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hello all new guy here i have fallowed this forum for years there is a lot of good advice here so i figured i would join sense i need some advice on a sub build . i have a pare of alpine swr 1542 D subs i want to use one to build a sub for my basement i have an amp all i need is a good starting point for a ported enclosure that will work well for theater . like box volume port diameter and length. any advice would be greatly appreciated
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Not seeing any T/S parameters on their site.. Would be difficult without those
You could always just do a sealed enclosure and maybe some equalization. -
alpine-usa.com/products/documents/OM_SWR-1242D.PDFComment
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sorry thats the wrong oneComment
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if you google SWR-1542D type-R manual you can get a pdf. strange that its not on there site anymore..thanks for the quick replyComment
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it is currently in a 2.9 q ft L port box tuned to around 29Hz and it sounds ok . but i know it can sound alot better in a proper enclosure built for theaterComment
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i think this should help . this is the manual that came with the subs .alpine does still have it just took a little digging .. http://vault.alpine-usa.com/products..._SWR-1242D.PDFComment
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If you are serious about this hobby, its time to learn the simple tools of the trade. Go to http://www.linearteam.dk and try the on line box and vent calculators. In about five minutes I came up with a 5 cu.ft. box tuned to 20 hz with a 6" X 34" vent. You need a six inch vent for a 15" woofer.
-BobComment
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Thank you for the advice Bob It is much appreciated. That is very close to what I had come up with . I have been experimenting with these tools for a little while Just wanted some advice from someone with experience in home theater subwoofers Im use to building boxes for cars. Just wanted to make sure I am on the right track
LorenComment
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Box will be 48 inches long 18 inches high And 16 inches deep. Port will be 6 inches x 34 inches in length Flared On both ends. This enclosure will be setting directly under My lcd The sub will be in the center facing the viewing area. What would be the best placement for the port internally an external. Or can I just put it where is most convenient. I just can't seem to find a good answer on the web .. Any opinions would be greatly appreciated... ThanksComment
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It doesn't matter just so long as the opening exits into free air. You don't want it facing a wall or shooting down at the floor unless you allow at least its diameter from the nearest surface. Its probably best to allow a bit more than one diameter just to be safe. You can use a long elbow on the pipe if you need to in order to get it to fit in the box. Don't forget to allow for the space taken up by the vent in your volume calculation. The 5 cu.ft. has to be in addition to the space taken up by the driver and the vent. Line the inside of the box with two or three inches of open cell foam or fiberglass. You don't have to compensate for the volume of the lining since its 99% air.
-BobComment
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i will figure the port/driver/bracing volumes and hopefully get it built this weekend . going to try to make some flared ports out of pvc sense i have some 6" black sch40 . i was very impressed with 2 of these in my yukon they move a lot of air so hopefully this will be a good 2nd life for them . thanks again for the help BobComment
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I'd bet the AS-15 box would be stellar for this one.Comment
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I'm open to all suggestions where can I find some information About The AS-15Comment
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No problem. Glad I could help. Send pictures.
-BobComment
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the AS-15 box is very nice if i had more room it would work but the depth would be an issue for my current setup . lots of upgrades in the near future though "media centers gotta go" so this will be a good project for summer time.i put one of the 1542s in the living room last nite in the L port box tuned to 29 Hz i built for the yukon "couldn't help my self " running on a plate amp out of a infinity PS212 and WOW . it felt like the transformers were in the house . i cant wait to get it in a good box. thanks again for the help and i will definitely post some pics
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I need a little more advice.would putting 2 90 degree elbows in the port tube affect port performance? . I need to do this in order to put the flare inside the box into clean air.Comment
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I need some recommendations for an amplifier I am considering the EP4000 Or The Dayton SA1000. My budget Is 400 dollars Give or take. I have been trying to decide for 2 weeks I have looked at probably 20 different amplifiers. But would appreciate if someone with experience With these products could help me make the right Decision As I have no experience with any of these aftermarket products. I will try to get some pictures up In the next few weeks. And thanks again guys for all the help.Comment
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I just noticed That the behringer epx 3000 amplifier accepts rca inputs this would greatly simplify things and save me 100 dollars by not having to buy adapters and new cables does anyone have an opinion on this amplifier.Last edited by alteredbeast77; 02 May 2011, 18:38 Monday.Comment
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OT - alteredbeast77 I played that game yesterday (altered beast that is)Comment
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anyone ?Comment
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Should be fine, although you'll need some style of a crossover - either on an AV receiver or external.
