Kerry Hackney
Stunt Coordinator
- Joined
- Oct 18, 2000
- Messages
- 206
Last evening, I had a chance to sit down and take some measurements of my Dharman sub. I was curious to see how it would compare with my DIY Tempest. Below are the numbers. I took these using a tone generator program output from my laptop. The SPL meter was tripod mounted 2 meters from the sub and about 1 meter up. It was actually slightly lower than the Dharman as it is stacked on top of my DIY sub.
Frq SPL
20 Hz. - 87.50
21 Hz. - 87.92
22 Hz. - 88.38
23 Hz. - 86.88
24 Hz. - 85.42
25 Hz. - 85.00
26 Hz. - 86.62
27 Hz. - 87.27
28 Hz. - 87.95
29 Hz. - 87.65
30 Hz. - 86.38
31 Hz. - 86.62
31.5 Hz. - 86.00
32 Hz. - 85.97
33 Hz. - 85.91
34 Hz. - 85.84
35 Hz. - 85.78
36 Hz. - 85.22
37 Hz. - 85.17
38 Hz. - 85.11
39 Hz. - 85.55
40 Hz. - 85.50
41 Hz. - 84.76
42 Hz. - 84.18
43 Hz. - 84.09
44 Hz. - 83.49
45 Hz. - 82.90
46 Hz. - 82.81
47 Hz. - 81.73
48 Hz. - 81.66
49 Hz. - 81.58
50 Hz. - 81.50
51 Hz. - 81.50
52 Hz. - 81.50
53 Hz. - 81.50
54 Hz. - 81.50
55 Hz. - 81.50
56 Hz. - 81.50
57 Hz. - 81.50
58 Hz. - 81.50
59 Hz. - 81.50
60 Hz. - 81.50
61 Hz. - 81.50
62 Hz. - 81.50
63 Hz. - 81.50
63 Hz. - 80.50
64 Hz. - 80.50
65 Hz. - 80.50
66 Hz. - 80.50
67 Hz. - 80.50
68 Hz. - 80.50
69 Hz. - 80.50
70 Hz. - 80.50
71 Hz. - 80.50
72 Hz. - 80.50
73 Hz. - 80.50
74 Hz. - 80.50
75 Hz. - 80.50
76 Hz. - 80.50
77 Hz. - 80.50
78 Hz. - 80.50
79 Hz. - 79.50
80 Hz. - 78.50
These are all corrected numbers. You're probably dubious as this is pretty flat. Yes, but I have these in a room that is roughly 8000>ft3. This is very simular to the curve that my tempest generated. I also took some staggered reading at the listening position
Frq SPL
20 Hz. - 81.50
21 Hz. - 81.92
22 Hz. - 81.38
23 Hz. - 81.88
24 Hz. - 83.42
25 Hz. - 83.00
30 Hz. - 78.38
35 Hz. - 74.78
40 Hz. - 77.50
45 Hz. - 75.90
50 Hz. - 77.50
55 Hz. - 79.50
60 Hz. - 81.50
65 Hz. - 81.50
70 Hz. - 79.50
75 Hz. - 75.50
80 Hz. - 76.50
85 Hz. - 79.61
90 Hz. - 76.73
I will eventually employee a BFD to get things a little better. I am amazed at how well the Dharman holds as compared to the Tempest.
These measurements were taken at relatively low levels partly because this is closer to my listening preferences. I rarely listen to things really loud. However, I had a good friend of mine over this past Sunday who is a dedicated horn builder. We had my system cranked up and shaking the room. He was impressed enough to say my system is "not bad, not bad at all". Coming from this guy, that is extremely high praise. His rig will "ring your ears" if he wants.
I intend to do more music listening of the Dharman by itself. The way my system is configured it is very easy for me to turn on or off the individual subs as I wish. I am going to get some plugs for the ports and try a psudo-sealed version for music. I'll let you know how that goes. As it is, with both subs running they sound terrific in my opinion. The Tempest has more output capability as you would expect, but I can't say that it will be a night and day difference as far as extension. The Dharman can deffinately get to 20 in my corner with NO trouble and no roll off. I have them balanced for dual operation and find that the headroom the two of them provide makes for effortless dynamics and a blanket of bass in my listening area.
I have watched more than a few movies with the Dharman solo. The TPM intro and pod race scenes have all of the expected roomshake and dynamics that will make your guests jaws drop. The DTS demo disk is also a great test, and the Dharman passes. I have not had any signs of bottoming in my experiments so far. And yes I have cranked it up to see. My ceiling tiles, AC vents, fireplace door all rattle but the sub doesn't. I even shook shampoo bottles off the shower ledge up-stairs. If your taste dictates a "box" sub, this is absolutely one you should consider.
