Originally Posted by Elihawk
Dennis, so just so I am clear...to do the Monoprice mini tower upgrade you need:
1. A design for the modified crossover, from you (I hope you get some thing for that)
2. A parts list for the new crossover
3. The monoprice speakers
Not sure these are going to be better than my EMPtek impression speakers, which have served me well as HT speakers. Would a similar upgrade help with the bookshelf version of these speakers?
Originally Posted by PhilharmonicDennis
I have a write-up that shows the circuits and parts list with links. That's free. The speakers aren't, unless Monprice has switched to my business model. I'm sure the EMPtek's have much higher quality drivers and build quality, and a decent crossover, so I'm not suggesting that you replace those with the Mono's. It's more of a fun project for applications where you don't already have respectable speakers running.
It was fun indeed. I finished mine last night. Thanks to
for sharing his design and to
for answering some questions earlier on this thread. I've attached some pictures. Hope these help others who want to pursue similar endeavor.
I waited one week before upgrading the crossover to familiarize with the OEM sound. I upgraded one side first to compare the OEM sound to Dennis' version. The new crossovers considerably improved the sound at a slight expense to sensitivity. The peaks at high frequencies were tamed, the mids came out and the mid-bass became tighter. Can't comment on the bass because the speakers inherently don't offer much below 60 Hz. The sound stage is exceptionally good, not expected at this price point. I played different genres and found the speaker's full range performance acceptable except for 1) hip-hop & EDM as these demand bass and 2) heavy metal not due to bass deficiency but because the tweeters cannot handle the complex layering in the same manner the Philharmonic Audio BMRs do.
The reduction in sensitivity is negligible and is nothing to worry about. My test methodology made it more apparent than it should be.
By the way, my room is notorious for bass peaks evidenced by prior REW measurements of reference speakers such as Philharmonic BMR and JBL 306P MK2, which showed emphasized bass in the same room. I attached the REW measurements for information purposes only, not to judge the speakers by how they measure in my room.
Equipment used for REW measurement: MiniDSP-UMIK-1 (USB) => MacbookPro (USB) => Topping D70 (XLR-Out) => Parasound HINT (XLR-In).
EDIT: The last picture is a BEFORE-picture
of the stock wiring. (Dennis asked me to clarify this as that picture misled him to think it was the final wiring with the stock components still attached.)
Edit: Attached updated FR graph.