If you use a plate amp it will have a crossover built in, although if you're using an AV receiver you won't need it anyway.Comment
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Adapters and new cables shouldn't cost you anywhere near 100 dollars, you can get XLR to RCA cables without the need of an adapter.Comment
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I am using a onkyo 7.1 avr I was thinking about just putting a y splitter on the LFE Output Of the receiver And run that to both channels of the epx3000 . I assume this would work fine . but I have heard of a lot of people having ground issues so I'm wondering would it be better to use the XLR to rca cable .Comment
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XLR to RCA cable isn't going to help you with ground issues. There really shouldn't be an issue using the Y cable.Comment
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PE Must be reading my posts I was Just getting ready to order the amp and the price went up 50 dollars From last night.Comment
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My bad disregard that last post. The price did not go up I had the epx 3000 confused with the epx 2000Comment
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That should be fine. Grounding problems are often due to poor installation (poor design notwithstanding), so I wouldn't worry about it unless you experience issues with it
Should be interesting, looking forward to some pictures!Comment
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I ordered the behringer epx 2000 today 349$ + s&h
. I don't have any pictures to post yet but I can give some idea of what I am getting into. the box will be 48 inches wide x 18 inches tall and 19 inches deep. all panels will be 1.5 inches thick except the front panel which will be 2.25 inches thick with very heavy bracing throughout port will be 6 inches in diameter x 34 to 35 inches in length . the depth of the box may change a little bit depending on the bracing volume won't know until I get to that point. overall the box will be over 300 pounds when complete not sure how well my floor is going to like 6 spikes being buried in it but oh well. thanks again for the patience and the advice and wish me luck :lol:
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I thought I had a problem with the new amplifier Turns out the amp is fine I figured out it is a voltage issue Between my receiver And the amplifier. Will something like the ART CLEANBoxPro Solve my problem without any impact on sound quality Or would something like the behringer DSP1124P Feedback destroyer Pro Do the same thing With the added benefit Of a eq.Comment
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Some cheaper receivers don't put out a strong enough signal for a pro amp. The ART CleanBox is generally what is used to fix these issues.Comment
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my problem is my subwoofer LFE Output does not Give the amplifier enough to work with. Output from the amplifier to the subwoofer Is very low Like maybe 10 watts if I had to guess. I was not aware of this issue until I ran across a thread on another forum about this very problem with older onkyo receivers. and I have also read that the cleanbox does not like to go 35hz which is really what my question is about. the manufacturer states 20 hz so most people change out 2 capacitors to allow it to go down to 10hz . I am going to go ahead and order the clean box pro and the new caps to use if I need them. if I am going about this the wrong way please let me know. and I also have 1 other question about what is the best way to wire this up . this is what I am thinking LFE to y spliter to RCA clean box input. XLR Output from clean box to XLR Input of amplifier. Is this correct I just want the Cleanest signal possible With this setup. Sorry for such a long post Thanks again for the help guys I really appreciate it
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Are the XLR Cables I need to use Between the clean box pro And the amplifier The same as a standard microphone cable .That's all I'm finding on parts express ?Comment
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Does your Onkyo have any way to adjust the signal power of the various channels? Not sure which AVR you have but alot of times you can just boost the subwoofer signal on your AVR and it will send a strong enough signal to a pro amp to work nicely without needing the cleanbox.Comment
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i have a onkyo HT-R540. i turned all 7 channels to -15 and sub LFE out to +15 normally it is +2 with any other sub i have and output is strong enough that gain needs to be at 50-75% and no more on the sub or it will bottom the subwoofer out. i also put my main speakers on it with the same result . very little output. sounds clean but no volume to speak of .the same alpine subwoofer powered by my infinity amp 0nly 400W RMS will take pictures off of the walls with no problem. so ordered the cleanbox pro and all the cables i could ever need from PartsExpress and i will see if that is the broblem or if the amp is just bad.Comment
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It is possible you will need a cleanbox to boost with that older receiver if you have tried cranking up the signal already. Another thing to check, which you probably have already checked multiple times, is the settings on the back of the amp. Make sure all of the proper ones are enabled and the correct ones are disabled.Comment
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Try it with the sub set to 0dB on the receiver and upping the gain on the power amp. It might be clipping on the input stage of the Behringer amp?