Frq SPL
20 Hz. - 87.50
21 Hz. - 87.92
22 Hz. - 88.38
23 Hz. - 86.88
24 Hz. - 85.42
25 Hz. - 85.00
26 Hz. - 86.62
27 Hz. - 87.27
28 Hz. - 87.95
29 Hz. - 87.65
30 Hz. - 86.38
31 Hz. - 86.62
31.5 Hz. - 86.00
32 Hz. - 85.97
33 Hz. - 85.91
34 Hz. - 85.84
35 Hz. - 85.78
36 Hz. - 85.22
37 Hz. - 85.17
38 Hz. - 85.11
39 Hz. - 85.55
40 Hz. - 85.50
41 Hz. - 84.76
42 Hz. - 84.18
43 Hz. - 84.09
44 Hz. - 83.49
45 Hz. - 82.90
46 Hz. - 82.81
47 Hz. - 81.73
48 Hz. - 81.66
49 Hz. - 81.58
50 Hz. - 81.50
51 Hz. - 81.50
52 Hz. - 81.50
53 Hz. - 81.50
54 Hz. - 81.50
55 Hz. - 81.50
56 Hz. - 81.50
57 Hz. - 81.50
58 Hz. - 81.50
59 Hz. - 81.50
60 Hz. - 81.50
61 Hz. - 81.50
62 Hz. - 81.50
63 Hz. - 81.50
63 Hz. - 80.50
64 Hz. - 80.50
65 Hz. - 80.50
66 Hz. - 80.50
67 Hz. - 80.50
68 Hz. - 80.50
69 Hz. - 80.50
70 Hz. - 80.50
71 Hz. - 80.50
72 Hz. - 80.50
73 Hz. - 80.50
74 Hz. - 80.50
75 Hz. - 80.50
76 Hz. - 80.50
77 Hz. - 80.50
78 Hz. - 80.50
79 Hz. - 79.50
80 Hz. - 78.50
These are all corrected numbers. You're probably dubious as this is pretty flat. Yes, but I have these in a room that is roughly 8000>ft3. This is very simular to the curve that my tempest generated. I also took some staggered reading at the listening position
Frq SPL
20 Hz. - 81.50
21 Hz. - 81.92
22 Hz. - 81.38
23 Hz. - 81.88
24 Hz. - 83.42
25 Hz. - 83.00
30 Hz. - 78.38
35 Hz. - 74.78
40 Hz. - 77.50
45 Hz. - 75.90
50 Hz. - 77.50
55 Hz. - 79.50
60 Hz. - 81.50
65 Hz. - 81.50
70 Hz. - 79.50
75 Hz. - 75.50
80 Hz. - 76.50
85 Hz. - 79.61
90 Hz. - 76.73
I will eventually employee a BFD to get things a little better. I am amazed at how well the Dharman holds as compared to the Tempest.
These measurements were taken at relatively low levels partly because this is closer to my listening preferences. I rarely listen to things really loud. However, I had a good friend of mine over this past Sunday who is a dedicated horn builder. We had my system cranked up and shaking the room. He was impressed enough to say my system is "not bad, not bad at all". Coming from this guy, that is extremely high praise. His rig will "ring your ears" if he wants.
I intend to do more music listening of the Dharman by itself. The way my system is configured it is very easy for me to turn on or off the individual subs as I wish. I am going to get some plugs for the ports and try a psudo-sealed version for music. I'll let you know how that goes. As it is, with both subs running they sound terrific in my opinion. The Tempest has more output capability as you would expect, but I can't say that it will be a night and day difference as far as extension. The Dharman can deffinately get to 20 in my corner with NO trouble and no roll off. I have them balanced for dual operation and find that the headroom the two of them provide makes for effortless dynamics and a blanket of bass in my listening area.
I have watched more than a few movies with the Dharman solo. The TPM intro and pod race scenes have all of the expected roomshake and dynamics that will make your guests jaws drop. The DTS demo disk is also a great test, and the Dharman passes. I have not had any signs of bottoming in my experiments so far. And yes I have cranked it up to see. My ceiling tiles, AC vents, fireplace door all rattle but the sub doesn't. I even shook shampoo bottles off the shower ledge up-stairs. If your taste dictates a "box" sub, this is absolutely one you should consider.