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Everything posted by pat_in_dfw

  1. Thanks for the offer. I have a calibration mic already that I use when I set up DSPs in a room. I'm an AV engineer in my real job and speaker enthusiast as a hobby. I normally use the mic with a pc based spectrum analyzer. This will be an interesting addition.
  2. pat_in_dfw

    What I Got Today!

    My new coffee mug!
  3. Yes they were Is and not IIs. But like a car, the biggest hit in value is when you drive it off the lot. 10 years old vs 30 years old isn't a giant difference. Some, yes. Good luck. If you can sell yours then that will only help to establish the value higher.
  4. How do you "measure" T/S parameters vs reading them from the spec sheet?
  5. Good luck in your sale. You're asking $1700 PER speaker. I've had a PAIR in very good condition listed at $1400 for over a month without any serious interest.
  6. I'm moving over the summer and still looking for a house. Top on the list is a media room isolated from the rest of the house. And a wall long enough to put the DBB's in the corner and 3 LaScalas in between. I'm very anxious to get moved so I can set it up. I can only imagine 24hz at 120db.
  7. I've used MCM and Parts Express over the years with no problems at all. The reason I'm trying to find drivers for the DBB is because I'm going to have a pair of cabinets passed down to me that several other forum members have used. The cost is free wirh the condition that I don't resell it. If at some point I can't use them I will pass them along to someone else on the forum. While I have built cabinets in the past, have the tools and the skills to do it, I couldn't pass up a chance to get these cabinets.
  8. I changed the box parameters to 6.3 cu ft and adjusted the port tuning for best performance and I think I found a winner! First I'll discuss what I found. in many cases I would have to take the advice given and change the port tuning. The port tuning is noted. The box is tuned to 42hz so anything else would require modification. Power handling shown is PER DRIVER, so cabinet power would x2 Power Acoustik (MOFO-152X) $159 (purchased through MCM Electronics) Tuning at 24hz, F3 at 24hz Power (RMS) 1700 Sensitivity 87 dB 1W/1m Emminence Lab15 $285 Tuning at 32hz, F3 at 31hz Sensitivity 88.5 dB 1W/1m Power Handling (RMS) 600 Watts Selenium 15SWS800 $215 Tuning at 37hz, F3 at 38hz Sensitivity 93 dB 2.83V/1m Power Handling (RMS) 800 Watts MCM Audio Select (55-2953) $31 Tuning at 36hz, F3 at 40hz Sensitivity (1W/M): 98 dB Power Handling Capacity: 200W RMS Emminence Kappa 15LFA $125 Tuning at 42hz, F3 at 45hz Sensitivity 99 dB 1W/1m Power Handling (RMS) 600 Watts Emminence KappaLite 3015LF $200 Tuning at 42hz, F3 at 46hz Sensitivity 99.4 dB 1W/1m Power Handling (RMS) 450 Watts So......with an f3 of 24Hz with a modified tuning frequency and a power handling of 3400w RMS per cabinet, the MOFO-152X looks like a clear winner. I have 2 QSC CX302 amps that will output 700w into 8 ohms in bridged mono. I'll run one on each sub. With a sensitivity of 90db per speaker (2 drivers coupled), I can get 90db = 1w 93db = 2w 96db = 4w 99db = 8w 102db = 16w 105db = 32w 108db = 64w 111db = 128w 114db = 256w 117db = 512w
  9. Yes it is available. I found pics and the driveris actually a 2445J. That might be close enough to use as a center if you have a matching L/R, but not sure if that's close enough to what you need. I'm not sure off the top of my head what the exact horn is, but hopefully the attached pics will help. Patrick
  10. Thanks. I will edit my model. I was using 6 cu ft and 34hz.
  11. I don't think at that price you would expect original metal badges. They look good and after being installed I can tell the difference only because I'm looking for it.
  12. I have ONE with the driver and horn. I picked up the front speakers from a theater that closed and I got all the bass bins, but they had sold the L/R horns already and only had the center left. Not much I can do with only one horn, so if you want a full L/C/R set you've got three horns here.
