Best curve for Mid bass punch - Home Theater Forum and Systems - HomeTheaterShack.com

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post #1 of 20 Old 12-07-09, 09:54 AM Thread Starter
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Best curve for Mid bass punch

Hi there,

I have been playing with various curves to get deep bass and good mid bass punch but am not sure if I am going in the right direction. I have a flat curve, a hard knee house curve and a third curve which is like a house curve but with lower mid bass raised slightly.

I was wondering what kind of curve gets you punch in the chest bass. I am aware that it does depend on the sub but I think my dual 18" sealed should cover that area easily but I still feel I could do with more.

I know it is trial and error but it would be good to get an idea on what is a good starting point.

I am open to suggestions.

cheers

Graham
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post #2 of 20 Old 12-07-09, 10:33 AM
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Re: Best curve for Mid bass punch


Quote:
I was wondering what kind of curve gets you punch in the chest bass.
Pose that question on the pro audio forums and they’ll tell you ~80 Hz. Keep in mind, that “punch in the chest” thing is largely dependent on the movement of air. In a high performance PA system that’s not hard to do since they have huge subwoofers, often lots of them, so it might not be fully attainable in a home system. If high performance car audio systems are what you're used to, the same applies: They have an exceedingly large number of subs compared to the size of the listening space. Still, I’d say 80-100 Hz is a good place to start.

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Wayne
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post #3 of 20 Old 12-07-09, 10:52 AM Thread Starter
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Re: Best curve for Mid bass punch

Wayne,

Thanks for the reply. So upping my crossover to 100 or 120 is probably a good place to start as my mains are Monitor Audio RS6's. My thread is:

http://www.hometheatershack.com/foru...w-diy-sub.html

do you think based on my sub there would be any problems in getting that.

I have tonnes of low end which is not a problem.

cheers

Graham
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post #4 of 20 Old 12-07-09, 11:38 AM
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Re: Best curve for Mid bass punch

My personal experience is not to raise your crossover, Leave it at 80hz boosting the 50-80Hz area will give you the best "Punch". Raising the crossover with start giving you localisation issues with the sub.
I've done both live concert mixing and studio and the punch starts in the mid 40Hz range up to about 80Hz going higher it will start to sound muddy.

Home theater:
Onkyo 805, Yamaha YDP2006EQ, Samson Servo 600 amp
3 EV Sentry 500 monitors across the front, 4 Mission 762i's Surrounds, SVS PB13U sub, Panasonic BDT220, Harmony 1100, Nintendo WiiU
Panasonic PT-AE8000 on a 120" 2,35:1 fixed screen

Living room system:
Sherwood/Newcastle R972, Mission 765's, SVS SBS02's, A/D/S MS3u sub, Yamaha YDG2030EQ
Yamaha KX-393 Tape deck, CDC 805 CD changer, Panasonic BD60, Sony turntable PS-T20
Panasonic TC-P50ST60, HD-PVR & WDTV Live, Harmony 900

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post #5 of 20 Old 12-07-09, 01:23 PM Thread Starter
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Re: Best curve for Mid bass punch

tony,

Thanks for that mate. Here are the three curves I am running. Be good to get your opinions.

The solid line is the measurement taken after Audyssey.

cheers

Graham
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Best curve for Mid bass punch-curve-1.jpg  

Best curve for Mid bass punch-curve-2.jpg  

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post #6 of 20 Old 12-07-09, 01:28 PM
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Re: Best curve for Mid bass punch

It would be nice to boost the dip between 50 and 60Hz that will give you a very noticeable improvement. Do you have one or two subs? you may need to play with the phase on one or both of them.

