under seat woofers is mono, but you may if you wish.
Underseat woofers signal is stereo.
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      09-24-2020, 10:00 PM   #5
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Quote:
Originally Posted by sp330i View Post
I'm researching a configuration for my F30 with HK stereo. Many of you have just installed a mono amp with a sub and have been very happy with the outcome. I'm trying decide whether to just add a sub using that method or purchasing a three channel amp so that I can crossover the two underseat subs at a higher frequency and allow the sub to fill all of the lower frequencies.

Conventional wisdom might suggested that going the second route may yield better results, but I don't want to go this route if the results are not significant.

Has anyone done both and compared the results? I know everything is subjective, but I'd like some that has actually heard both for your opinion.

Thanks!
If your amp have build in DSP, the second option would be better. You can go for AudioControl D.4.800. Use Channel 1 & 2 for underseat sub, and bridge Channel 3 & 4 for Mono Sub. Also note that you need to use DSP to increase the frequency below 40hz as HK amp have build in HPF around that freq.
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