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Author Topic: CA 9100 Pre-amp  (Read 10461 times)

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Offline taperjeff

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CA 9100 Pre-amp
« on: October 04, 2012, 02:46:48 PM »
Jut curious, I open my CA 9100 Prea-mp to peak inside.  Purchased the unit a year ago used and the previous owner doesn't know what it means.My unit has a switch inside set to off.  There is some other writing HPF and V44.  My hunch is that this unit may have been used with a R44.  Would I want to switch "on" for any reason? ???

« Last Edit: October 08, 2012, 12:03:16 AM by taperjeff »

Marshall7

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Re: CA 9100 Ugly Box
« Reply #1 on: October 04, 2012, 03:53:41 PM »
HPF = high pass filter
V44 = version 4.4


Offline taperjeff

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Re: CA 9100 Ugly Box
« Reply #2 on: October 04, 2012, 04:07:11 PM »
thank you for clarifying.   ;D

Offline F.O.Bean

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Re: CA 9100 Ugly Box
« Reply #3 on: October 04, 2012, 04:10:34 PM »
Makes sense now :P ;D
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Marshall7

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Re: CA 9100 Ugly Box
« Reply #4 on: October 05, 2012, 03:39:38 PM »
thank you for clarifying.   ;D

Of course that still leaves the question - do you ever want to turn it on or not? ;D

adrianf74

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Re: CA 9100 Ugly Box
« Reply #5 on: October 06, 2012, 06:04:35 PM »
More importantly, the 9100 is not an "ugly box" but a "9100 Preamp."   The Ugly Preamp doesn't have a HPF nor can be (easily) disassembled.   Just sayin'.  ;)

Offline taperjeff

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Re: CA 9100 Pre-amp
« Reply #6 on: October 08, 2012, 12:08:07 AM »
you are correct adrianf, it is the preamp that I opened. 

To answer the question Marshall7, I would leave it turned off.  I can run a high pass filter in post production and can leave the screw driver at home.

Offline F.O.Bean

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Re: CA 9100 Pre-amp
« Reply #7 on: October 08, 2012, 12:22:21 PM »
you are correct adrianf, it is the preamp that I opened. 

To answer the question Marshall7, I would leave it turned off.  I can run a high pass filter in post production and can leave the screw driver at home.

Thats how I ran it too :)
Schoeps MK 4V & MK 41V ->
Schoeps 250|0 KCY's (x2) ->
Naiant +60v|Low Noise PFA's (x2) ->
DarkTrain Right Angle Stubby XLR's (x3) ->
Sound Devices MixPre-6 & MixPre-3

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Offline whiskybob

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Re: CA 9100 Pre-amp
« Reply #8 on: October 15, 2012, 07:25:34 AM »
I'm so pleased I stumbled across this thread today.
I'm planning on running my CA11's through the box and wondered that the settings were, I'm assuming that the HPF is bass roll off? I've used the box before and the results were horrible, one minute the recording was fine then the next it went tinny.

If someone could just confirm my suspicions

David
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Offline Craig T

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Re: CA 9100 Pre-amp
« Reply #9 on: October 15, 2012, 01:49:35 PM »
I've used the box before and the results were horrible, one minute the recording was fine then the next it went tinny.

If someone could just confirm my suspicions

David

I suspect the output cable became partially unseated from the recorder or preamp (more likely at the recorder).  It is doubtful the HPF switch moved during recording.  Did it also go from stereo to mono when it went from "fine" to "tinny"?
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Offline whiskybob

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Re: CA 9100 Pre-amp
« Reply #10 on: October 16, 2012, 12:28:46 PM »
No, I assumed the HPF was set to off so I was recording with bass roll off, I'm assuming that was kicking in which caused the issue?
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Offline Church-Audio

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Re: CA 9100 Pre-amp
« Reply #11 on: October 16, 2012, 01:42:06 PM »
I'm so pleased I stumbled across this thread today.
I'm planning on running my CA11's through the box and wondered that the settings were, I'm assuming that the HPF is bass roll off? I've used the box before and the results were horrible, one minute the recording was fine then the next it went tinny.

If someone could just confirm my suspicions

David
Sounds like a bad connection somewhere or a bad battery.

Chris
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Offline F.O.Bean

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Re: CA 9100 Pre-amp
« Reply #12 on: December 10, 2012, 12:22:57 AM »
I'm running battery tests with a single energizer max 9volt, and I'm at 75 hrs right now, recording the tv. Levels are still high and not weakening at all. If I can get 80-95 hours I will be amazed ;) :)
Schoeps MK 4V & MK 41V ->
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DarkTrain Right Angle Stubby XLR's (x3) ->
Sound Devices MixPre-6 & MixPre-3

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Marshall7

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Re: CA 9100 Pre-amp
« Reply #13 on: December 10, 2012, 03:58:39 PM »
No, I assumed the HPF was set to off so I was recording with bass roll off, I'm assuming that was kicking in which caused the issue?

