BillFitzmaurice.info

I know, I'm interested in the technical differences about those 2 drivers when installed in the THT.

I am actually after the possibilty to flatten the frequency response a little bit better. EQ does not help over the different seating positions.

Ok, i just thought that the longer xmax was prefered in this case

Thanks for your quick reply.

What to expect from Premium driver UM15-22 vs RSS390HF-4 15". I´m planning to build a second THTLP and i got some decision anxiety about what driver to go with. Sensitivity ? How much wattage/volt is it safe to power it with ? What does it make it a premium driver (more SPL?) I do know it got m...

Will this work as a PL Premium substitute? :?: https://cromarbuildingproducts.com/wp/wp-content/uploads/2018/08/Cromar-Alpha-Chem-Polyurethane-30-Minute-300ml1.pdf https://www.ebay.co.uk/itm/12-x-ALPHACHEM-POLYURETHANE-WOOD-ADHESIVE-SETS-IN-30-MINUTES-EVO-STIK-PU-GLUE/174079948166?hash=item2887f9358...

Post subject: Re: 36" THT Low Profile, Warning lots of coffin pictures Reply with quote Good job. You sure smoothed it out. Some times you may find that an RCA crossover like Harrison Labs 100 Hz or 140 Hz low pass filter x2 will take out some flappyness. If the horn is doing overtime by worki...

How far is the mic from the THT?

About 320cm

Bill Fitzmaurice wrote:

Tom Smit wrote:That dip at ~82 hz, is it due to mic location?

Probably, it indicates a 3.4 foot distance from either the mic or the speaker to a boundary.

Mic (UMIK-1) was at listening position about 40cm from backwall and THT in front corner standing up shooting into celing about 65,5cm from ceiling.

Some follow up measurements with EQ.

shawn_g wrote:That last chart looks great. I need to build one of these sometime soon.

I can really recomend building one

ok, some more measurement sweeps at listening position. 10-150hz, scale 50-100dB (2dB between each line) no smoothing. https://dl.dropboxusercontent.com/u/86334034/bfm/mindre/1%20no%20eq.jpg And with basstraps... It evens the dip at 50hz and takes down 55hz peak. https://dl.dropboxusercontent.com/u/...

My experience so far...

It sounds great , a whole new dimension.... So much power and dynamic.
Control and detail, my old subs sounds weak comparing to this.

Tomorrow i will try some parametric eq.

Thanks got confused Indoor/outdoor


10-150hz sweep, mic @ listening position and horn cornerloaded

OK... Its huge and space is tight

Let's see how it ends...

With mouth 18" from wall facing wall or mouth facing along the wall?