  13. I have LaScalas for my mains and those go pretty strong down to around 50hz. I was hoping to use these AS a subwoofer to extend the bass from the LaScalas down lower while accenting the "thump" factor. I'm going to be moving in June, so I probably won't even get a chance to set these up until after I move. I'm getting them now because the previous owner is moving and needs them gone. I'll likely try the MCM driver with DSP knowing that I can return the MCM within 30 days. I wish I could get an answer sooner, but it will likely be mid summer before I get any useful data.
  14. If they were built for those drivers, can you explain the performance and why the low end virtually disappears below 50hz? I've attached the response graph for the K33 in that cabinet. I was looking for a driver to extend the low end further. Even without EQ the MCM driver extends almost 10hz lower than the K33.
  15. I still have 2 of these that I used in my old house as part of the whole house audio distribution system. "New" house wasn't technically new so I couldn't run the cables where I needed for audio in every room so I'm not using the amps now.
  16. I have a pair of Quartets that are very similar in sound to the Heresy. It would be a tight fit with their 12" depth which would only leave a bit less than 2" for the passive radiator. I think those need to be at least 6 inches from the wall so those might work. I also have a pair of KG3s which have a very nice sound and aren't very deep (11") if you are interested. Since you're in DFW you could come listen to them before making a decision.
  17. I just ordered a badge for less than $20. http://www.ebay.com/itm/322463632699
  18. It wasn't the fact that it was the cheapest. I don't have unlimited funds so I was looking at the best performance/price ratio. I looked at the best performance that I could get regardless of cost without changing the port tuning and that came from the Lab15 at a cost of $285 per driver ($1140). That gave a response down to 32hz with a slight boost at 40hz that should help the low end. The MCM drivers start to fade around 50hz but are -3db at 42. There is one factor that makes the decision look better once I explain it. It's not just the cheapest speaker, but it's also the best performing. The big factor that might be easily overlooked is the sensitivity. The MCM driver is 10db higher than the Lab15. The actual response of the MCM is -10db at 28hz while the Lab15 is -3db at 32hz. To illustrate this I've overlaid the MCM freq response with the Lab15. I can use a Biamp DSP (I have several Nexias laying around) to pull the levels down starting at 30hz and above to make it completely flat from 30hz to 100hz. Given the Lab15s sensitivity of 88db, the MCM's in-box response is -3db at 28hz given 1w power measured at 1m and flat at 88db from 30hz to 100hz. With the aid of the Biamp DSP the MCM drivers are -3db at 28hz with a flat response up to 100hz. For a total cost of the drivers of less than $130. That's the reason I am leaning toward the MCMs - not just because they are cheaper.
  19. I don't know that many horn loaded designs that will give much bass extension other than the Khorn that won't take up half the room. The price on the DBBs are right (free) so I'm trying to come up with a driver to maximize the cabinet. The power ratings were RMS and meant to show a comparison between drivers.
