Advanced Discussion

Maybe this should be stickied... Impedance cannot be measured with a DMM. Only DCR can be measured with a single DMM, and this isn't impedance. There is no such thing as "Impedance Rise". There is an impedance curve, but this both rises and falls..... The system impedance will always be higher than the DCR of the driver under any condition. Many factors affect impedance, the biggest being the enclosure. Until you measure your complete alignment at all frequencies in it's operating range, you have no idea what the impedance is. Impedance changes do not change driver power handling, they change how much current you amplifier puts out at a given voltage.. Nobody owns a .7 …

It's kicking my ass. Who will help me understand it better?

Hi everyone, new guy here. I'm a mechanical engineering student/intern at the moment and have had a passion in audio for nearly a decade now. I took it upon myself to design an enclosure for a pair of Demon 10"s for my civic hatch. I'm pretty happy with the punchiness, but the lower end is lacking pretty significantly and sounds "blown out" or "not really there" instead of "deep". I'm hoping to get some insight on where I went wrong with my design. As you can see, this is a non-traditional enclosure where the port effectively shares 4 walls with the enclosure on the outer sides. The design was done this way to maintain a specific outer dimension that fits like a glove in …

I went ahead and designed some retrofits for a pair of Bazooka wakeboard tower speakers. The crossover took some time but came out decent in the end...

Hey guys I remember years back, when we wanted to build a "premium" subwoofer enclosure we would use birch plywood rather than particale board. Back in the late 1980s and early 1990s we mostly used particle board, not MDF, at least not at the shops I worked at. I don't know if it was because MDF wasn't widely available, or if it was more expensive, or if we just didn't know about it. So, my question is: What are your thoughts on using birch plywood for a subwooder enclosure? How do you think the enclosure would handle flex and can you comment about its tonal qualities? What brought this question to my mind is that MDF really is not a great material for holding fasteners (…

I found this pretty relevant and interesting audiopulse`s site... enjoy SUBWOOFER MYTHS # 1 Subwoofers have an RMS rating Speakers actually have a very complex thermal compression relationship and certainly can not be quantified by just one or two numbers typically called RMS and Program or Peak. Because voice coils in traditional drivers are inherently resistors, any amount of voltage generates some amount of heat which then adversely changes the resistance and properties of the speaker. This is the principle of thermal compression: As the voice coil heats up, the resistance changes and the efficiency and performance of the driver decrease until the point of maxim…

Howdy all. I've got a little time on my hands and have a couple of widgets at my disposal. I'm running Stevens Audio Full Body horns in my ride and have a few compression drivers to try out. The compression drivers I've collected so far are the Stevens Audio Pro Drive, Dayton Audio D250P-8, and the DIY Sound Group DNA-360. I've head them here and there, but not long enough to decide which are the best for me. I've got one of those Dayton Audio DATS thingies, so I decided to test out my compression drivers and see what the impedance curve looks like with and without the horn body. I figure I'd share them and spur some discussion on how important the impedance curve is rega…

I thought I’d share this here. The writer goes through great length to explain the why’s and how’s of time alignment in a stereo system. He explains comb filtering, phase issues and alignment, crossover settings and so forth. Plus he does it in a manner that pretty much anyone with just a little bit of background or experience on the subject can understand. http://www.audiofrog.com/community/tech-tips/time-alignment-part-one/ http://www.audiofrog.com/community/tech-tips/time-alignment-part-2/ http://www.audiofrog.com/community/tech-tips/time-alignment-part-three-delays-and-crossovers-for-tweeters-and-mids/ http://www.audiofrog.com/community/tec…

This topic is to discuss test box alignments and tuning for a 6.5"-7" midbass. I am planning on testing quite a few mids in different alignments. MY GOAL IS TO achieve tight accurate dynamic midbass down to 63Hz, with overhead in the output. I am after a very open natural crystal clear sound. I am NOT after punchy colored thick sluggish midbass. My current set up is the Seas U18 in an IB (deadened doors). They are crossed @63hz 24db slope presently. I am running two 15" Icons sealed, crossed @50hz 24db slope. The U in its current alignment handles these frequencys, but has what I believe to be cone edge resonance once at reference level. Plus has no overhead…

I am looking to use my laptop in cars to do RTA measurements and perhaps FFT later on as i play around with things. From what i have been reading the phantom power is required for many of these XLR connections. I have seen some battery operated flat response mics but the price jumps quite a bit. i am intending to buy the trueRTA application and perhaps the LEAP software or some derivative there of. I am looking for some guidance on what microphone and accompaning hardware is needed to accomplish this. am i able to use my onboard sound card or should i buy a USB card with higher performance. anyone ever used a PC for this type of work and have a…

