Best EQ settings for Heil Proset hc-4

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Hello all,

New 6500 owner here.  I'm trying to setup my old Heil ProSet 4 (HC-4 element) and was wondering if anyone using one could post their EQ settings.  I saw that someone had asked this question before but it never got any responses.

If it matters, I normally only use this mic for contesting.  Thanks in advance.
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vin mar

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Posted 3 years ago

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Tim - W4TME, Customer Experience Manager

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There is no right answer to this question.  

EQ settings are based on the sonic characteristics of your particular voice and the microphone used.  The EQ setting for one person will not be optimal for anyone else.

There is only one way to set an EQ and that is to use one of the transmit profiles as a starting point, using the recommendations found in the HelpDesk article Rules for EQing Voice for Optimal Phone Operation, making small changes to the EQ and listening to yourself while transmitting (preferably in a 2nd receiver with a wide filter or by using the monitor technique using the record and playback feature described in the SmartSDR Software User's Guide).  Or better yet, setup a QSO with another FLEX owner and have them record you off the air and play it back so you can hear yourself.
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Vincent Martin - N5ATM

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Still looking for a starting point for my HC-4 element.  I understand what Tim is saying and obviously I would tweek the settings per my voice, but I still hoping someone has this same headset and can give me their settings as a starting point.  Thanks.
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Dave Dave

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Neutral is your starting point.
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Tim - W4TME, Customer Experience Manager

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Agreed.  But with the HC-4 element, you are at a disadvantage due to it's frequency response curve characteristics.  The Heil HC-4 element has a frequency response that rolls off very sharply below 500 Hz and has a strong pre-emphasis from 2k to 4k.  This element was designed for legacy radios with no or insufficient EQ capabilities in order to provide communication quality audio.  To make it sound any differently, will require aggressive EQing.  And without any frequency response below 500 Hz (no low-frequency spectral content) it will never have a full bodied sound.

Since our radios have a robust EQ and several other excellent signal processing features, if you want audio that is has a lot of punch, it is best to use a mic that has a wide frequency response range and EQ it for communication quality audio (contesting/DX) by cutting the lows and boosting the highs.  The biggest mistake people make with an EQ is they believe they can add spectral content where none was originally available in the source material.  Meaning, you can't add lows below 500 Hz to an HC-4 element when none existed in the first place.

There are very good mics to be had that will not break the bank.  If you have a 6500 or 6700 with the balanced mic input or a 6300 using the Heil CC-1 XLR-Y-BAL adapter cable, any dynamic sound reinforcement vocal mic will work.  The "workhorse" Shure SM58 that can be had for ~$100 can't be beat.  You will just need to have an external hand or foot PTT or use VOX to key the radio.
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Crystal clear reply to this question.

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David Warnberg

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Vin, using the same mic with my 6500.. (Heil Pro Set Elite HC6) start off with MIC profile "Default Proset HC6" then adjust from there.  I found that you will have to add 2k, 4k and 8k and either leave the others or cut them on the EQ.  Also next time you go out and rag chew or have a QSO turn on MON and listen to yourself....

Good luck


Sorry... just realized your using the HC4, not sure this will apply
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Vincent Martin - N5ATM

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David, I tried the settings for the HC6 as a start point.  No go there.  Once again, just hoping some one else has an HC4.  I only use it for contesting, which isn't often.  Don't really want to buy another headset, but maybe will need to.

Tim, I have a PR781 and rack of audio gear in-line with the Flex for normal rag chewing.  I was just looking for settings for this headset for contesting purposes.  Thanks.
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Ken - NM9P, Elmer

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If you have a good set of speakers or headphones, you can set your receiver to a bandwidth wider than your transmit bandwidth and turn OFF your RX EQ (so you will not color your recovered audio) then hit the "red button" and record your transmit audio for a little while (into a dummy load, or with TX set to an empty or terminated XVTR port so you will not be sending over the air.  Then play it back (Green Arrow) and listen to yourself  (I suggest using MED or SLOW AGC on receiver for these tests).  

Make a small change in one of the TX EQ sliders (a couple of notches at a time) and record-listen again.....

Alternately, you can use the technique I described in my youtube posts (search under NM9P) using the Full Duplex function to listen to yourself in your second slice whiole transmitting into the XVTR port.  If you can train your brain to tolerate the time delay while transmitting and listening to yourself with headphones, you can tinker all day with your HI/LO cut, Processor, TX EQ settings until you either get it the way you want or go crazy trying!  If the delay is a problem, you can port your second slice receiver via DAX over to Audacity and record yourself at length while making changes and play it back multiple times until you are sure how you want to sound.  Be sure to comment on the recording what your settings are so you can remember them!

As Tim has said, any of the default profiles profiles are merely "starting places" and you will need spend some quality time with your mic and rig to get it to match your particular voice and purpose beyond that.  

Also...I recommend zooming in to your SSB display so you can monitor your signal visually.  I like to have the "Display" parameters set to about:  AVG=50, FPS=15, Weighted Average ON when doing this.  I usually zoom so that I see either three or 6 boxes wide on my panadapter for the TX bandwidth.  This allows me to guesstimate the frequencies of particular "peaks and holes" in my transmit audio so I can adjust them down or up with the TX EQ.  IF you spend enough quality time with your rig doing this, you can get to the point that you can almost set up a new mike visually without even listening to it!  (Almost...nothing replaces a good pair of ears.)  

If you don't have a lot of time in the seat with headphones monitoring your own audio, it may be best to do the record-and-playback routine, because when listening to yourself with headphones you will also hear your own voice through bone conduction in your own head which will make you think that you sound different than you really do.  You can train your brain to ignore (or at least recognize) this effect, but it may be quicker to listen to a recorded signal.  

BTW... if you haven't read it elsewhere, simply using MON and listening to yourself while transmitting will NOT give you any indication of your actual transmitted signal.  MON is tapped BEFORE Filtering, Processing and TX EQ (due to latency issues) .

As you adjust your TX EQ, the rule is "Cut first, then boost"  i.e. CUT what is excessive first, then ADD what you want to enhance further.

Hope this helps you on your journey toward excellent audio.

Ken - NM9P
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Joe Sartori - K3WTF

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Ken you are so right.  I have a hard time with doing my own settings...  Can I impose on you to try to meet up on the air so you could help me with my mic profiles.  I would appreciate it!!!
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Not to bring up an old post but ..... I have a 6700 and am trying to get a ProSet Plus headset with the HC4 (or HC5 - I prefer the 4 when used on my Yaesu 5000) and am not having any luck getting decent audio. It sounds like RF/hum is getting in but I'm running all of 2 W into a dummy load (or antenna - no difference in results) and everything is well grounded with very short heavy grounds ... the adapter is a Heil AD-1-Y which I see have comments on the web about missing wiring - something about pin 5 to 7 and/or the shell?

Also - do I need to turn on 'bias' for this element (I think not but I've tried most everything else to no avail)?

I have to adjust it to 100% mic to get something that is still not close to full 0 scale on the VU meter ... and then the hum is loud but the signal is not much above it.

I suspect some will say its the 8 pin foster connector - DXE shows this IS the right adapter to be used with this radio and this headset! HOWEVER if I plug it, the 3.5mm mic plug, directly in to the Maestro I get the same results which would suggest it isn't the foster connector...

when I move the mic gain knob on the Maestro I get this musical chimes in the headset - random - irratic but kind of a chirp as I turn the knob... note further I ran it with the Maestro completely disconnected using SSDR - no difference.

I bought the radio used - I'm wondering if it is defective for SSB.