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Re: HowieZ's T24 build

Posted: Fri Oct 20, 2023 12:43 pm
by Bruce Weldy
Bill Fitzmaurice wrote: Fri Oct 20, 2023 12:11 pm To some extent, yes, but I wouldn't recommend it. Why would you have to?
Because Seth still hasn't warmed to the idea that, "Just because you can, doesn't mean you should". :mrgreen:

But, I like that he's constantly pushing the boundaries. At my age, I'd rather lean up against the boundaries and take a nap.

Re: HowieZ's T24 build

Posted: Fri Oct 20, 2023 2:57 pm
by Seth
Bill Fitzmaurice wrote: Fri Oct 20, 2023 12:11 pm
Seth wrote: Fri Oct 20, 2023 11:30 am Question/clarification please... The lower frequencies which see the most benefit from the use of a V-plate would still benefit, even if the cabs were a foot or two apart and "V-plated"?
To some extent, yes, but I wouldn't recommend it. Why would you have to?
I ask purely out of curiosity and the opportunity to glean as much valuable information and knowledge from you as I can. Thank you Bill :thumbsup:

Re: HowieZ's T24 build

Posted: Fri Oct 20, 2023 3:11 pm
by Seth
Bruce Weldy wrote: Fri Oct 20, 2023 12:43 pm Because Seth still hasn't warmed to the idea that, "Just because you can, doesn't mean you should". :mrgreen:

But, I like that he's constantly pushing the boundaries. At my age, I'd rather lean up against the boundaries and take a nap.
You got me there :owned:

Re: HowieZ's T24 build

Posted: Tue Nov 07, 2023 11:02 am
by howiez
Bruce Weldy wrote: Fri Oct 20, 2023 12:43 pm Because Seth still hasn't warmed to the idea that, "Just because you can, doesn't mean you should". :mrgreen:
I'm guilty of this too, using odd drivers etc. But I did FTP 99% this time, only choosing a home/non-pro driver since i'm no pro. And I think only one spec was off by more than 10%. Maybe some day Seth will simulate them in Hornresp for me, LOL.

Well I have not had time for a proper A/B comparison outdoors and weather is starting to get yucky here. It was 66F yesterday so I did take the opportunity to set up the T24's outside with my DR200's. I took the Driverack profile for stereo tops mono subs, flat eq, 120Hz crossover and limits from my T48's and copied it. I then modified the limiter a bit, since these drivers have nearly double RMS that of my Celestions in the T48's. I still limited at just under 40v, and left LF cutoff at whatever the T48's were set to. It's been over a year since I've setup a preset in the PA2 and I really struggled. Could not find the mono/stereo setting, as I wanted to make both mono. Could not get limiter to do what I thought it should. I used the 'rack's pink noise generator while measuring voltage. I was thinking I'd get 50v out of my crown XLS 2502, but I was barely hitting 40, signal gain maxed, and amp gain maxed (not bridged 775w@4ohms).

I think they sound great, in the middle of my concrete driveway 10ft from garage front, but both doors open. My truck was 10ft behind it but off to side. Definitely plenty of bass near them, and they sounded great 100ft away in yard. I did not v-plate, I have not cut one yet. They were just sitting side by side, parallel to each other, DR200's sitting on them (when not rattling off). For sure a v-plate and a boundary will help. They are killer loud in my 1 car workshop. I listened to a few 80s' rock tracks, some Peter Gabriel with deep bass (no so much with HPF), one EDM track and a couple pop/dance Rihanna type songs. I have zero complaints. Would probably build a second pair and ditch the Titans if I did this for a living, since it would pack easier. But alas, I may never give up my Titans.

My daughter-in-law said she heard the DR's from a block away. They live 2 blocks away and she was out for a stroller ride with my 9mo grandson. I had to turn it to un-eleven so I don't hurt his precious ears. I would not wish tinnitus on anyone. One of my other neighbors 3 houses down and across the street FB messaged to say it was working. A few neighbors are planning a block party and said I have music covered so it's all in good fun!

I will do a proper A/B maybe in spring and post a full review in that section, just wanted to drop a quick update.

Re: HowieZ's T24 build

Posted: Tue Nov 07, 2023 10:40 pm
by Tom Smit
Nice neighborhood, LOL!

