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question for arnyk

post #1 of 4
Thread Starter 
Trying to repost -- not showing up correctly... 
 
Hey arnyk, I've been trying to understand how you arrived at the numbers/conclusions below. I've had a real hard time finding any good, concise info online concerning speaker power handling at a given frequency and the dynamic range of speakers. Perhaps you could explain/expound on the below post. Thank you. 
 
 
originally posted by arnyk:

The Focus 160 is a fairly tiny mini-monitor:

86 dB/W sensitivity (moderately low efficiency)
7.9 x 13.8 x 11.6 inch (fits on even modest bookshelves)
17 cm LF driver (6.5 inch)

My dynamic range estimator gives the following results:

Freq,Hz Max SPL, DB

10 69
20 81
30 88
40 93
50 97
60 100
70 103
80 105
90 107
100 109
130 114

These speakers are capable of producing a moderately loud output (100 dB) only down to 60 Hz.
Below 70 Hz, even a 50 wpc power amp could possibly overdrive them.
If you wanted to use them with a 100 wpc (typical AVR) WPC amplifier you would have to cross them over around 80 Hz to protect them from excessive power and audible distortion.

In all seriousness, unless these are only for night time use, or use in a tiny apartment or dormitory with thin walls, they would need a subwoofer to be able to cover even just the narrowest possible view of the musical frequency spectrum (down to 43 Hz) at fairly tame sound levels (100 dB SPL).
 
 

Edited by planetpaul - 12/6/13 at 5:47am
post #2 of 4
 
Quote:
Originally Posted by Planetpaul 
Hey arnyk, I've been trying to understand how you arrived at the numbers/conclusions below. I've had a real hard time finding any good, concise info online concerning speaker power handling at a given frequency and the dynamic range of speakers. Perhaps you could explain/expound on the below post. Thank you. 
 
 
Quote:
Originally Posted by Arnyk 


The Focus 160 is a fairly tiny mini-monitor:


86 dB/W sensitivity (moderately low efficiency)


17 cm LF driver (6.5 inch)


My dynamic range estimator gives the following results:


Freq,Hz Max SPL, DB


10 69
20 81
30 88
40 93
50 97
60 100
70 103
80 105
90 107
100 109
130 114


These speakers are capable of producing a moderately loud output (100 dB) only down to 60 Hz.

Below 70 Hz, even a 50 wpc amplifier could possibly overdrive them.

If you wanted to use them with a 100 wpc (typical AVR) WPC amplifier you would have to cross them over around 80 Hz to protect them from excessive power and audible distortion.


In all seriousness, unless these are only for night time use, or use in a tiny apartment or dormitory with thin walls, they would need a subwoofer to be able to cover even just the narrowest possible view of the musical frequency spectrum (down to 43 Hz) at fairly tame sound levels (100 dB SPL).

XLS spread sheet:

speakerdrivermaxspl.xls 21k .xls file
post #3 of 4
Thread Starter 

Thank you. Now I get it. Saved me hours of wading through the unrelated and misinformed.

 

IMO, taking the time to understand this spreadsheet and it's implications before buying gear would prevent many surprises and much dissatisfaction. 

 

Flat to 42 HZ doesn't mean squat. 110 db at 42 HZ, now we're talking,

post #4 of 4
Quote:
Originally Posted by planetpaul View Post

Thank you. Now I get it. Saved me hours of wading through the unrelated and misinformed.

IMO, taking the time to understand this spreadsheet and it's implications before buying gear would prevent many surprises and much dissatisfaction. 

Flat to 42 HZ doesn't mean squat. 110 db at 42 HZ, now we're talking,

Precisely. I love when a plan comes together! ;-)
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