Hello,
I run 825s, 515Bs, and 802Ds like you. Got my 825s for free, last December. The drivers I got for free, two years ago, from audiophiles in Kansas City I had audio and triode amp- mentored in previous years.
Find a port suggestion, many here will give you good input, use it, and proceed in this order :
The first thing I suggest is to stabilize the stock 5/8ths thick 825 box,
I suggest you do as I did, and put NO BRACING inside. The cheapest, easiest way to stabilize the 825 box,
AND KEEP IT STOCK, is to add mass loading.
We have a large hardware chain in the USA named Lowes, and in their Garden Center, they have " concrete patio tiles ", which are about 11 1/2 inch square and roughly 1 3/4s inch thick. Each weighs about 17 pounds, cost about $1.48 a tile. I added about 300 pounds of these tiles to each enclosure, on top, mostly at the rear, and the AMOUNT of weight was selected by MY ear, till I was satisfied. Total cost, maybe $75, and it is REVERSIBLE. Do this first. Tiles come red and gray, I chose reddish ones.
The second thing I would do is optimally wire the
amp to crossover, the crossover itself, and the crossover to the drivers with FAR better ( heavier in most cases ) wiring, to improve your system's transfer efficiency. See details of what I did, wiring wise, in my post in this thread :
URL :
See my post #8, regarding decent wiring, in this URL : ..
Proposed Parts List for Model 19 Crossover
The 800HZ 12 dB crossover is what I prefer ( A7-800 ) over the 500 HZ frequency. But the third thing "I" would like to suggest is you re-do the crossover with FAR better caps, better wiring, and maybe better inductors. One cap that NEEDED to be in " my " crossover for the VOTTs to display magic pleasing to me, was a DynamiCap 4.0 uF E series, in all four positions, as part of a "bypass" to an other special high-current, uber low ESR cap I used to get the 8.62 uF Butterworth / 16 Ohm crossover cap value. I will be happy to share the cap specifics privately.
After you do all three suggestions FIRST, you can play with port size. NO rush. The correct size YOU and YOU ALONE select by ear. Its a function of many factors, but YOU alone can decide that by listening.
If you have any questions, or need help, email me as I check that often
[email protected]
What sotra nice amp you going to use on them.??
Since April, I have been working on a SET DC coupled Type 45 amp, 1.5 Watts or so, and whatever I did in the amp-build, was heard, LOUD AND CLEAR - on the speakers. Suggest a two stage 2A3 amp, DC coupled, as a good design. I can help you, if you DIY, with that.
Consider these three suggestions, then YOU need to choose the port size for your system, by your ear !!!
Have fun, I am.
Jeff Medwin Low Ohms
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