I dont compete. My last 3 systems were with the port on the right hand side. But I like the design of the center port and it will also help with loading issues. Will it sound different with the port being in the center since im used to it being on the right. These are the 2 im looking at heres one heres the one i really liked

Not sure which Batts to do for my setup. planned on replacing the stock Batt. and then adding a second one in the rear. - Amps, Crescendo symphony 1500 & symphony 800.1 - Sub, 1 18" xcon - RF 360.3 - 2014 Jeep Grand cherokee

Anyone who's read through my build log knows I had a set of Bravox CS60K components in there for awhile before going to the FR/MB setup. I tried a lot, and I do mean A LOT of things to get the speakers in the component set to sound right and was never able to succeed. In my pursuit of having all the handier tools at my fingertips to use and play with I have been trying to get a DATS V2 from PE for most of the summer and it was finally back in stock this past weekend so I finally got it ordered. It showed up yesterday and to play around with it I connected one of the old midwoofers from the Bravox components just to give it a shot. I got a weird result on the numbers …

So i've been searching a few different places, but I don't THINK im finding the answer I need ... The question is this(I've been pondering about it for a while) ... If you have a mono channel amplifer, and have 2 DVC subwoofers(wired how you need) .. how much does the amplifier send to each woofer? how do you go about figuring this out? If you have 2 subwoofers rated for 500RMS and a MONO Amplifier for 1000 watts RMS, how do you know each sub is getting 500 watts ? How does the amplifier split up the power(I guess)?

looking for a box design to fit behind seat of s10 that is the right cubic feet for a sundown sa8 top of box can be 5 inches deep and bottom can be 7 inches deep anyone got any designs ?looking for sealed

Your site bitpusher has malware? Congress up on many of my checkers... Just a heads up Love the site and wanted to make sure it stays working well

This isn't exactly a question I have, but here goes. My friend is a big physics geek and on the topic of speakers, he asked why we don't have cooling devices to keep operating temperatures low so resistance is more predictable, and less influential. I Don't really know how to answer him, could some of you throw me some ideas why it isn't a practical idea? My only thoughts on it are practicality regarding a mobile environment and the equipment needed, as well as cost. But why don't filhy rich folks use woofer coolers to take advantage of their amps? I'm interested to see what gets said here It seems cool in theory (no pun intended) Just really impractical.

i made a comment on a post on facebook, and tony d'amore said he would be happy to come to SSA and talk about the amp dyno , he actually told me there would be no debate because its science , so here is the topic. where he and we may discuss .. i mean .. talk about science

Not sure if this is the right section but... I couldn't find any info searching on the topic. When doing a SQ system, is something like this graph followed? Or would it make sense to setup your system to follow the graph, and adjust your EQ accordingly to how the sensitivity of the ear is for a more balanced sound? My only thought I guess is that music isn't all recorded the same, so I guess maybe this wouldn't be useful. Just a thought I had

I need to replace four of these, but cannot figure out the vales to find the part. Help?

I'm working on a project for a buddy of mine and I've come across a bit of a hold up. I'm more than familiar enough with circuit design, crossover components and such to build crossovers. I've been doing it for quite a few years with results that I felt were what I needed. I've come across something different with this as my buddies tweeter is significantly louder than the midrange or the woofer in his 3 way floor standing speakers. The speakers haven't been used in several years and when we hooked them up to test and tune the system for his mom's upcoming birthday party that we were going to DJ ourselves the old tweeters didn't work. Instead of waiting for me to hel…

I am not running all of these at once, but I have the option of choosing any combination. I am running 2 vifa Vifa BC25SC06-04 and 2 DDC6.5"s I have a sony xm-4045, 4040 and 6020. I have a cache cloc'd, pac SNI-35, pac sni-15 and fierce FILC20V2 I just picked up an american bass ABX-3.1A crossover which I will be using to replace an older optimus 3 way crossover, and I will be using it for the mids and tweeters. I will level match (to my liking, which will leave the tweeters a little brighter than the mids) on the crossover. My question on that is what the output knob does. It doesn't show any db so I'm guessing that with the knob maxed out, it's simple not…

So within a few months I will be getting the '13 Fusion and I want to do an active setup. I really don't know much about the speaker choices, best crossover points, processing so I'm relying on you guys to help me get a good front stage. Right now I want to start planning; don't want to rush it when the time comes. So what will I need? amp, speakers (2 6.5 mids and 2 tweeters), minidsp? I will keep the stock hu and use a LC2i. My budget as of right now is undetermined as I want to see prices of everything then see what I should spend. My goals really are simple. I want it to be loud enough to hear vocals over the bass when the subs are high and I want the mid bass t…

Just been wondering why there is no love for them here??? Lol havent had any of their products they seem to be good and at a very good price but the curiosity is killing me at this point and decided to make this question here, wondering is there a dark history of why it seems like they arent very welcomed here in this forum???