  20. I sent this message in a p.m. to a member previously because we were having a discussion but I thought it would be a good conversation topic for the entire group and hopefully I can get some Brains involved who are much smarter than me to offer their input. I am going to pick up a set of DBBs this coming weekend. They don't have drivers so I need to find ones that work. Previous comments have been to use the Emminence Kappalites or the K33 Cornwall driver but I want to extend the bass and use this as a subwoofer to complement LaScala mains. I based my model off a 6 cu ft volume and tuning of 34hz. If these values are not right please tell me. I've looked at the Kappalite as well as others. I'll list what I found. Crites: I looked at Crites Cornwall replacement woofers mainly as a price reference. I couldn't find the T/S parameters but I'll admit that I didn't look hard either. Our CW1526C 15 inch Cast Frame Woofers. Replacement for the Klipsch K-33E for Klipschorn, Belle Klipsch, and Cornwall. Shipping is $25.00 by FedEx in the US. (Not for the LaScala). Model CW1526C Pair: $275.00. Our CW1526 15 inch Stamped Steel Frame Woofers. Replacement for the Klipsch K-33E for Klipschorn, Belle Klipsch, Cornwall and LaScala. Shipping is $25.00 by UPS in the US. Model CW1526 Pair: $240.00 Our CW1526F has the same specs as our CW1526. Difference is that the CW1526F has a thinner front gasket and a second gasket behind the frame. This woofer works better for flush mounting in a motor board such as that on the Cornwall II. It also works well for rear mounting for the Cornwall 1. Shipping is $25.00 per pair in the US. Model CW1526F Pair: $260.00 Based on the box volume of the Cornwall (6 cu ft) and a tuning frequency of 32hz-34hz I ran the following drivers with the results as shown: Klipsch K33e (Emminence 15162) (cost ??) (300w RMS per cabinet) SPL dB 96.6 F3 of 50hz with 34hz port tuning (not great - I can't see using the stock K33e for low frequencies) Eminence Kappalite 3015LF ($199 each) (900w RMS per cabinet) Sensitivity 96 dB F3 of 52hz (not really that low - I couldn't see using this) Emminence Lab15 ($285 each) (1200w RMS per cabinet) Sensitivity 88.5 dB F3 of 32hz (nice, but at that price it's almost $1200 for 4 drivers) Dayton Audio DCS380-4 15" Classic Subwoofer 4 Ohm ($87 each) (500w RMS per cabinet) Sensitivity 93.6 dB For this I would have to lower the tuning frequency to 19hz by making the port opening smaller or adding to the length. Final results of F3 at 30hz Goldwood GW-15PC-4 ($88 each) (550w RMS per cabinet) Sensitivity 94.9 dB F3 of 34hz with no adjustments to tuning frequency Goldwood GW-15PC-8 ($89 each) (550w RMS per cabinet) Sensitivity 92.3 dB F3 of 35hz Dayton Audio UM15-22 15" Ultimax DVC ($189 each) (1600w RMS per cabinet) Sensitivity 86.5 dB Would have to change the port tuning to 22hz by closing off some of the port opening or changing port length. F3 of 24hz with adjusted port tuning Dayton Audio RSS390HF-4 15" Reference HF Subwoofer 4 Ohm ($155 each) (1000w RMS per cabinet) Sensitivity 91.2 dB Would have to change the port tuning to 22hz. F3 of 24hz with adjusted port tuning Dayton Audio RSS390HO-4 15" Reference HO Subwoofer 4 Ohm ($165 each) (1600w RMS per cabinet) Sensitivity 92.8 dB slightly adjust tuning frequency to 29hz F3 of 28hz with adjusted port tuning MCM Audio Select (55-2953) ($32 each) (400w RMS per cabinet) Sensitivity (1W/M): 98 dB (very nice) F3 of 42hz at 34hz port tuning With all of this data I think I can toss out the idea of using the stock K33 driver because it would have a low end F3 of barely 50hz. I don't know how the Cornwall claims a low end of 34hz unless it's -10db at 34hz. Based on the price vs performance I'm leaning toward the MCM 55-2953. It only handles 400w RMS, but with the efficiency of 98db I don't think it will need very much power to reach high levels. I can live with an F3 of 42hz at that price. To get what I really want I would have to use the Dayton HF sub with a change in the port tuning to get a F3 of 24hz. But $155 per driver vs $32 per driver is quite a big difference. Given a 3bd increase every time power doubles the output for the MCM driver would be: 1w = 101db (two drivers coupled together gives a 3db increase) 2w = 104db 4w = 107db 8w = 110db 16w = 113db 32w = 116db 64w = 119db 128w = 121db 256w = 124db 400w = 125db or 126db That means by spending $130 I could get 125db levels......not bad. What are your thoughts?
  21. I have 3 of the industrial LaScalas for my theater and I haven't opened then up. The seller of the L/R told me the caps were changed in 2016 and the L/R use a Crites tweeter. Patrick
  22. So that means they would have a B3 crossover, right?
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