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Jim told me the crossover design was not his own and after I found this issue he said he was discontinuing the product. Perhaps he has a redesign now. I have no way of knowing. I tried to review 2 pairs of speakers from Salk and both pairs had issues and there is no room in my schedule at...

I apologize for not seeing "Salk" in the filename of that graph. I thought I deleted all references to brand in that measurement. I have just fixed the graph so it no longer shows a name. The speaker in question did in fact measure that way. I measured both speakers so it wasn't a simple...

Guys, as promised, we just published what is likely the most detailed look at cabinet bracing ever done by any publication or loudspeaker company for that matter. David Waratuke is a Structural Engineer that designs buildings for a living. He used Finite Element Analysis and heavy math to take...

Crap I replaced the trace with "Sweep" but didn't see it where the filename called it out. I will change out the image. It wasn't my intent to give Salk a black eye, especially since they no longer make that speaker. [edit] I fixed the image and my apologies to Salk.

I didn't want to mention names but the speaker in question is no longer in production after I took a look at it and found the impedance issue. I measured both speakers and they both measured the same so it was likely a design issue. The speakers sounded very good but they just couldn't play...

The Scan Speak 9500 has one of the lowest resonance frequencies I've seen in a tweeter (around 600Hz I believe) and yet nobody I know of uses a first order filter on it. But if that is B&W's claim then so be it. It's weird that I see no resistor pad down on their tweet in the schematic. I need...

It also needs to be conducted by a panel of listeners NOT without familiarity bias. The listeners should be able to repeat these listening sessions over a course of several days to see how their opinions change over time. Seriously how crazy do we really have to get with listening tests. Any...

Harman is right on the money with this! I don't buy into "we use 1st order networks or NO network at all to yield better phase response, or keep in the magic pixie dust to better preserve the fidelity :) That being said, you can use lower than 4th order networks if the drivers are robust...

Without seeing the schematic, the 1st example looks like 2nd order networks to me. Each driver has an LC element connected in the crossover though I may be mistaken. Some companies will claim to use 1st order networks but upon closer inspection they are often higher order or most complex...

Very true on all accounts! I proposed to EMP a business model like Build a Bear where you can customize your speaker by choosing a series of upgrade options in drivers, crossovers, etc. You then get a speaker with a birth certificate with measurements and a statement they were custom built...

I meant dull in the context of comparing a tonally neutral speaker to a bright one. I have heard many speakers over the years that have an elevated top end that at first listen appear to sound more revealing but overtime very fatiguing and unnatural sounding.

The bottom line is you have to spend a good amount of time with a speaker to ultimately determine if you like how it sounds. A bright/bassy speaker will initially sound better than a neutral speaker in short sighted or blind tests. Try living with a bright speaker over a course of a few...

Power response is typically done anechoic in 10-15deg increments spherically around the speaker. The averaged results are then weighted according to the proportional area of the sphere represented by each measurement. There is a really good article on this I’d love to attach but I haven’t...

I agree. Also just how much sidewall reflection do you really want? It is definitely a balancing act. It's funny. Years ago when I was setting up my theater system in my family room, (long before Toole's book came out), I decided to put absorption on the sidewalls b/c classically that was...

Emotiva takes its time to design quality crossovers that don't display any nasty low impedance dips and they employ good parts and layout. Vance Dickinson does their crossover work and he is considered a legend in the field.

Sidewall reflections are beneficial NOT detrimental. I agree most people stick their couches against the backwall which is bad for smooth bass response and a realistic surround field.

Early reflections dominate in small rooms as per Dr. Floyd Toole's extensive research. Of course a speaker exhibiting a smooth and even power response will also likely produce good early reflections since its off axis response is consistent.

DS-21; I had Floyd Toole look over this thread personally and here is what he had to say: As you can see, you are not properly presenting and interpreting his research. SFM is a tool to help open up more placement flexibility but it doesn't negate proper positioning of the subs in the room...

I installed this EMP sub for a friend in his bedroom system using a pair of EMP e55Ti towers. The combo produced excellent results with plenty of deep and tight bass for music. It's a great deal. Merry XMAS to you!

DS-21; If you have Dr. Floyd Toole's book "Sound Reproduction", I suggest you read Chapter 13. This chapter is very clear about optimal positioning of subs in a room to smooth out bass response. As far as my understanding of ARCOS & SFM, the system will actually measure the room and suggest...