Edit: Ignore that I misread the post - thought you were getting distortion not low output.
Also, what is the impedance of the load you're driving?
IIRC car audio stuff is often low impedance (sometimes 1 or 2 ohms), which is going to make the amp have a fit.
It could be something to do with that and triggering some kind of internal protection - try running stereo with one channel driving an 8 ohm load.
What's the purpose of the cleanbox? Looks like a little gain stage and a balanced/unbalanced converter?Comment
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yes i have checked the settings over and over i have checked everything 100 times. the subwoofer has dual 4ohm voice coils . i have tried it with a 4ohm load on one coil and 8ohm load with both coils . it sounds the same either way .i have also tried one channel in stereo @ 8ohm with the same result. the reason for the cleanbox pro is that it will take my week unbalanced signal from the onkyo and convert it to a balanced pro sound level signal much stronger than most AVR's can produce (per my local prosound dealer/audio engineer) . and from my research over the past few days this is a very common problem with this mix of home and pro sound equipment even with high end AVR's .i have 18 years in mobile audio so i can understand this problem. most good in dash receivers will feed a amp a 5-8 volt signal and most good class D amps need at least that to hit there advertized rating . cut that signal in half and you cut the amps out put in half. i would link my findings about this but i don't know if its allowed i don't want to break any forum rules . i know a lot of members here use these amps has anyone tested the output of the amp when running directly from a AVR LFE . the reason i picked this amp (EPX2000) is because it is very similar to good mobile amps that use accelerated transient response technology. the parts will be here on tuesday we will see how it works .thanks again and thanks to parts express. :T. if i have this wrong please school me i can take it 8)
Last edited by alteredbeast77; 06 May 2011, 13:17 Friday.Comment
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i had some rca-xlr cables made yesterday and they did make a noticeable difference in volume over the rca-rca connection but just as the sub starts to sound good it starts clipping :cry: .but i do have the gain all the way up on the amp and the LFE set to its highest setting . so i think the cleanbox will do the trick. would someone check me on this -crossover off set to full range / bridged /limiter off. and is it normal for the signal limit LED's to lite up when power is turned on and off ? i assume this is some sort of self test but nothing in the manual about it
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update...the ART cleanbox pro works. onkyo LFE output set to 0 cleanbox set to 50% gain and the EPX2000 gain set to the 12oclock position seem to yield the best results . bridged at 4Ohm it makes more than enough power to push the sub to it's mechanical limit with a bass heavy track . BUT than i started watching a blueray movie transformers 2 and noticed that something just did not sound right something was missing so i hocked the infinity subwoofer amp back up to it and it was obvious . don't know if it's the cleanbox or the epx or a combination of the two but all of the low frequency sound is gone :cry: i checked all settings and connections multiple times it is all correct . so back to square one amp will be returned today... does anyone have experience with the dayton SA1000 rack mount amp ? or any other amp in this price range and power range. no pro amps. PLEASE HELP THE NEWB ;x(Comment
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Someone already mentioned to you that the cleanbox would have to be modded so it will play down lower.Comment
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Or you mentioned it I see, anyways you do have to swap a couple components to get the lower frequencies, the clean box cuts everything below 20hz stock I believe.Comment
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yes I did mention it but that was for the original cleanbox not the cleanbox pro. I found threads on a couple of other forums saying that the cleanbox pro did not have this problem when running from unbalanced rca to balanced xlr. there test results show it is good down to 10hz in this configuration only. any other configuration cuts it at 20hz. bad advice I guess I will steer clear of that other place from here on out. its filtering well above 20 hz or the amp is just falling on its face. so I think I'm going to just stick with a good old fashioned subwoofer amplifier. they are designed to do 1 thing and they do it well. I am planning on ordering the dayton 1000 watt rack mount amplifier. I was just wondering if anyone else has any experience with this particular amplifier. is it worth the money ? because I really like the idea of having an eq built in . thanks again link to the cleanbox mod i mention http://www.subwoofer-builder.com/cleanbox/cleanbox.htm
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