Although making things a bit larger physically, fans enclosed into the
equipment case, thus providing some acoustic dampening, and configured
to pull air into the case {along with much of the noise} and exhausting
air and noise through several ports is more applicable to reducing
overall noise. High volume air moved at slow rates is much quieter than
the same amount of high volume air moved at faster rates. Also, fans
with a lower blade tip velocity makes less noise.
As I indicated in an earlier post, some fans are more efficient at
"blowing" i.e pressurizing the enclosure, while others are more
efficient at "sucking" thus evacuating the enclosure. In general, sound
moves with the air flow.
73
Bob, K4TAX
On 5/28/2018 10:10 AM, Drew AF2Z wrote:
No KPA1500 here but I did replace the fans on my lil' ol KPA3 with
Noctuas. They are noticeably quieter. If there is a suitable Noctua
replacement for the KPA1500 fans you might want to compare the sound
level specs to the Sanyo Denkis.
Wonder if it would be possible to build an active noise cancelling
system into the rig itself; seems like it would work in that enclosed
space...
73,
Drew
AF2Z
On 05/28/18 10:20, Richard Zalewski wrote:
First major contest with KPA-1500. Overall VERY pleased. No glitches
other than a few operator errors early in the contest. Loving the amp.
Fan noise...another issue. Usually for a cw contest I use some old ear
buds. Not possible with the amp. Had to use the total ear muffs and
still
quite noisy. Did not effect my performance but it is annoying. I can
not
imagine what it was like before they released the amp to general public
when they changed the fans...made them less noisy??? Still needs
some work
but at this point probably not possible. So looking for suggestions for
reasonably priced noise cancelling headset with mic if possible.
Hope we get full explanation of what gets changed in the next firmware
release.
Still smiling.
Richard
*W7ZR* ex:5C5Z, CN2ZR, K2JSP, W6SBZ, W7KXR, K9ZIJ, W9KNF, W0KDF, W0MQU,
J68ZR, KC6ZR, PJ4/W7ZR, KH2,W7ZR, KH6/W7ZR, V31ZR, VK4AAZ, XE2DV
*Be joyful in hope, patient in affliction, faithful in prayer*
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