CSL-Calibrated EMM-6 Microphone Sale

**JimP** · **10-22-09, 03:05 AM**

Were the sale mics with the basic calibration, calibrated down to 5 or 10hz?

**Anechoic** · **10-22-09, 03:26 PM**

Quote:

JimP wrote:

Were the sale mics with the basic calibration, calibrated down to 5 or 10hz?

All mic cals I do for 1/2-inch form-factor microphones are down to 5 Hz now. I made that change a few months ago because it got to be too much of a hassle trying to remember which order at 5 Hz, which had 10 Hz, etc.

**Anechoic** · **10-22-09, 03:28 PM**

Quote:

nerdful1 wrote:

I figure I could strap on a couple 9 volt batteries till I build a nice little phantom power preamp box to fit in my ISF equipment bag.
What would 9v vs 48v limit me to. I am not looking for SPL, or recording, just sane frequency response room testing. Then, it is easy to clip enough 9 volts together for anything. (I've clipped 10 together for antique tube portable radios). Is just that I am eyeballing the mic in front, the Otari a few feet away...

You would probably want to use at least two 9V to get you up to 18V. The only thing lower phantom power gets you is a lower high-SPL limit by a few dB. If you're not going to be using it at high SPL's, it's not a big deal.

**Anechoic** · **10-23-09, 05:14 PM**

For people who are still interested in the discounted EMM-6 special - if I can get 20 or more orders, I can offer the discounted pricing again. I have to run right now, but I'll set up a sign-up page on my site later for people who might be interested.

**Anechoic** · **10-24-09, 01:10 AM**

Okay, I posted a sign-up page where you can enter your contact info if you're interested in the deal. If/when I get enough interested people, I'll contact everyone and put up a page where people can place orders.

Oh, and to sweeten the pot a little, HTS members get the same $5-off deal (in addition to the already discounted pricing) as before.

edit: So I'm an idiot... I put up the form but forgot to put up a "submit" button. It's fixed now.

**Anechoic** · **10-27-09, 12:49 AM**

Update: If I can get 5 more people, I'll pull the trigger.

**nerdful1** · **10-27-09, 01:33 AM**

Just a big thanks for offering your services.
Tonight I was rummaging through my stuff from xlr xfmrs, to heath and sound technology thd im distortion analyzer boxes, to Revox and Otari clunkers. Decided to order the 8 ch Behringer whatever box and be done with it....

Now, should I send a modified original RS spl meter to you to be calibrated? At the moment I forgot what I did, except the bass is supposed to be better. Before finding you and the Dayton, I was about to bring it to the SPL calibration place in Portland.

**Anechoic** · **10-27-09, 12:58 PM**

Quote:

nerdful1 wrote:

Just a big thanks for offering your services.
Tonight I was rummaging through my stuff from xlr xfmrs, to heath and sound technology thd im distortion analyzer boxes, to Revox and Otari clunkers. Decided to order the 8 ch Behringer whatever box and be done with it....

Now, should I send a modified original RS spl meter to you to be calibrated? At the moment I forgot what I did, except the bass is supposed to be better. Before finding you and the Dayton, I was about to bring it to the SPL calibration place in Portland.

You're certainly welcome to send it to me for calibration if you want to assess it's performance or generate a correction curve for it. Pricing is described here. Hit me up and let's figure out what you need.

**Dennis H** · **10-27-09, 02:45 PM**

Quote:

Anechoic wrote:

Interesting question indeed.

It's an open-loop voltage measurement.

Herb, can you explain a little more about how you do that? Most phantom power boxes and mic preamps have a pretty low input impedance. My Emu Tracker is 1500 ohms and the Presonus Firebox you said you use is 1300. I'm on the list for the latest round and I'm wondering if/how I should adjust the sensitivity you measure.

**Anechoic** · **10-27-09, 03:30 PM**

Quote:

Dennis H wrote:

Herb, can you explain a little more about how you do that? Most phantom power boxes and mic preamps have a pretty low input impedance. My Emu Tracker is 1500 ohms and the Presonus Firebox you said you use is 1300. I'm on the list for the latest round and I'm wondering if/how I should adjust the sensitivity you measure.

The sensitivity measurements are performed with an acoustical calibrator and a Sencore SP395 which has input impedances of > 40 kohms.

**Dennis H** · **10-27-09, 03:50 PM**

Quote:

Anechoic wrote:

The sensitivity measurements are performed with an acoustical calibrator and a Sencore SP395 which has input impedances of > 40 kohms.

Thanks, Herb. When you get your shipment of EMMs in, could you do a quick check and compare the voltage measured with the Sencore to the voltage measured with the Firebox?

**Anechoic** · **10-27-09, 04:05 PM**

Quote:

Dennis H wrote:

Thanks, Herb. When you get your shipment of EMMs in, could you do a quick check and compare the voltage measured with the Sencore to the voltage measured with the Firebox?

I don't have a practical way of doing that - the Firebox input has a continuously-variable gain setting with no "0 gain" position so I have to back into the 0-gain setting using the calibrator and Sencore.

**Dennis H** · **10-27-09, 04:50 PM**

You should be able to calibrate the Firebox (as long as you don't touch the pot) with a loopback cable and the ARTA calibration setup. Use a splitter for the best accuracy so you can measure with a DVM at the same time you're doing the loopback. Then for a measurement, run the spectrum analyzer with an external signal and go to the time record window. The RMS voltage is displayed at the top.

Edit: with all your fancy gear, all you really need is the splitter cable. See if the reading on the Sencore changes depending on whether or not the Firebox is plugged into the other leg. Turn phantom power off on the Firebox.

**Anechoic** · **10-27-09, 05:10 PM**

You know, considering I've done the ARTA calibration process before, I really should have remembered that! Thanks for the info.

