beeker Posted March 27, 2015 Share Posted March 27, 2015 It's definitely not going to Hope, at least not with me. This sub does not belong to me at this point. My only goal now is to get it safely to Ronnies. Mark, if you really want to hear it, you'll be a short 5 or 6 hour drive away when you come to the gathering I was joking gosh 5-6hr drive thank you higher power! at least I aint the only one driving FAR we're at least double that here Quote Link to comment Share on other sites More sharing options...
Thaddeus Smith Posted March 27, 2015 Share Posted March 27, 2015 the cinema f-20 I wonder how many builds ago that was? Time flies. Got it just before Adelaide was born, which was 3 years ago today. Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted March 27, 2015 Author Share Posted March 27, 2015 Got it just before Adelaide was born, which was 3 years ago today. Tell her happy belated from me. I could look at the F-20 build thread and figure out how long ago it was but wondered how many subs I've built since then. I'm thinking 7 or 8. Quote Link to comment Share on other sites More sharing options...
Thaddeus Smith Posted March 27, 2015 Share Posted March 27, 2015 at least 4 or 5 I think? Quote Link to comment Share on other sites More sharing options...
twk123 Posted March 27, 2015 Share Posted March 27, 2015 Got it just before Adelaide was born, which was 3 years ago today. Tell her happy belated from me. I could look at the F-20 build thread and figure out how long ago it was but wondered how many subs I've built since then. I'm thinking 7 or 8. Hey I just read your F-20 build thread and am inspired. I noticed you tested the sub with a 250 W plate amp. Could I use this amp to run the sub normally? I have a pretty small room and dont need gobs of bass output, just clean and low. My SW-12 amp is getting worse and I figured I could get the $130 Dayton audio 250 W for it now as it puts out about 154 W RMS into 8 ohms and I will use an inline High pass filter at 30 hz so I dont kill it. Then when I get the time and money to actually do the build I can simply use the 250W amp on the f-20? Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted March 27, 2015 Author Share Posted March 27, 2015 250 would be fine. Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted March 27, 2015 Author Share Posted March 27, 2015 (edited) I wouldn't worry with the high pass filter either. EDIT, you're talking about using the high pass filter on the SW-12 correct? I meant to say you wouldn't need the high pass filter on the F-20. Edited March 27, 2015 by CECAA850 1 Quote Link to comment Share on other sites More sharing options...
twk123 Posted March 27, 2015 Share Posted March 27, 2015 I wouldn't worry with the high pass filter either. EDIT, you're talking about using the high pass filter on the SW-12 correct? I meant to say you wouldn't need the high pass filter on the F-20. That is correct, the sub range on the manual says 28 hz so I figured I would get one of these as an insurance policy for now: http://www.parts-express.com/harrison-labs-fmod-inline-crossover-pair-30-hz-high-pass-rca--266-248 Thanks for all the advice btw Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted March 27, 2015 Author Share Posted March 27, 2015 No problem. Those filters might be better than nothing but that's about it. Save your money and just watch your gain. Quote Link to comment Share on other sites More sharing options...
derrickdj1 Posted March 27, 2015 Share Posted March 27, 2015 The filters are for safety but, do not gurantee against driver damage. Also set the hold/release or attack parameters on the amp. This will protect the driver and amp. Use the voltage rating of the driver. Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted March 27, 2015 Author Share Posted March 27, 2015 Also set the hold/release or attack parameters on the amp. You're talking about digital controls of which none of the amps referred to in this thread have. Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted March 27, 2015 Author Share Posted March 27, 2015 we're at least double that here I'm glad I'm relatively close. Quote Link to comment Share on other sites More sharing options...