Re: HowieZ's T24 build

Posted: Sat Nov 11, 2023 9:49 am
by Seth
howiez wrote: Tue Nov 07, 2023 11:02 am ...Could not get limiter to do what I thought it should. I used the 'rack's pink noise generator while measuring voltage. I was thinking I'd get 50v out of my crown XLS 2502, but I was barely hitting 40...
Need to test amplifier output voltage while playing a sinewave. The inexpensive digital multimeters we use can only measure the amplitude of one pure frequency waveform at a time. Most expensive meters too.

I usually use 60Hz for subs, but any frequency should work.

Re: HowieZ's T24 build

Posted: Mon Nov 13, 2023 4:34 pm
by AntonZ
Bruce Weldy wrote: Fri Oct 20, 2023 12:43 pmBut, I like that he's constantly pushing the boundaries. At my age, I'd rather lean up against the boundaries and take a nap.
:lol:
I can relate to that.


Damn, I think I have been in denial, but must be getting older regardless. Thanks for rubbing it in, Bruce :slap:

Re: HowieZ's T24 build

Posted: Tue Nov 14, 2023 9:39 am
by Rich4349
howiez wrote: Tue Nov 07, 2023 11:02 am ...I was thinking I'd get 50v out of my crown XLS 2502, but I was barely hitting 40, signal gain maxed, and amp gain maxed (not bridged 775w@4ohms)...
What is your source? Try measuring the voltage output of your source. If it's not in the middle of your amp(s)' input range, you may want to consider picking up a pre-amp to fatten up the signal voltage some. I had a similar issue and got this:

https://www.amazon.com/gp/product/B006I ... UTF8&psc=1

It was exactly what the doctor ordered and now my amps put out all their advertised specs, even with an underpowered PC output voltage.

Re: HowieZ's T24 build

Posted: Tue Nov 21, 2023 1:48 pm
by howiez
Seth wrote: Sat Nov 11, 2023 9:49 am
howiez wrote: Tue Nov 07, 2023 11:02 am ...Could not get limiter to do what I thought it should. I used the 'rack's pink noise generator while measuring voltage. I was thinking I'd get 50v out of my crown XLS 2502, but I was barely hitting 40...
Need to test amplifier output voltage while playing a sinewave. The inexpensive digital multimeters we use can only measure the amplitude of one pure frequency waveform at a time. Most expensive meters too.

I usually use 60Hz for subs, but any frequency should work.
Thanks Seth, I forgot, I was using pink noise or sumptin, I forget already.

Rich4349 wrote: Tue Nov 14, 2023 9:39 am
howiez wrote: Tue Nov 07, 2023 11:02 am ...I was thinking I'd get 50v out of my crown XLS 2502, but I was barely hitting 40, signal gain maxed, and amp gain maxed (not bridged 775w@4ohms)...
What is your source? Try measuring the voltage output of your source. If it's not in the middle of your amp(s)' input range, you may want to consider picking up a pre-amp to fatten up the signal voltage some. I had a similar issue and got this:

https://www.amazon.com/gp/product/B006I ... UTF8&psc=1

It was exactly what the doctor ordered and now my amps put out all their advertised specs, even with an underpowered PC output voltage.
Rich, it was the pink noise generator in my PA2, but Seth has reminded me to use a sine wave.

Re: HowieZ's T24 build

Posted: Wed Nov 22, 2023 9:13 am
by Bruce Weldy
howiez wrote: Tue Nov 21, 2023 1:48 pm
Rich, it was the pink noise generator in my PA2, but Seth has reminded me to use a sine wave.
Just remember, when setting voltages with a sine wave through a Driverack - you be sure the Feedback Eliminator is turned off or it will see that wave as feedback and you'll get nothing.....ask me how I know.....

Re: HowieZ's T24 build

Posted: Fri Mar 22, 2024 10:34 am
by CarterKraft
howiez wrote: Sat Sep 09, 2023 10:56 am I printed another inset ring for next time. Now I can spotface the 2" dia for the Speakon connector flange, then place the insert for the 1" clearance hole for the body. I used it to clean up mine a bit, but alas, i had destroyed them with the auger bit.
20230908_165942.jpg
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These 3d templates are really smart!