To answer your original question, using a 1 kHz, 94 dB sine wave generated from my GenRad calibrator into an EMM-6 microphone, I get the following RMS levels:

Sencore SP395: 6.995 mV
Presonus Firebox: 6.981 mV

**Dennis H** · **10-27-09, 05:22 PM**

Quote:

Anechoic wrote:

You know, considering I've done the ARTA calibration process before, I really should have remembered that! Thanks for the info.

To answer your original question, using a 1 kHz, 94 dB sine wave generated from my GenRad calibrator into an EMM-6 microphone, I get the following RMS levels:

Sencore SP395: 6.995 mV
Presonus Firebox: 6.981 mV

Excellent! Looks like it's a non-issue then.

**Anechoic** · **10-28-09, 04:12 PM**

Okay, it looks like we're on for the group buy.

About half of the responses I got were of the "might buy" variety. If a good number of those decide to purchase the mic, I can pony up the cash for the remaining mics and we'll be in good shape. If all of them "might buy" responses don't decide not to buy, I'll probably cancel the deal.

My plan is to keep the sale open through Friday (maybe Saturday). I figure that if I can place the order by Friday or Monday, I should be able to turn around most (if not all) of the mics by the end of next week. However if I don't get enough orders, I will cancel the deal.

If you order a microphone and the deal is canceled, I *will* refund all of your money. (and if I try to keep you money, you can seek recourse through the Massachusetts Board of Professional Licensure and I can assure you that the amount of grief that will rain down on me is not worth the risk of trying to rip you off).

If you're ready to order, you can go over to my site to place your order. And don't forget that HTS members get an additional $5 off - leave your HTS username with your order in the "Additional instructions to seller" on the PayPal page and I'll refund the $5.

As always, if you have any questions, feel free to ask.

**BK_856er** · **10-28-09, 04:28 PM**

Order placed!

BK

**Anechoic** · **10-30-09, 01:10 AM**

I got a few orders, but most of the "definitely will buy" orders haven't materialized. In fact I got one email from a person who didn't think things would move this quickly and wasn't prepared to order so soon.

It's looking like I may cancel the buy and refund the money. One thing I might do is just offer a limited quantity of "pass-through" EMM-6's which the included Dayton cal curve but without my calibration for $40+ shipping ($49 USD). That would still save $10 compared with the PE pricing but I don't want to offer a lot of those since I would be taking a small loss on each mic (which would hopefully be made up for on the calibrated mics). I'll sleep on it and make a decision tomorrow.

**Nick** · **10-30-09, 02:02 AM**

I'd like to order a calibrated EMM-6. Can you please tell me the price if you are not able to do the 'group buy'? Also, I am unclear on which version I should order. I will be using it to do full-range measurements (assuming I can figure out how to do so) in my two channel music room for speaker placement, acoustics and perhaps adding a sub and EQing.

Thanks

**Anechoic** · **10-30-09, 11:35 AM**

Quote:

Nick wrote:

I'd like to order a calibrated EMM-6. Can you please tell me the price if you are not able to do the 'group buy'? Also, I am unclear on which version I should order. I will be using it to do full-range measurements (assuming I can figure out how to do so) in my two channel music room for speaker placement, acoustics and perhaps adding a sub and EQing.

Thanks

If the group order doesn't go through, you can always order the normally-priced calibrated ECM8000's (the same basic mic, costs are about $10 more than the EMM-6 deal).

I can tell you that if you do order a mic, you'll be the swing vote for moving the group deal forward.

If you're going to be doing room acoustics, I'd recommend getting a Basic+ models so you'll have the off-axis calibration data.

**Anechoic** · **10-30-09, 01:27 PM**

Okay, we're definitely on for the group buy, I got enough pre-orders to make the minimum order.

I've been asked by a couple of people for a little more time, so I'm going to accept orders through the weekend, close the page on Monday and place the group order with PE on Monday. The plan is to have the order shipped to me via two-day freight which means I'll get them late on Wed, I can start processing them on Thursday and I should be able to get a couple dozen orders out on Friday (I'm getting a lot of Basic orders which take much less time to process than Premium orders so things should move quickly). It is likely that orders made after today won't ship until Nov 7 or Nov 9. but unless I get completely overwhelmed with orders (which doesn't seem likely) I think I should be able to ship all orders by Nov 9 or 10th at the latest.

Thanks again guys.

**Audioguy** · **10-31-09, 11:45 AM**

How do I order one of these?

**robh** · **10-31-09, 12:10 PM**

Quote:

If you're ready to order, you can go over to my site to place your order http://www.cross-spectrum.com/measur...ed_dayton.html . And don't forget that HTS members get an additional $5 off - leave your HTS username with your order in the "Additional instructions to seller" on the PayPal page and I'll refund the $5.

Edited to add quotations... Admin.

**trans40** · **10-31-09, 12:26 PM**

I purchased a CSL-calibrated EMM-6 from Anechoic just a few weeks ago. It's been perfect for my home audio application. Having the calibration values on disk is great - my software read them without any problems. I'm very satisfied with my purchase at the usual price.

So this is a very good deal, offered by the kind of person with whom you want to do business. No nonsense, offers a quality product, and sells it at a fair price. If you want a mic, this is the way to go unless your needs demand a studio-level reference mic, at 10 times this price (used) and up.

Thom

**leelee** · **10-31-09, 12:32 PM**

I've been using a Nady CM-100. Just placed an order for a calibrated Dayton.

I had a question - just how much variation is there between these microphones that appear to have been made by the same factory? For example, I looked at the sample calibration info for a ECM8000 and the Dayton, they looked quite different in the bass region. I've never see any data for the Nady version.

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