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Post by miata57 on Mar 16, 2022 16:58:16 GMT -5
Hello
I am not sure if I should be using the preamp connection that cuts off frequency from 90hz and below and dial in my 2 subs or run the Maggies full range and crossover my subs at around 60-65hz?
Thanks Howie
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Post by mountain on Mar 16, 2022 17:15:05 GMT -5
Nice problem to have. I would try both and go from there. Good listening.
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Post by leonski on Mar 17, 2022 0:03:26 GMT -5
I have Magnepan 1.6s for years now..... And before THAT? MG1 which I bough in the early 80s..... So I've got LOTS of practice... Here's what I do. I LOW CUT my main speakers about 50hz to 55hz. Magnepan says they are 'good' to under 40hz....I forget exact number. This is a 12db / octave filter IN MY PREAMP. I send a full range signal to my sub, but use ITS crossover at maybe 45hz leaving a 'gap' between main and sub. Sub crossover is 24db / octave. Why a gap? Crossovers are NOT a 'brick wall'. The effect is that as that as the sub drops off....the mains pick UP. This helps them SUM FLAT thru the 'gap'..... Which Is what I'd do if I were YOU. What is the slope of the 90hz crossover? It matters. What is the slope of the crossover in the subs? Have some good, bass-heavy MUSIC ready. The best setting will be Musical.....not 'tubby' or 'smeared'. I had my sub in the WRONG PLACE for a while and my Den was impossible to sit in with the music turned up. ONE NOTE bass.....and Loud. The den was a Helmholtz resonator. An imporovement in the crossover region MIGHT be had if you can experiment with the Magnepan DWM 'midbass' module. www.youtube.com/watch?v=2rkK5_X2iAEIt is NOT a sub, but a midbass driver which will reinforce the lower end....but not the Lowest.....frequencies.... |
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Post by Boomzilla on Mar 17, 2022 4:53:07 GMT -5
The 90 Hz. crossover in the PT1 is a symmetrical 12dB one (correct me if I'm wrong, please, KeithL). Although this shuts off the main speakers quickly enough, depending on the sub, it may not stop the sub from muddying the sound above 90 Hz. In fact, leonski's setup is just about ideal. The 12dB high-pass filter shuts the bass out of the Maggies quickly enough that his amp need not waste current trying to force the Maggies to play lower than they want to. The 24dB low-pass filter on his sub is almost a brick wall against letting the subs muddy the fast response of the Maggies. The 12 & 24dB filters are complimentary and should work well in the crossover region with no significant phase cancellation. If one didn't have the flexibility of leonski's bass management, then the Magnepan DWM would be the next best option. Postscriptum: Although you have no control over the 90Hz. crossover frequency with the PT1's crossover, you can sigificantly improve the crossover performance at no cost. Use the PT1's high-pass section to drive the satellite power amps. This rolls off your main speakers at 12dB/octave. Then use the sub out from the preamp and ALSO set your subwoofer's internal crossover (normally also a 12dB/octave one) to 90 Hz. The PT1's 12dB slope will combine with the sub's 12dB slope to provide you with an effective 24dB/octave cutoff on your sub. This will better prevent the subwoofer from muddying the sound of your main speakers. You can also "tune the blend" at the crossover point by slightly adjusting the crossover frequency on the subwoofer's plate amplifier. |
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Post by leonski on Mar 17, 2022 14:10:53 GMT -5
I hope the OP has enough info to begin experiments. And hopefully get the 'good result' we all strive for.
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Post by miata57 on Mar 17, 2022 17:53:10 GMT -5
Thanks everybody for the info!
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Post by leonski on Mar 17, 2022 21:35:09 GMT -5
Please post BACK or send a personal when you start getting results or reach a roadblock.......
Boom is always good for some reason and sometimes I am, too......
Is your pic of a Miata?
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Post by Boomzilla on Mar 18, 2022 2:18:51 GMT -5
...Boom is always good for some reason... My wife begs to differ...  Postscriptum - Maggie fan? Watch the April 22 AXPONA show closely! (and hopefully, watch for my review shortly thereafter.) |
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Post by miata57 on Mar 18, 2022 13:39:53 GMT -5
After trying out a few different setups, I decided to run my Maggies full range and crossover at about 60 hz with a 24db slope. This works well for 95% of my recording but I do have to cut back the bass on some tracks which is easy with the SVS app.
Yup, an older Miata I used to have Leonski
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Post by leonski on Mar 18, 2022 16:10:39 GMT -5
Miata might be about the most FUN possible on 4 wheels. Affordable? Same size wheel / tire all around? Reasonable power, but not 'nuts'?
Very reliable and generally 'fixable'........
what's not to like? I'd have to check out latest Insurance rates, but that's an unfortunate detail!
Test slightly HIGHER crossover while low-cutting the mains. This might provide a good compromise so you do NOT have to cut bass on any tracks.
Don't forget that ALL recordings are not the same thruout.
Glad you had some good results with your testing...
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