babadono Posted March 27, 2015 Share Posted March 27, 2015 I wouldn't worry with the high pass filter either. EDIT, you're talking about using the high pass filter on the SW-12 correct? I meant to say you wouldn't need the high pass filter on the F-20. That is correct, the sub range on the manual says 28 hz so I figured I would get one of these as an insurance policy for now: http://www.parts-express.com/harrison-labs-fmod-inline-crossover-pair-30-hz-high-pass-rca--266-248 Thanks for all the advice btw How do they know what output impedance is driving this and to what input impedance? Maybe a little better than nothing but it only does exactly what is says it does at one specific output impedance into one specific input impedance. Quote Link to comment Share on other sites More sharing options...
derrickdj1 Posted March 27, 2015 Share Posted March 27, 2015 You're talking about digital controls of which none of the amps referred to in this thread have. I forgot about that, I am so use to using DSP and PEQ with the subs. A mini DSP would go a long way in setting up the subs and provide some protection. Carl, do you use plate amps in all your builds? Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted March 27, 2015 Author Share Posted March 27, 2015 Carl, do you use plate amps in all your builds? Most, not all. On the horn builds, you can use a plate amp but you can't mount it to the box like you can a sealed or ported build. You have to build an external box as the guts of the amp would be in one of the horn paths. Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted March 27, 2015 Author Share Posted March 27, 2015 How do they know what output impedance is driving this and to what input impedance? Maybe a little better than nothing but it only does exactly what is says it does at one specific output impedance into one specific input impedance. They don't, that's why I told him to save his money. Quote Link to comment Share on other sites More sharing options...
twk123 Posted March 27, 2015 Share Posted March 27, 2015 (edited) How do they know what output impedance is driving this and to what input impedance? Maybe a little better than nothing but it only does exactly what is says it does at one specific output impedance into one specific input impedance. They don't, that's why I told him to save his money. So at the end of the day just play it by ear and make sure its not making any bad noises? The SW-12 is an 8ohm driver and the amp is 150 w RMS while the new amp will be this: http://www.parts-express.com/dayton-audio-spa250-250-watt-subwoofer-plate-amplifier--300-803 It says its 156w RMS into 8ohms which is pretty close. Will the balance of the passive radiator system keep the sub from going too low to damage it or is there a high pass built into the stock amp that I will need to replicate if using a normal plate amp? EDIT: It looks like the amp has a high pass of 20Hz from the website. As it is now the current amp is far more likely to damage things by not throwing a clean wave at the driver so I dont have much to lose, specifically if I am planning on going DIY in the near future anyway. My receiver does not have any EQ and I dont have any inline DSP ability. Edited March 27, 2015 by twk123 Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted March 27, 2015 Author Share Posted March 27, 2015 You'll hear the driver or passive start to bottom out if you push it too hard. You said you were in a small room and don't need lots of bass so you should be fine. Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted March 28, 2015 Author Share Posted March 28, 2015 Last shot at my house. It's currently in Ron's living room loafing along, trying not to overpower the RF7 II's. It's crossed over at 60 Hz. I ran it about 6-8 dB hot and we're barely using half the amp. It's ridiculous how powerful this combo is. I'm sure he'll be along any time now to give his impressions. 2 Quote Link to comment Share on other sites More sharing options...
mxr dad Posted March 29, 2015 Share Posted March 29, 2015 (edited) And here she is in her new home. I'm happy to say she is safe and sound and getting along with the RF7 ii just fine. It didnt take long to notice a difference either and I dont mean over powering bass. It blended perfectly. We popped in a movie and I noticed a difference right away. Then played some music on the Oppo via USB and the moment I played a song I was very familiar with, it was great. This sub has opened my mids and is exactly what I was missing and never had with my Sub 12. Thank you again Carl, it wouldve taken me all day to figure out how to hook it up and a lot of phone calls to you. I have never had a setup like this and thankful you took the time to teach me. I'm just so used to a sub with a plate amp and this one aint quite like that. It even passed the WAF factor. Edit: The pic is blurry, I had to resize it. Said file was too big on initial attempt. Edited March 29, 2015 by mxr dad 5 Quote Link to comment Share on other sites More sharing options...
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