based on these test results with a dmm, where to set my HU volume

[frankiebones 10+ year member]

i did the test using a 0dB and a -3dB 50Hz test tone and then plotted the Log of the first minus the log of the second. i did this all without processing. i got nothing but a smooth curve without any indication of where clipping occurs.

can i do the same test with the processing on?

also, if the HU is capable of producing 5V preamp output, can i just determine, using a test tone, when the voltage reaches a level greater than 5V and assume thats where it clips?

both are at 50Hz, the 3 columns are 1. volume, 2. voltage @ 0dB, 3. voltage@ -3dB

VOLUME/VOLTAGE @ 0 DB/ VOLTAGE @ -3DB

1 0.005 0.005 V.

2 0.005 0.005

3 0.005 0.005

4 0.005 0.005

5 0.006 0.006

6 0.006 0.006

7 0.006 0.006

8 0.008 0.006

9 0.009 0.007

10 0.01 0.008

11 0.012 0.009

12 0.013 0.010

13 0.015 0.011

14 0.017 0.012

15 0.018 0.013

16 0.021 0.015

17 0.023 0.017

18 0.026 0.018

19 0.029 0.021

20 0.031 0.023

21 0.035 0.025

22 0.039 0.029

23 0.044 0.031

24 0.049 0.035

25 0.054 0.039

26 0.06 0.043

27 0.067 0.049

28 0.075 0.054

29 0.084 0.060

30 0.094 0.067

31 0.105 0.075

32 0.117 0.084

33 0.131 0.094

34 0.148 0.105

35 0.166 0.117

36 0.186 0.132

37 0.208 0.148

38 0.233 0.165

39 0.262 0.186

40 0.293 0.208

41 0.328 0.233

42 0.368 0.261

43 0.413 0.293

44 0.463 0.328

45 0.519 0.368

46 0.583 0.412

47 0.653 0.463

48 0.732 0.519

49 0.822 0.582

50 0.922 0.653

51 1.034 0.732

52 1.16 0.821

53 1.3 0.920

54 1.46 1.033

55 1.64 1.159

56 1.84 1.301

57 2.06 1.459

58 2.31 1.635

59 2.59 1.832

60 2.9 2.06

61 3.65 2.58

MAX 4.58 3.25

Click to read more...

 

[frankiebones 10+ year member]

here is a graph

 

[BassAddictJ 5,000+ posts]

bump

somebody wanna help this guys with thier opinions?

 

[DBfan187 5,000+ posts]

most of the Pioneers I've put under the oscope clips @ volume 61/62(0dB 1kH) with all processing turned off.

 

[nauc 10+ year member]

is that the sub out or the front outs

id use 50hz for subs, 1k for fronts, if you didnt already

dont know if it will make much or any difference...

 

[DBfan187 5,000+ posts]

I did 40Hz on the sub out.

 

[thch 10+ year member]

ratios give:

10 1.25 (should be 1.414. this one is probably measurement error)

20 1.347

30 1.402

40 1.408 (measurement accuracy appears to be improving)

50 1.411

60 1.407 (the 2.9 has insufficient accuracy)

61 1.414 (excellent)

62 1.409 (not bad)

i'd say any of these would be fine. if there were moderately clipping, you'd expect to see lower numbers on the high settings. Keep in mind that with only 2-3 significant digits, the accuracy will be affected. i'd say 61 is good, and 62 is acceptable.

if you want to see a graph that shows clipping results, you can do the same thing with the compression setting (turn on compression, and use two tones) try settings 30, 40, 50, and 60. this tests compression, which is "soft clipping".

crank a bass EQ up to +18dB to see hard clipping. the results _should_ show that 30 is close to 1.4, while 40 is lower, 50 is lower still, and 60 is close to 1.0

 

[thch 10+ year member]

oh, and it looks like these are 1dB increments. the result for setting 50 are 10x (20dB) of the setting for 30. likewise the result for 60 is 10x the result for 40. and so on.