Home theater:
Onkyo 805, Yamaha YDP2006EQ, Samson Servo 600 amp
3 EV Sentry 500 monitors across the front, 4 Mission 762i's Surrounds, SVS PB13U sub, Panasonic BDT220, Harmony 1100, Nintendo WiiU
Panasonic PT-AE8000 on a 120" 2,35:1 fixed screen

Living room system:
Sherwood/Newcastle R972, Mission 765's, SVS SBS02's, A/D/S MS3u sub, Yamaha YDG2030EQ
Yamaha KX-393 Tape deck, CDC 805 CD changer, Panasonic BD60, Sony turntable PS-T20
Panasonic TC-P50ST60, HD-PVR & WDTV Live, Harmony 900

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post #7 of 20 Old 12-07-09, 01:37 PM Thread Starter
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Re: Best curve for Mid bass punch

tony,

One big sub. The blue dotted lines are what I have applied to in order to smooth and get rid of the dip between 50 and 60hz.

My thread:

http://www.hometheatershack.com/foru...w-diy-sub.html


I don't have a phase on my sub as it is running through a behringer 4000 amp to my onkyo 876 via the BFD. I have two 18" FI Q18's in a 11 cu ft box (with stuffing). Very heavy, weighs 320lbs.

Let me know your thoughts.

cheers

Graham
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post #8 of 20 Old 12-07-09, 03:54 PM Thread Starter
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Re: Best curve for Mid bass punch

Right I just took some measurements from some test tones I put on to a dvdr as a data disc and have come up with some wierd findings. These are from the listening position which is about 2.5 metres away. Just the sub connected and here goes.

10hz - 67db
15hz - 78db
20hz - 82db
25hz - 78db
30hz - 79db
35hz - 82db
40hz - 87db
45hz - 93db
50hz - 99db
55hz - 102db
60hz - 99db
65hz - 99db
70hz - 102db
75hz - 92db
80hz - 85db
90hz - 79db
100hz - 78db

This was at volume -28db on the onkyo. Now for the really wierd thing my measured EQ graph in measuring flat but my readings are not. So is REW wrong as it is showing a massive peak between 45 and 75hz.
The other thing is why am I still hearing tones above 80hz. My crossover on the onkyo is set to 80hz.

cheers

Graham
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post #9 of 20 Old 12-07-09, 04:04 PM
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Re: Best curve for Mid bass punch

Did you have the mic for REW in the same spot as the SPL meter? Different spots in the room will have different peaks and dips. Even moving the mic a foot can make a difference. This is why alot of people like to use two subs in different parts of the room to smooth out the response.

Home theater:
Onkyo 805, Yamaha YDP2006EQ, Samson Servo 600 amp
3 EV Sentry 500 monitors across the front, 4 Mission 762i's Surrounds, SVS PB13U sub, Panasonic BDT220, Harmony 1100, Nintendo WiiU
Panasonic PT-AE8000 on a 120" 2,35:1 fixed screen

Living room system:
Sherwood/Newcastle R972, Mission 765's, SVS SBS02's, A/D/S MS3u sub, Yamaha YDG2030EQ
Yamaha KX-393 Tape deck, CDC 805 CD changer, Panasonic BD60, Sony turntable PS-T20
Panasonic TC-P50ST60, HD-PVR & WDTV Live, Harmony 900

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post #10 of 20 Old 12-07-09, 04:41 PM Thread Starter
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Re: Best curve for Mid bass punch

Tony,

Oops, I did it 2 feet in front. Here are the new readings:

I measured the sub at 80db using the onkyo test tones.

My flat REW curve My REW house curve

10hz - 60db 10hz - 70db
15hz - 73db 15hz - 82db
20hz - 78db 20hz - 84db
25hz - 76db 25hz - 84db
30hz - 80db 30hz - 88db
35hz - 86db 35hz - 92db
40hz - 87db 40hz - 92db
45hz - 86db 45hz - 89db
50hz - 88db 50hz - 90db
55hz - 88db 55hz - 87db
60hz - 86db 60hz - 82db
65hz - 85db 65hz - 82db
70hz - 90db 70hz - 85db
75hz - 82db 75hz - 78db
80hz - 80db 80hz - 74db
90hz - 78db 90hz - 70db

I have attached the graphs to show what I adjusted the two presets too. I can't find the measurements but they did come out like that.

Your thoughts

cheers

Graham
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