Seems unlikley a "high pass filter" and a "bass roll off" are the same thing. :)

Offline F.O.Bean

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Re: CA 9100 Pre-amp
« Reply #14 on: December 10, 2012, 06:01:18 PM »
No, I assumed the HPF was set to off so I was recording with bass roll off, I'm assuming that was kicking in which caused the issue?

Seems unlikley a "high pass filter" and a "bass roll off" are the same thing. :)

HPF and Bass Roll Off are 100% the same thing
Schoeps MK 4V & MK 41V ->
Schoeps 250|0 KCY's (x2) ->
Naiant +60v|Low Noise PFA's (x2) ->
DarkTrain Right Angle Stubby XLR's (x3) ->
Sound Devices MixPre-6 & MixPre-3

http://www.archive.org/bookmarks/diskobean
http://www.archive.org/bookmarks/Bean420
http://bt.etree.org/mytorrents.php
http://www.mediafire.com/folder/j9eu80jpuaubz/Recordings

Offline F.O.Bean

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Re: CA 9100 Pre-amp
« Reply #15 on: December 10, 2012, 11:02:39 PM »
I got 75 hours with my 9100 w just a regular energizer alkaline battery
Schoeps MK 4V & MK 41V ->
Schoeps 250|0 KCY's (x2) ->
Naiant +60v|Low Noise PFA's (x2) ->
DarkTrain Right Angle Stubby XLR's (x3) ->
Sound Devices MixPre-6 & MixPre-3

http://www.archive.org/bookmarks/diskobean
http://www.archive.org/bookmarks/Bean420
http://bt.etree.org/mytorrents.php
http://www.mediafire.com/folder/j9eu80jpuaubz/Recordings

Marshall7

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Re: CA 9100 Pre-amp
« Reply #16 on: December 11, 2012, 03:41:00 PM »
No, I assumed the HPF was set to off so I was recording with bass roll off, I'm assuming that was kicking in which caused the issue?

Seems unlikley a "high pass filter" and a "bass roll off" are the same thing. :)

HPF and Bass Roll Off are 100% the same thing

Why isn't it caleld a low pass filter then? ::)

Offline Church-Audio

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Re: CA 9100 Pre-amp
« Reply #17 on: December 11, 2012, 04:03:56 PM »
No, I assumed the HPF was set to off so I was recording with bass roll off, I'm assuming that was kicking in which caused the issue?

Seems unlikley a "high pass filter" and a "bass roll off" are the same thing. :)

HPF and Bass Roll Off are 100% the same thing

Why isn't it caleld a low pass filter then? ::)
Low pass filter allows lows to pass but not highs. High pass filter allows highs to pass but not lows.

Chris
for warranty returns email me at
EMAIL Sales@church-audio.com

Marshall7

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Re: CA 9100 Pre-amp
« Reply #18 on: December 12, 2012, 03:43:26 PM »
Thanks for the explanation, Chris

Offline F.O.Bean

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Re: CA 9100 Pre-amp
« Reply #19 on: December 12, 2012, 11:18:51 PM »
I got 75 hours with my 9100 w just a regular energizer alkaline battery

Gain on the 9100 was set between 10-11o'clock :)
Schoeps MK 4V & MK 41V ->
Schoeps 250|0 KCY's (x2) ->
Naiant +60v|Low Noise PFA's (x2) ->
DarkTrain Right Angle Stubby XLR's (x3) ->
Sound Devices MixPre-6 & MixPre-3

http://www.archive.org/bookmarks/diskobean
http://www.archive.org/bookmarks/Bean420
http://bt.etree.org/mytorrents.php
http://www.mediafire.com/folder/j9eu80jpuaubz/Recordings

Offline fmaderjr

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Re: CA 9100 Pre-amp
« Reply #20 on: December 13, 2012, 12:58:57 PM »
I got 75 hours with my 9100 w just a regular energizer alkaline battery

Gain on the 9100 was set between 10-11o'clock :)


11:00 is approximate unity gain setting on the CA-9100. You're not amplifying at the setting you used.

75 hours is way more than Chris says you should get. Perhaps the battery would not last as long if the CA-9100 was providing a good bit of amplification? I think Chris said a good battery would last for 30 hours or so (or maybe it was 40 hours).

Personally, I prefer to use a 9.6 volt rechargeable so I don't need to worry about when to replace the battery.
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